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ADF4112BRU - 3 GHz Integer-N PLL | Analog Devices
Analog Devices ADF4112BRU is an integer-N phase-locked loop frequency synthesizer rated to 3.0 GHz, supplied in a 16-lead TSSOP package. It combines a low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, programmable A and B counters, and a dual-modulus prescaler. The device supports a 5.5 V power supply and a separate charge-pump supply, making it suitable for RF local-oscillator and clock-generation systems that require programmable frequency synthesis. A PLL frequency synthesizer is a clock-and-timing integrated circuit that locks an output oscillator to a stable reference frequency. Within the power-management and signal-chain hierarchy, the ADF4112 belongs to the frequency-synthesizer class, where the phase detector, charge pump, counters, prescaler, and voltage-controlled oscillator work as a closed feedback loop. Its integer-N architecture simplifies programming because the feedback division ratio is formed from integer counters rather than a fractional divider. The verified product information identifies a 3 GHz maximum PLL operating frequency, a 5.5 V supply, a separate charge-pump supply, programmable reference and counter functions, and programmable charge-pump currents. The 16-TSSOP package provides a compact surface-mount footprint suitable for RF boards, instrumentation, communications equipment, and test-and-measurement systems. The manufacturer product page lists the part as production and provides a starting list price of $3.55. In operation, the reference signal passes through the programmable reference divider, while the feedback path uses the prescaler and A/B counters. The phase-frequency detector compares the divided reference and feedback signals, and the charge pump converts the phase error into a tuning voltage for the external voltage-controlled oscillator. A separate charge-pump supply permits extended tuning voltage, while programmable current helps tune loop dynamics. Typical applications include wireless receiver and transmitter local oscillators, RF upconversion and downconversion stages, instrumentation, and communications test equipment. Because the target is an integer-N device, designs needing fractional-N synthesis may require a different part. This page combines verified manufacturer and distributor information with practical configuration guidance, helping engineers distinguish function from package and evaluate replacement constraints. Designers should verify the complete datasheet for counter widths, prescaler options, reference-input limits, output-driver configuration, loop-filter requirements, and exposed thermal behavior before layout. The reference and feedback paths require careful RF routing, while the charge-pump and loop-filter components must be placed close to the relevant pins to minimize noise and phase error. Pricing shown in this record reflects the manufacturer listing available as of 2026-10-23.
ADF4113BCP - 4GHz Integer-N PLL | Analog Devices
The Analog Devices ADF4113BCP is a single integer-N phase-locked-loop frequency synthesizer with a 4.0 GHz maximum RF input, programmable dual-modulus prescaler, and programmable charge-pump current, packaged in a 20-lead LFCSP with an exposed pad. It operates from a 2.7 V to 5.5 V supply range and supports a separate charge-pump supply at VP, allowing an extended tuning-voltage range. The device also supports 3 V systems, making it suitable for low-voltage RF and wireless signal chains. A phase-locked loop is a feedback-controlled timing system in which a programmable frequency divider and phase-frequency detector compare a divided reference signal with a divided feedback signal. The charge pump converts phase error into a tuning voltage that controls a voltage-controlled oscillator. The ADF4113 belongs to the broader frequency-synthesizer hierarchy, where PLL means phase-locked loop and integer-N describes synthesis through integer prescaler and feedback-counter division. Key features include the 4.0 GHz RF input limit, programmable prescaler, selectable charge-pump currents, and a separate VP supply for greater tuning-voltage headroom. Its integer-N architecture simplifies programming compared with fractional-N synthesizers because the feedback division ratio is an integer. The 20-lead surface-mount package supports compact RF designs, while the exposed pad provides a thermal and electrical connection to the PCB. The internal architecture combines a low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, programmable A and B counters, and a dual-modulus P/P+1 prescaler. The A and B counters determine the feedback division ratio, while the prescaler divides the RF feedback signal before it reaches the phase-frequency detector. This arrangement supports integer-N local-oscillator generation for wireless receivers and transmitters. Typical uses include GSM and other wireless receiver or transmitter local oscillators, radio-frequency down-conversion and up-conversion stages, RF instrumentation, and communications equipment requiring programmable frequency synthesis. The on-chip reference divider is also useful when the available reference frequency must be divided before comparison with the feedback path. The supplied family documentation specifically identifies wireless up-conversion and down-conversion local oscillators as principal applications. Designers should preserve the exposed-pad thermal path and keep RF, reference, and charge-pump routing compact. The separate VP connection can increase tuning-voltage headroom, but it must be connected according to the manufacturer’s recommended application circuit. Input, reference, and feedback layout quality directly affects phase noise and lock behavior, so controlled-impedance routing and short high-frequency paths are important. This product page combines verified manufacturer specifications, distributor availability and pricing references, package information, and a strict assessment of drop-in alternatives. It also distinguishes electrically compatible devices from lower-frequency family members that cannot replace the ADF4113BCP across its full operating range.
ADF4113BRU - 4 GHz Integer-N RF PLL | Analog Devices
The Analog Devices ADF4113BRU is a single integer-N RF frequency synthesizer with a 4.0 GHz maximum operating frequency, programmable prescaler and charge pump, and a 16-pin TSSOP package. The device combines a low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, programmable A and B counters, and a dual-modulus prescaler for local-oscillator generation in wireless receivers and transmitters. Its programmable architecture lets designers divide down a stable reference source and synthesize the required carrier frequency while controlling channel spacing through the reference divider, counters, and prescaler settings. An integer-N PLL is a frequency-synthesizer category in which the feedback prescaler and integer counters establish the output frequency while the phase-frequency detector and charge-pump network close the loop around a voltage-controlled oscillator. The ADF4110 family therefore belongs to the broader hierarchy of clock and timing ICs, frequency synthesizers, phase-locked loops, RF signal-chain ICs, and semiconductors. Integer-N operation simplifies control compared with fractional-N architectures, while the maximum RF input rate enables high-frequency local-oscillator designs when the VCO and loop bandwidth are suitable. The ADF4113BRU supports RF synthesis up to 4.0 GHz and includes programmable dual-modulus prescaling, programmable charge-pump currents, a separate charge-pump supply, and a programmable reference divider. The family documentation also identifies 3 V system operation. Separate charge-pump supply capability allows extended tuning-voltage headroom, which is useful when the external VCO requires a tuning range beyond the main supply rail. The programmable charge-pump current provides another control point for loop dynamics and reference-spur trade-offs. The internal signal path uses a low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, A and B counters, and P/P+1 dual-modulus prescaler. This arrangement is intended for integer-N local oscillators in RF upconversion and downconversion paths. The 16-TSSOP body is 4.40 mm wide and corresponds to the 0.173-inch package description listed by DigiKey. Package, lead finish, and orderable suffix must be checked against the Analog Devices ordering guide before substituting an alternative. Typical uses include GSM and other wireless receiver or transmitter local oscillators, RF upconversion and downconversion blocks, communications test equipment, and frequency-generation subsystems. In such systems, the reference divider can reduce a high-frequency reference before comparison with the divided VCO output. The A counter, B counter, and dual-modulus prescaler determine the integer multiplication relationship, while the charge pump and external loop filter translate phase error into VCO tuning voltage. The principal design constraint is loop stability. Component values for the charge-pump, loop filter, and VCO must be derived for the actual reference frequency, target output frequency, prescaler, phase margin, and tuning range. RF routing also requires short, controlled-impedance paths, solid return planes, and careful separation between sensitive synthesizer inputs and high-energy clock or switching nodes. The ADF4113 datasheet family should be consulted for the complete pin table and application circuit. This product record combines verified manufacturer and distributor information with a focused comparison of same-package options, practical loop-filter and layout guidance, and commercial availability context. It is intended to help engineers confirm footprint, frequency capability, programming architecture, and source-document status before committing a PLL design to layout or production.
ADF4116BRUZ - 550 MHz Integer-N PLL | Analog Devices
The Analog Devices ADF4116BRUZ is a single-channel, integer-N radio-frequency phase-locked loop frequency synthesizer with a maximum output frequency of 550 MHz, supplied in a 16-pin TSSOP package. It combines a low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, programmable A and B counters, and a dual-modulus prescaler for programmable RF clock and local-oscillator generation. An RF PLL frequency synthesizer is a clock-and-timing IC that locks an output phase to a reference frequency. Within the broader semiconductor hierarchy, the ADF4116 belongs to the clock and timing family and supports applications that require stable, programmable RF frequencies for wireless receiver and transmitter signal chains. The ADF4116 operates from a 5.5 V supply and includes a separate charge-pump supply arrangement for extended tuning-voltage capability. It supports 3 V systems, uses an external reference, and provides an external CMOS clock input and clock output. Its architecture permits integer-N frequency planning using the programmable reference divider, A counter, B counter, and dual-modulus prescaler. At an RF output frequency of up to 550 MHz, the device can generate local-oscillator signals for wireless upconversion and downconversion sections. The manufacturer identifies ADF4116, ADF4117, and ADF4118 as a related family with maximum frequencies of 550 MHz, 1.2 GHz, and 3.0 GHz, respectively; the higher-frequency members also support separate tuning-voltage operation. Typical uses include wireless receiver and transmitter local oscillators, RF signal-generation systems, test and measurement equipment, and frequency conversion stages in communications equipment. Designers must select the reference frequency, prescaler, counter values, charge-pump current, and loop-filter components to meet the required output range and phase-noise performance. A key design consideration is loop-filter tuning because it directly affects lock behavior, phase noise, and reference-spur performance. The charge-pump output drives the external loop filter, and the available tuning voltage must remain within both the RF-VCO and ADF4116 charge-pump constraints. This product page consolidates verified manufacturer specifications, distributor pricing, lifecycle information, and same-package replacement analysis. It also distinguishes a documented legacy variant from reel-format order codes so engineers can make a pin-compatible sourcing decision without treating packaging-only variants as separate drop-in alternatives.
ADF4117BRU - 1.2GHz Integer-N RF PLL | Analog Devices
The Analog Devices ADF4117BRU is a 1.2 GHz integer-N radio-frequency phase-locked-loop frequency synthesizer in a 16-pin TSSOP package. It is designed to generate programmable local-oscillator signals for RF upconversion and downconversion in wireless receivers and transmitters. According to the Analog Devices product page, the ADF4117 is in production and the family data sheet is Revision D. A frequency synthesizer is an electronic timing and control component that produces an output frequency derived from a stable reference frequency. An integer-N PLL belongs to the integer-N frequency synthesizer family within clock and timing ICs. Its phase-frequency detector, charge pump, reference divider, A and B counters, and dual-modulus prescaler allow a receiver or transmitter to select an RF output frequency through digital programming. The ADF4117BRU combines an input reference and programmable feedback path in a 1.2 GHz RF PLL. The verified distributor listing identifies the device as a single RF clock/frequency-synthesizer IC with one output in a 16-TSSOP package measuring 4.40 mm wide. The Analog Devices family data sheet describes low-noise digital phase-frequency detection, a precision charge pump, a programmable reference divider, programmable A and B counters, and a dual-modulus P/P+1 prescaler as the principal internal functional blocks. The device is appropriate for RF signal chains requiring a programmable local oscillator. Its 1.2 GHz maximum indicated synthesizer frequency supports wireless receiver and transmitter architectures operating within that range. The integer-N architecture simplifies frequency planning because the prescaler, A counter, and B counter determine the synthesized output relationship to the reference and feedback signals. Typical uses include wireless receiver downconversion, wireless transmitter upconversion, RF communications equipment, and other systems requiring an integrated programmable PLL. The 16-TSSOP package also allows reuse of compact RF board layouts designed for compatible members of the ADF411x family, provided the pin arrangement, frequency range, register behavior, and operating requirements are verified before substitution. When designing around the ADF4117BRU, verify the complete reference and feedback network, counter programming, loop filter, charge-pump settings, and RF output routing against the manufacturer data sheet. Ensure the selected reference frequency and prescaler produce the intended channel-plan relationship without exceeding the device's stated operating limits. This page combines the verified 1.2 GHz and 16-TSSOP identity, manufacturer family architecture, current production indication, distributor pricing reference, and same-package cross-reference information into a design-oriented resource for engineers evaluating the ADF4117BRU.
ADF4118BRU - 3 GHz Integer-N RF PLL | Analog Devices
The Analog Devices ADF4118BRU is a single-channel, integer-N RF phase-locked-loop frequency synthesizer rated to 3.0 GHz and packaged in a 16-pin TSSOP. It is designed for wireless receiver and transmitter local oscillators, where programmable division, frequency synthesis, and phase locking must be combined in one IC. According to the Analog Devices product page, the ADF4118 is currently marked production, and the listed starting price is $2.78 as of the verified distributor search on 2026-10-23. An RF PLL is a clock-and-timing integrated circuit that locks a voltage-controlled oscillator to a stable reference frequency. The ADF4118 family combines a low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, programmable A and B counters, and a dual-modulus prescaler. This hierarchy places it under frequency synthesizers, clock and timing ICs, and semiconductor components used to control RF oscillators. The verified product classification identifies one RF PLL channel, integer-N synthesis, a maximum operating frequency of 3 GHz, and a 16-pin TSSOP package measuring 0.173 inch wide by 4.40 mm. Its programmable architecture supports local-oscillator generation in up-conversion and down-conversion sections of wireless receivers and transmitters. The precision charge-pump output drives an external loop filter, while the divided reference and counter paths establish the target synthesis ratio. The ADF4118 family architecture supports integer-N frequency synthesis by comparing the divided oscillator signal with a divided reference. Designers select divider and counter values, then calculate loop-filter components according to the Analog Devices family datasheet. This architecture is useful when a stable system reference is available and the required local-oscillator frequency must be generated with programmable division. It is not a general-purpose clock generator for applications where the output frequency is fixed and no feedback loop is required. Typical uses include wireless transmitter local oscillators, wireless receiver down-conversion, up-conversion mixers, and other RF signal chains that require synthesized frequencies. The 3 GHz capability is appropriate for RF systems whose local-oscillator requirements fall within the device range. Final suitability depends on reference frequency, prescaler settings, counter limits, loop-filter design, output buffering, and compliance with the manufacturer’s recommended operating conditions. For PCB implementation, keep the charge-pump trace and loop-filter components close to the device, maintain short RF paths, and use a controlled reference signal. The external loop filter is part of the frequency-control system; changing its resistance or capacitance can alter loop dynamics, phase margin, and spur performance. Designers should review the family datasheet and application guidance before fixing component values. This page combines the verified manufacturer classification, distributor package and pricing information, and cross-reference findings with practical selection guidance. It distinguishes confirmed data from specifications that require direct confirmation from the current Analog Devices datasheet, helping engineers identify the correct PLL family and package without confusing similar ADF4110 or ADF4154 devices.
ADF4153BCP - 4 GHz Fractional-N Synthesizer | Analog Devices
The Analog Devices ADF4153BCP is a fractional-N frequency synthesizer covering 500 MHz to 4 GHz, operating from a 3.3 V supply and packaged in a 20-lead LFCSP surface-mount package. It combines a low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, and Sigma-Delta fractional interpolator for programmable fractional-N division. A fractional-N frequency synthesizer is a clock-generation IC that synthesizes an output frequency locked to an external reference while allowing non-integer division ratios. Within the broader semiconductor hierarchy, it is a PLL-based frequency synthesizer, a clock-and-timing IC, and a power-management-adjacent RF timing component used to generate stable local-oscillator signals in receiver and transmitter chains. The ADF4153 supports RF bandwidths from 500 MHz to 4 GHz and includes selectable 4/5 and 8/9 dual-modulus prescalers. Programmable charge-pump currents support loop-filter optimization, while the 3-wire serial interface provides register-based control of synthesis functions. The separate VP connection allows the tuning-voltage supply to be extended, making the device suitable for RF systems requiring elevated VCO tuning voltages. Its architecture uses a low-noise digital phase-frequency detector to compare the divided feedback signal with the divided reference. A precision charge pump drives the loop-filter voltage, while the Sigma-Delta fractional interpolator enables fractional division without changing the external reference frequency. The result is flexible frequency planning for RF transmitters, receivers, instrumentation, and communication equipment. Typical uses include wireless receiver and transmitter local oscillators, upconversion and downconversion chains, RF test equipment, and frequency-generation modules. The fractional-N architecture is particularly useful when the desired channel spacing cannot be obtained conveniently through integer-N division. The 4 GHz upper operating limit supports high-band RF designs, while the 500 MHz lower limit covers cellular, microwave, and test-signal applications. PCB layout is critical because the ADF4153's phase-noise and spur performance depends on isolation between the RF input, VCO, reference, charge-pump output, and sensitive analog supply pins. Keep the VCO away from the reference input to avoid board-level reference-noise feedthrough, and place decoupling and loop-filter components close to their associated pins. This page combines verified Analog Devices product information, distributor pricing, package details, candidate drop-in alternatives, and practical design guidance to support faster component selection, PCB compatibility review, and RF design planning.
ADF4154BCP - 4 GHz Fractional-N Synthesizer | ADI
Analog Devices ADF4154BCP is a fractional-N frequency synthesizer with a 500 MHz to 4 GHz RF bandwidth, a 10 MHz to 4 GHz input-frequency range, and a 3.3 V power supply in a 20-pin LFCSP with exposed-pad package. It is recommended by Analog Devices for new designs and is intended to implement local oscillators in the up-conversion and down-conversion sections of wireless receivers and transmitters. A fractional-N frequency synthesizer belongs to the PLL and clock-and-timing IC hierarchy. Its phase-frequency detector, precision charge pump, programmable reference divider, and sigma-delta fractional interpolator generate an adjustable output frequency while allowing fractional division ratios. This architecture is useful when a system requires fine frequency resolution, rapid programmable tuning, or a compact local oscillator for RF conversion stages. The ADF4154BCP supports programmable dual-modulus prescalers of 4/5 and 8/9, programmable charge-pump currents, and a three-wire serial interface. A separate VP connection permits an extended tuning-voltage range. Digital lock detect provides an observable PLL-lock status, while power-down mode supports low-power operating states. These features make the device applicable to closed-loop RF generation systems where tuning range and lock status must be controlled digitally. Its fractional-N architecture permits the output frequency to be set through integer and fractional division parameters programmed over the serial interface. This differs from a fixed-frequency oscillator because the synthesizer can cover multiple channels within its 500 MHz to 4 GHz RF bandwidth. The programmable prescaler selection and charge-pump setting also give designers control over the relationship between reference frequency, division ratio, and loop-filter behavior. Primary applications include wireless receiver local oscillators, wireless transmitter local oscillators, RF up-conversion and down-conversion paths, and other programmable RF signal-chain systems. The 3.3 V supply reduces the number of supply rails required in many compact RF designs, although external passive filtering and careful PCB layout remain essential for predictable phase-noise and lock performance. Designers should select the reference and loop-filter components to match the intended channel spacing and phase-noise requirements. The three-wire interface requires a controller capable of programming the required register sequence. Ground-plane continuity, exposed-pad soldering, and short RF paths should be verified against the Analog Devices datasheet before production release. This page consolidates the verified manufacturer information, observed distributor price, family alternatives, and application-oriented design guidance available for the ADF4154BCP. It also distinguishes documented specifications from parameters that still require confirmation from the complete manufacturer datasheet.
ADF4154BRU - 4 GHz Fractional-N Synthesizer | Analog Devices
Analog Devices ADF4154BRU is a fractional-N frequency synthesizer covering 500 MHz to 4 GHz, operating from a 2.7 V to 3.3 V power supply and housed in a 16-lead TSSOP package. The device provides programmable 4/5 and 8/9 dual-modulus prescalers, programmable charge-pump currents, a 3-wire serial interface, analog and digital lock detection, and a power-down mode. A separate VP supply supports extended tuning-voltage capability. A fractional-N frequency synthesizer is a phase-locked-loop timing device that synthesizes an accurate output frequency by dividing a reference signal and controlling a programmable dual-modulus prescaler. In the broader semiconductor hierarchy, the ADF4154 belongs to the clock and timing IC family, where it operates as a frequency synthesizer and local oscillator for wireless RF signal chains. The primary features of the ADF4154 address phase-detector tuning, frequency resolution, RF bandwidth, and system control. Its RF bandwidth extends to 4 GHz, while the selectable 4/5 and 8/9 prescalers support multiple feedback-divider arrangements. Programmable charge-pump currents allow the loop bandwidth and reference-spur behavior to be tuned for different reference frequencies and phase-noise requirements. Analog and digital lock detection give the host controller two ways to verify PLL acquisition. Technically, the ADF4154 uses fractional-N division to permit non-integer feedback ratios while retaining a fractional spur. The 3-wire serial interface configures the synthesizer registers, and the separate VP connection allows the tuning-voltage range to exceed what the main supply alone would provide. This architecture is useful when a fixed reference must generate an RF channel with fine frequency resolution. Typical applications include wireless receiver and transmitter local oscillators, up-conversion and down-conversion sections, RF transceiver synthesizers, microwave test equipment, and instrumentation. Its 500 MHz to 4 GHz range is particularly applicable to RF communications equipment operating in the upper UHF, cellular, Wi-Fi, radar, and microwave bands. A critical design consideration is that the reference frequency, prescaler, divider settings, loop filter, charge-pump current, and output frequency must be evaluated together. The loop filter should be calculated for the selected reference and channel spacing, and the RF output network must be impedance-matched to 50 ohms when the application requires standard RF test or measurement equipment. This page combines the verified manufacturer features, package information, pricing reference, pin-compatible family alternatives, comparison parameters, and practical RF design guidance in one engineering-focused resource.
ADF4159CCPZ - 13 GHz Fractional-N PLL Synthesizer | Analog Devices
The Analog Devices ADF4159CCPZ is a 13 GHz fractional-N frequency synthesizer with modulation, fast and slow waveform generation, one CMOS output, and a 24-lead WFQFN exposed-pad package. It uses a 25-bit fixed modulus for subhertz frequency resolution, while its low-noise digital phase-frequency detector operates up to 110 MHz according to the manufacturer datasheet. The device accepts CMOS reference input and is intended for programmable clock, modulation, and waveform-generation systems. A frequency synthesizer is a clock-and-timing semiconductor that locks an output frequency to a stable reference. In the PLL hierarchy, the ADF4159 belongs to the fractional-N synthesizer and phase-locked-loop categories, combining a programmable reference divider, phase detector, charge pump, Sigma-Delta fractional interpolator, feedback dividers, and output drive circuitry. This allows a single device to generate a precisely controlled RF or clock output while retaining fine frequency adjustment. Key verified features include operation to 13 GHz, a 25-bit fixed modulus, direct modulation, fast-ramp waveform generation, and both fast and slow waveform generation. The listed supply conditions include AVDD and VP from 2.7 V to 3.45 V and DVDD and SDVDD at 1.8 V. These features make the synthesizer useful where an adjustable RF clock, modulation source, or test waveform is needed rather than a fixed-frequency oscillator. Technically, the PLL compares the divided feedback signal with the divided reference signal. Its digital PFD and charge pump drive the tuning path, while the Sigma-Delta fractional interpolator permits fine fractional frequency control. The verified data also identifies a 110 MHz PFD frequency. Values such as phase noise, lock time, reference input frequency range, output power, and temperature limits were not supplied and must be verified in the complete manufacturer datasheet before design release. Typical uses include RF and microwave signal generation, communications test equipment, clock modulation, laboratory waveform sources, and closed-loop systems requiring programmable frequency. In these applications, the 13 GHz ceiling provides broad tuning coverage, the fractional-N architecture provides fine resolution, and the waveform functions reduce the need for separate modulation circuitry. A key design consideration is loop-filter and reference implementation. The external loop filter, charge-pump settings, reference divider, feedback dividers, and output matching network must be designed together because they determine loop dynamics and spectral performance. RF routing also requires controlled impedance and careful separation of sensitive feedback and reference paths. This page combines verified manufacturer and distributor facts, a conservative drop-in assessment, package guidance, and engineering-focused comparison and design notes. It distinguishes documented values from missing data so engineers can review the part without relying on unverified specifications.
ADF4169CCPZ - 13.5 GHz Fractional-N Synthesizer | Analog Devices
The Analog Devices ADF4169CCPZ is a 13.5 GHz fractional-N frequency synthesizer with modulation and fast and slow waveform generation capability in a 24-lead LFCSP-WQ surface-mount package. It uses a 25-bit fixed modulus to provide subhertz frequency resolution, while its low-noise digital phase-frequency detector, precision charge pump, and programmable reference divider support precision phase-locked-loop designs. A fractional-N frequency synthesizer is a clock-generation and timing IC that synthesizes an output frequency through a phase-locked loop. Its hierarchy extends from frequency synthesizer to phase-locked loop, clock and timing IC, and power-management-adjacent semiconductor. Unlike a simple integer-N divider, the ADF4169 supports fractional feedback division, allowing precise output-frequency settings without requiring an excessively high reference frequency. The ADF4169CCPZ supports a maximum synthesis frequency of 13.5 GHz and includes both fast and slow waveform generation for modulation. Its 25-bit fixed-modulus fractional architecture provides subhertz frequency resolution. The device also combines a low-noise digital phase-frequency detector and precision charge pump, features intended to support low phase noise and accurate loop operation in demanding RF signal chains. The device is suitable for frequency synthesis in RF communications, radar-related RF signal generation, test and measurement equipment, and other systems requiring programmable microwave or millimeter-wave-adjacent frequencies. Its fractional-N architecture is especially relevant when a system needs fine frequency granularity, rapid tuning, or controlled modulation rather than a fixed integer-divider output. A key design consideration is that fractional operation introduces fractional spurs. Designers should select the reference, loop filter, charge-pump settings, and output frequency carefully so that modulation requirements and spur performance can be met simultaneously. The external loop-filter component values and board layout should follow the manufacturer’s guidance rather than being selected from generic PLL assumptions. This page consolidates the verified 13.5 GHz frequency capability, 25-bit fractional architecture, package information, pricing reference, and application guidance for ADF4169CCPZ. It also distinguishes search-result comparison candidates from true drop-in alternatives because the supplied cross-reference data does not verify their package dimensions, pin assignments, or electrical compatibility.
ADF4208BRU - Dual 2 GHz Integer-N PLL | Analog Devices
The Analog Devices ADF4208BRU is a dual RF phase-locked loop frequency synthesizer with a 2 GHz maximum input frequency, integer-N operation, and a 20-pin TSSOP package. Each synthesizer integrates a low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, programmable A and B counters, and a selectable dual-modulus prescaler. The verified ADF4206/ADF4208 datasheet identifies the part specifically as a dual RF PLL frequency synthesizer intended for wireless receiver and transmitter local oscillators. A frequency synthesizer is a clock-generation and timing-control semiconductor that locks an output oscillator to a stable reference frequency. The ADF4208 belongs to the PLL, frequency synthesizer, clock generator, and phase-locked loop product hierarchy. Its two independent synthesizer channels can support separate local-oscillator paths in wireless upconversion and downconversion circuits, reducing the number of discrete frequency-generation blocks required on a radio board. The verified feature summary lists operation from 5 MHz to 2 GHz, a 5.5 V power supply, selectable charge-pump supply for extended tuning-voltage operation, selectable charge-pump currents for 3 V systems, and an on-chip oscillator circuit. The selectable dual-modulus prescaler and programmable A, B, and reference counters provide the integer-N frequency-planning controls needed to derive stable local-oscillator outputs from a common reference. Each PLL channel combines digital phase-frequency detection with a precision charge pump and programmable dividers. The charge pump controls the tuning interface to an external voltage-controlled oscillator, while the prescaler and integer counters define the multiplication ratio. The on-chip oscillator offers an additional reference-source option where the board architecture cannot provide a suitable external reference. The integrated architecture is intended to simplify RF local-oscillator design while retaining programmable division and charge-pump settings. Typical uses include wireless receiver and transmitter local oscillators, upconverter and downconverter synthesis, RF transceiver frequency generation, and other communications equipment requiring deterministic phase locking. The dual-channel arrangement is particularly useful where a radio requires two related or independent synthesized frequencies. Because the exact tuning range, phase-noise values, lock-time limits, and operating-temperature limits are not included in the supplied verified excerpts, engineers should consult the complete manufacturer datasheet before finalizing bandwidth, spur, and temperature-margin calculations. When laying out the ADF4208BRU, place the reference and RF input paths away from charge-pump and digital-control return currents. Use a clean, low-impedance ground reference and follow the manufacturer's recommended decoupling arrangement. The external VCO loop filter remains a critical RF design element because it determines phase noise, reference spurs, lock behavior, and tuning-range stability. Validate the complete loop rather than treating the PLL IC as an isolated clock block. This page consolidates the verified manufacturer and distributor information, separates known parameters from missing engineering data, and adds practical guidance for RF layout, PLL loop design, and device selection. It also documents the absence of verified drop-in replacements instead of presenting unverified or packaging-only MPN variants as drop-in alternatives.
ADF4210BCP - 1.2 GHz Dual RF/IF PLL | Analog Devices
Analog Devices ADF4210BCP is a dual RF/IF phase-locked-loop frequency synthesizer supporting input frequencies from 0 MHz to 1.2 GHz in a 20-lead LFCSP surface-mount package. It operates from a 2.7 V to 5.5 V power supply, includes a separate charge-pump supply that permits an extended tuning voltage in 3 V systems, and uses a three-wire serial interface for programming and control. A PLL, or phase-locked loop, is a frequency-control circuit that locks an output oscillator to a stable reference frequency. A frequency synthesizer expands that reference into programmable RF or IF frequencies for communication, instrumentation, broadcast, and test systems. Within the broader semiconductor hierarchy, the ADF4210BCP is a clock-and-timing IC, a frequency synthesizer, and ultimately a phase-locked-loop integrated circuit. Key features include a programmable dual-modulus prescaler with selectable RF and IF prescaler values of 8/9, 16/17, 32/33, or 64/65. Programmable RF and IF charge-pump currents support tuning-range adjustment. The device also provides analog and digital lock detection, a Fastlock mode for faster acquisition, and a power-down mode. These functions allow the synthesizer to be adapted to different reference frequencies, loop filters, and lock requirements. The ADF4210BCP combines an integer-N PLL architecture with programmable dual-modulus prescaling. Separate programming for the RF and IF paths allows one PLL to generate a range of output frequencies while supporting different prescaler ratios. The separate charge-pump supply, identified as VP, can extend the available tuning voltage beyond the principal supply level, which is useful when designing a low-voltage system around the device's 2.7 V minimum operating supply. Typical uses include RF and IF signal-chain synthesis in wireless receivers, transmitters, test equipment, and communications infrastructure. The 1.2 GHz maximum input frequency makes the device suitable for intermediate-frequency and radio-frequency synthesis stages where a programmable local oscillator or clock is required. Its three-wire serial interface simplifies connection to a host microcontroller, while digital lock detect provides a status signal for system sequencing. When designing a new board around the ADF4210BCP, verify the reference-divider ratio, prescaler selection, charge-pump current, loop-filter components, and required VCO tuning range before finalizing the schematic. The PLL reference and feedback paths are sensitive to noise, so use short, controlled-routing traces, adequate ground-plane connectivity, and appropriately placed loop-filter components according to the manufacturer datasheet. This product page consolidates the verified ADF4210 family information, distributor availability references, package details, and engineering design guidance into one searchable source. It also distinguishes confirmed device parameters from unavailable pricing and replacement data, helping engineers evaluate the ADF4210BCP without treating unverified values as manufacturer specifications.
ADF4210BRU - 1.2 GHz Dual RF/IF PLL | Analog Devices
Analog Devices ADF4210BRU is a dual RF/IF integer-N PLL frequency synthesizer with RF operation up to 550 MHz and IF operation up to 1.2 GHz, housed in a 20-lead TSSOP package. It operates from a 2.7 V to 5.5 V power supply and uses a separate charge-pump supply to support extended tuning-voltage operation in 3 V systems. The device provides programmable dual-modulus RF and IF prescalers, programmable charge-pump current, a 3-wire serial interface, analog and digital lock detection, Fastlock operation, and power-down capability. A phase-locked loop, or PLL, is a feedback-controlled frequency-generation circuit whose phase-locked output is referenced to an input oscillator. The ADF4210BRU belongs to the broader frequency synthesizer hierarchy, where a phase detector compares a divided feedback signal with a reference signal and the charge pump converts phase error into a tuning voltage for a voltage-controlled oscillator. This architecture allows a single synthesizer to support programmable frequency generation in RF and intermediate-frequency signal chains. The principal features are tightly aligned with demanding communications and frequency-generation designs. The 8/9, 16/17, 32/33, and 64/65 dual-modulus prescaler choices provide tradeoffs between division ratio and prescaler operating range. Programmable charge-pump current supports tuning-loop optimization, while the separate VP supply gives designers additional control over the tuning-voltage range. Analog and digital lock indicators provide both analog status information and a digital signal suitable for supervisory control. Fastlock operation allows the frequency synthesizer to change between programmed settings with reduced acquisition time compared with the normal lock sequence. The 3-wire serial interface supports programming through DATA, CLOCK, and LE functions, while power-down mode can reduce consumption when the synthesizer is not required. The industrial temperature grade and surface-mount TSSOP-20 package target compact, automated electronic assemblies, although the exact operating-temperature limits and package dimensions require confirmation in the manufacturer datasheet. Typical uses include local-oscillator generation for receivers, IF and RF frequency synthesis in communications equipment, frequency conversion in instrumentation, phase-related signal generation in industrial systems, and programmable local-oscillator architectures in test equipment. In each case, the combination of dual RF/IF synthesis, selectable prescalers, programmable charge-pump current, and lock-status reporting supports compact frequency-plan implementation. The main design consideration is the interaction among reference frequency, prescaler, charge-pump settings, loop filter components, and required lock time. Designers should use the manufacturer’s frequency-planning guidance and verify settling behavior in the final loop-filter implementation rather than assuming lock performance from the input frequency alone. The separate VP connection and external loop filter also require careful PCB layout to minimize noise and unwanted coupling. This product page combines the verified ADF4210 product-page capabilities with explicit data-availability limits, avoiding invented pricing, pin assignments, or lifecycle claims. It also distinguishes verified device functions from engineering assumptions that still require validation against the complete ADF4210 datasheet and the target reference oscillator, VCO, and loop-filter implementation.
ADF4211BCP - Dual RF/IF Integer-N PLL | Analog Devices
The Analog Devices ADF4211BCP is a dual RF/IF integer-N PLL frequency synthesizer supporting inputs up to 2 GHz and operating from a 5.5 V supply in a 20-pin LFCSP package. The device provides separate RF and IF synthesis paths, programmable dual-modulus prescalers, programmable charge-pump currents, and a separate charge-pump supply for extended tuning-voltage operation. These features make it suitable for local oscillators, clock generation, modulation and demodulation systems, and dual-band RF signal chains. A PLL frequency synthesizer is a timing and frequency-control IC that locks a voltage-controlled oscillator to a stable reference frequency. Within the broader hierarchy, a PLL belongs to the clock and timing IC family, which supports frequency generation, phase management, distribution, and modulation. The ADF4211BCP combines a programmable integer-N divider, frequency comparison, charge-pump output, reference-frequency division, and RF/IF prescaling in one integrated circuit. Verified device features include RF and IF prescaler paths, programmable dual-modulus operation, programmable charge-pump currents, a 5.5 V power supply, and a separate VP charge-pump supply. The separate VP rail allows the tuning voltage to extend beyond the nominal operating range when higher-range VCO tuning is required. Programmable prescaler and charge-pump settings give the system designer control over divider ratios, phase-detector behavior, and loop-current selection. The ADF4211BCP belongs to the ADF4211 dual PLL family and is identified in available listings as a clock generator, PLL, or frequency synthesizer. The provided manufacturer-related search data confirms an input range from 0 MHz to 2 GHz and describes the device as a dual RF/IF PLL. Family documentation also identifies 0.5 GHz, 1.2 GHz, 2.0 GHz, 2.7 GHz, and 3.0 GHz operating-band combinations associated with the product family, although the exact enabled path and divider configuration must be confirmed in the manufacturer datasheet. Typical uses include RF transceiver local oscillators, IF signal generation, communication receivers and transmitters, test equipment, and dual-channel clock synthesis. The dual architecture allows two related synthesis paths to share a reference while supporting different output frequencies. Designers should select the appropriate prescaler, divider, charge-pump current, loop filter, reference divider, and VCO tuning range for the target output plan. The principal design consideration is loop stability. Component values must be derived from the selected prescaler, PFD frequency, charge-pump current, VCO gain, and required phase-noise performance. PCB return paths, ground-plane continuity, supply bypassing, and isolation between noisy digital control lines and sensitive RF outputs are also critical in high-frequency implementations. This product record combines the verified ADF4211BCP specifications, package information, sourcing links, candidate family comparisons, and practical PLL design guidance. It is intended to help engineers evaluate clock-generation and RF/IF synthesis requirements before completing reference-design and loop-filter validation.
ADF4212BRU - Dual Integer-N 0.5/1.2GHz PLL | Analog Devices
The Analog Devices ADF4212BRU is a dual integer-N RF/IF phase-locked-loop frequency synthesizer with channel rates of 0.5 GHz/1.2 GHz, operating from a 2.7 V to 5.5 V supply and housed in a 20-pin TSSOP package. The device supports 3 V systems, provides programmable dual-modulus prescalers for RF and IF inputs, and offers programmable charge-pump currents for loop filtering and phase-noise optimization. A frequency synthesizer is a timing and control component that locks an output frequency to a stable reference by comparing a divided feedback signal with a reference oscillator. The phase-locked-loop, or PLL, hierarchy includes frequency synthesizer -> clock generator -> clock and timing IC -> integrated circuit. The ADF4212BRU occupies the RF/IF end of that hierarchy, where integer-N feedback division and phase comparison generate a controllable tuning voltage for an external voltage-controlled oscillator or frequency synthesizer core. The dual-channel architecture allows two independent RF or IF synthesis paths within one device. Separate charge-pump supply support permits extended tuning voltage where the system requires greater tuning range. According to the manufacturer product page and indexed datasheet material, the ADF4212 family supports programmable charge-pump currents and dual-modulus prescaling. These controls work with external loop-filter components, reference dividers, and feedback dividers to determine lock behavior, phase noise, and channel spacing. The ADF4212BRU is intended for RF and IF signal chains that require multiple related frequencies from a common reference. Typical uses include communications equipment, frequency conversion blocks, RF test and measurement systems, and instrumentation requiring precise phase alignment. The integer-N architecture favors channels that can be represented by integer division ratios relative to the reference frequency. Designers should account for the 2.7 V to 5.5 V supply range, preserve adequate headroom for the core, charge-pump, and external oscillator interfaces, and design the loop filter around the selected prescaler, charge-pump current, reference frequency, and required phase-noise performance. Printed-board layout must minimize reference and feedback-node noise coupling because both directly influence synthesized signal purity. This page consolidates verified manufacturer and distributor information, practical implementation guidance, procurement details, and a transparent assessment of replacement options. It also distinguishes confirmed product attributes from parameters that require checking in the current manufacturer datasheet before a board-level design is released.
ADF4213BCP - 3 GHz Dual RF/IF PLL Synthesizer | Analog Devices
The Analog Devices ADF4213BCP is a dual RF/IF PLL frequency synthesizer with a 0 MHz to 3 GHz input range, programmable RF and IF outputs, and a 20-pin LFCSP package with an exposed pad. It operates from a 5.5 V power supply and includes a separate charge-pump supply to support extended tuning-voltage ranges. A PLL frequency synthesizer belongs to the clock and timing IC category. It generates a stable output frequency by phase-locking an output to a reference clock through a programmable frequency divider, a phase-frequency detector, a charge pump, a loop filter, and a voltage-controlled oscillator. Dual RF/IF architectures let one device support two related synthesis paths while providing programmable charge-pump currents and a programmable dual-modulus prescaler for RF and IF signal chains. The documented feature set includes 550 MHz/1.2 GHz, 550 MHz/2.0 GHz, 1.0 GHz/2.7 GHz, and 1.0 GHz/3 GHz frequency options. The separate VP charge-pump supply allows the tuning voltage to extend beyond the limits imposed by a single-supply implementation, which is useful when the VCO requires a wide tuning range. The device also supports 3 V systems and provides programmable RF and IF charge-pump currents. The ADF4213BCP is intended for RF and IF frequency generation in receivers, transmitters, upconverters, downconverters, and test equipment. Its dual-channel architecture is useful when a system must synthesize coherent RF and IF frequencies from a common reference, while the programmable prescaler supports different input-frequency divisions. The exposed pad permits thermal conduction through the PCB, although copper area, via placement, and thermal performance still require board-level validation. Designers should preserve loop-filter stability, reference-line cleanliness, and controlled impedance on RF and IF paths. Because the exact phase-noise figures, lock range, temperature limits, and pin-level register map were not supplied in the retrieved records, they should be confirmed against the current Analog Devices ADF4213 data sheet, Rev. A, before release. The separate charge-pump supply also requires careful sequencing and rail planning. This page consolidates the verified manufacturer, distributor, and cross-reference records into a structured product view. It adds application guidance, engineering considerations, comparison parameters, and sourcing context that are not presented together in a distributor catalog, while clearly identifying specifications that still require confirmation from the manufacturer documentation.
ADF4216BRU - Dual Integer-N PLL Synthesizer 1.2 GHz | Analog Devices
The Analog Devices ADF4216BRU is a dual RF PLL frequency synthesizer delivering a 550 MHz to 1.2 GHz RF output with an integer-N phase-locked loop architecture, packaged in a 20-lead TSSOP. It combines a low-noise digital phase frequency detector (PFD), a precision charge pump, programmable reference and RF/IF dividers, and a 3-wire serial interface in a single RF/IF local oscillator (LO) solution. A PLL frequency synthesizer is a closed-loop timing device in which a voltage-controlled oscillator (VCO) output is phase- and frequency-locked to a stable reference source through a phase frequency detector and charge pump. It sits in the RF and IF signal chain of wireless transmitters and receivers, converting a single low-frequency reference into the high, spectrally pure local oscillator tones required for up-conversion and down-conversion. The hierarchy runs from phase-locked loop to frequency synthesizer to clock and timing IC to integrated circuit. The ADF4216 supports programmable reference, RF, and IF N-divider ratios, selectable charge pump currents, and selectable dual-modulus prescalers of 16/17 for the IF chain and 64/65 for the RF chain. Because the loop is integer-N, the synthesizer frequency is the reference frequency multiplied by an integer ratio, giving excellent phase noise and very low reference feedthrough at the cost of fractional-N flexibility. A dedicated power-down mode shuts the part down for leakage control between burst transmissions. Operated from a 3 V to 5.5 V supply, the device integrates everything a designer needs for a dual-LO transceiver front end: two independent synthesizer channels that can drive both the RF and IF sections of a wireless receiver or transmitter. The 3-wire serial interface allows the divider ratios, prescaler, charge pump, and counter settings to be loaded from a host microcontroller or baseband processor. Typical applications include GSM and CDMA wireless handsets, wireless local loop and base-station equipment, WCDMA and TD-SCDMA transceiver front ends, RFID readers, microwave and satellite up/down converters, and instrumentation. In each case the device replaces separate oscillators and dividers while tightening phase noise and reducing board area. When designing around the ADF4216, pay close attention to loop filter component selection, reference phase noise, and the charge pump setting. A mismatched charge pump current and bandwidth combination produces high reference spurs, while an aggressive loop bandwidth trades phase noise for lock time. Keep the reference and RF traces short and well decoupled, and follow the grounding and decoupling layout recommended in the manufacturer datasheet. This page combines verified distributor and manufacturer information with drop-in alternatives, a parameter-by-parameter comparison table, and practical design notes that go beyond the raw datasheet tables, helping engineers shortlist, source, and lay out the part with confidence.
ADF4218BRU - 2.5GHz Dual RF PLL Synthesizer | Analog Devices
The Analog Devices ADF4218BRU is a dual, integer-N RF PLL frequency synthesizer covering 550 MHz to 2.5 GHz, with a 2.7 V to 5.5 V supply and a 20-pin TSSOP package. It provides independent synthesizers for RF and IF local oscillators in wireless receiver and transmitter circuits, using a low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, programmable integer divider, and selectable dual-modulus prescaler. A phase-locked loop, or PLL, is a feedback-controlled timing circuit that locks an output oscillator to a stable reference frequency. The oscillator and voltage-controlled oscillator form the complete frequency synthesizer, while the ADF4218BRU handles reference division, phase detection, charge-pump current generation, programmable integer-N division, and prescaling. In the wider semiconductor hierarchy, it is a clock-and-timing IC and frequency synthesizer used for RF signal generation and frequency conversion. The device supports RF prescaler choices of 16/17 or 64/65 and selectable charge-pump currents. Its three-wire serial interface allows reference frequency, prescaler, integer-N counter, charge-pump, and band-select programming. Available dual-synthesizer configurations include 550 MHz/1.2 GHz, 550 MHz/2.0 GHz, and 550 MHz/2.5 GHz, depending on the selected variant and operating setup. Each synthesizer path uses a digital phase-frequency detector to compare a divided feedback signal with the divided reference. The resulting phase error drives the charge pump and external loop filter, which in turn control a VCO. Designers select loop bandwidth, reference division, charge-pump current, and filter components to balance phase noise, lock time, spur performance, and reference-multiplier requirements. Typical uses include wireless handset RF and IF local oscillators, GSM receivers and transmitters, wireless infrastructure, instrumentation, and other RF up-conversion or down-conversion systems. The 20-pin TSSOP package is also suitable for compact, surface-mounted frequency-generation boards where the external VCO and loop filter can be placed close to the RF signal path. When designing around the ADF4218BRU, preserve the datasheet-specified decoupling and keep the reference, loop-filter, and VCO connections compact. The integrated divider and detector simplify frequency planning, but phase noise, lock range, and spur performance still depend heavily on the external VCO, loop filter, reference quality, and board layout. This page combines verified manufacturer and distributor information with practical PLL design considerations, source-backed alternatives, and a parameter comparison. It highlights where the ADF4218BRU fits and where ADF4216BRU, ADF4217BRU, or the web-referenced ADF4212LBRUZ-RL may require further qualification before substitution.
ADF4251BCP - 3.0 GHz Fractional-N Synthesizer | Analog Devices
Analog Devices ADF4251BCP is a dual fractional-N/integer-N frequency synthesizer with 3.0 GHz fractional-N operation, 1.2 GHz integer-N operation, and a 3.3 V power supply in a 24-terminal surface-mount chip carrier package. It combines fractional-N or integer-N synthesis with programmable dual-modulus prescalers, a 3-wire serial interface, programmable charge-pump currents, digital lock detect, and power-down control. A frequency synthesizer is a timing IC that generates a controlled output frequency from a stable reference. A fractional-N synthesizer can achieve fractional division ratios while retaining the coarse tuning range associated with integer-N architecture. Within the broader hierarchy, the ADF4251BCP is a PLL frequency synthesizer, a clock-and-timing IC, and a semiconductor intended for RF local-oscillator generation and signal conversion. Key features include RF prescaler options of 4/5 and 8/9, a programmable IF prescaler, and a separate charge-pump supply that permits an extended tuning voltage. The 3-wire serial interface enables digital programming, while digital lock detect provides a hardware indication of synthesizer lock status. These controls are useful when the oscillator must be adjusted in real time or monitored by a host controller. The synthesizer is intended to operate with an external voltage-controlled oscillator and loop filter, completing a phase-locked-loop implementation. Its fractional-N maximum operating frequency is 3.0 GHz, whereas its integer-N maximum is 1.2 GHz. The supplied source information does not provide the complete prescaler selection matrix, reference-frequency limits, minimum channel spacing, phase-noise values, tuning-voltage limits, or register map, so those values remain unverified in this record. Typical uses include RF local oscillators, upconversion and downconversion paths, wireless communication infrastructure, test-and-measurement equipment, and frequency-generation systems. The separate VP connection can be valuable when the external VCO and loop-filter design requires a tuning voltage beyond the range supported by the synthesizer supply itself. Designers should treat the ADF4251BCP as the synthesizer element rather than a complete standalone oscillator. The external VCO, loop filter, reference source, decoupling network, and controlled impedance layout directly determine lock range, phase noise, spur performance, and tuning accuracy. Verify all register settings and interface timing against the manufacturer datasheet before firmware and PCB release. This product record combines verified manufacturer capabilities, distributor availability references, package information, application guidance, and a strict comparison of the ADF4251 family. It also separates documented facts from unavailable electrical details, helping engineers evaluate the ADF4251BCP without introducing unverified substitute or pricing claims.
ADF4252BCP - 3 GHz Dual Fractional-N PLL | Analog Devices
The Analog Devices ADF4252BCP is a dual fractional-N/integer-N frequency synthesizer with RF operation up to 3 GHz, integer-N operation up to 1 GHz, and a 24-lead LFCSP package with exposed pad. It operates from a 3.3 V power supply, provides a separate VP connection for extended tuning voltage up to 5 V, and provides programmable RF prescalers of 4/5 and 8/9. Its three-wire serial interface supports digital programming of the dual synthesizer architecture. A frequency synthesizer is a clock-and-timing integrated circuit that generates a programmable output frequency from a stable reference. The ADF4252 belongs to the phase-locked-loop hierarchy: fractional-N or integer-N frequency synthesizer → phase-locked loop → clock generator and timing IC. This type of device is used when an RF system requires a locally controlled oscillator with fine frequency resolution and direct digital programming. The dual architecture permits independent RF and IF synthesis paths, which is valuable in wireless receivers and transmitters requiring both an RF local oscillator and an intermediate-frequency local oscillator. The RF section reaches 3 GHz, while the integer-N range reaches 1 GHz. The programmable dual-modulus prescaler supports integer-N and fractional-N operation, and programmable charge-pump currents allow loop behavior to be adapted for different reference and phase-noise requirements. A reported phase-noise figure of 103 dBc/Hz at a 5 kHz offset is identified for GSM-related operation. The manufacturer data sheet also describes a narrow-loop filter configuration intended to meet steady-state spurious specifications, using the lowest charge-pump current for normal operation and the maximum setting during a fast-lock frequency jump. This technique separates acquisition performance from final steady-state performance. Typical applications include RF upconversion and downconversion in wireless receivers, RF transmitters, GSM-compatible communication equipment, instrumentation, and other systems requiring independently programmed RF and IF local oscillators. The 3.3 V core supply and programmable serial interface simplify integration with embedded control hardware. A key design consideration is reference and loop planning. The reference frequency, prescaler, feedback divider, charge-pump current, and loop-filter values must be selected together to meet both phase-noise and lock-time targets. The separate VP supply should also be evaluated against the required tuning-voltage range rather than assumed to follow the digital supply automatically. This page consolidates the verified manufacturer specifications, distributor information, package details, replacement findings, and practical design considerations into one engineering-oriented reference for evaluating the ADF4252BCP in RF and IF frequency-generation systems.
ADF4350BCPZ - Wideband Synthesizer w/ Integrated VCO | ADI
The Analog Devices ADF4350BCPZ is a wideband frequency synthesizer with an integrated voltage controlled oscillator (VCO) that operates on a fundamental output frequency range of 2200 MHz to 4400 MHz. Housed in a 32-lead LFCSP (5 mm x 5 mm) exposed-pad package, the part enables fractional-N or integer-N phase-locked loop (PLL) implementations when paired with an external loop filter and an external reference frequency. Divide-by-1/2/4/8/16 output dividers extend usable RF outputs as low as 137.5 MHz. A PLL frequency synthesizer is a closed-loop feedback system that compares a divided VCO output to a reference oscillator and adjusts the VCO tuning voltage until the divided frequency phase-locks to the reference. Fractional-N division enables finer frequency resolution than integer-N at the cost of additional noise-shaping circuitry, while integer-N mode delivers the lowest in-band phase noise. ADF4350 supports both modes, letting engineers trade off resolution against phase-noise performance for applications ranging from cellular base stations to test instrumentation. Key features include an output frequency span of 137.5 MHz to 4400 MHz, a 3-wire SPI-compatible serial interface for register programming, an auxiliary RF output that can be muted independently, and a phase-frequency detector (PFD) that supports reference frequencies up to 200 MHz. The integrated VCO eliminates the need for a discrete resonator, simplifying BOM and reducing board area in radio designs. According to the Analog Devices datasheet, the part supports channel spacing down to a sub-1 Hz resolution when used in fractional-N mode with proper modulator settings. The architecture combines a high-resolution sigma-delta modulator, a low-noise charge-pump, and a wideband VCO that is prescaled for stable locking across process and temperature variations. The mute function is both pin- and software-controllable, allowing the part to be shut down during idle periods in time-division duplex systems to save power. Typical applications include cellular base-station transceivers (GSM, UMTS, LTE, 5G FR1), microwave point-to-point and point-to-multipoint links, satellite communications up-converters, wireless backhaul infrastructure, and bench-top RF signal generators. The 32-lead LFCSP package provides a compact thermal envelope suitable for dense multi-radio boards. When designing with the ADF4350BCPZ, route the charge-pump supply through a ferrite bead and bypass it with a 10 nF cap to minimize reference spurs, and place the loop-filter components as close to the CP and VT pins as practical. Avoid routing digital SPI lines adjacent to the RF outputs to prevent crosstalk into the synthesized spectrum. This page synthesizes distributor pricing, drop-in alternatives drawn from the Analog Devices family, and practical layout notes that complement - but do not replace - the manufacturer datasheet.
ADF4351BCPZ - 4.4 GHz Fractional-N PLL Synthesizer | Analog Devices
The Analog Devices ADF4351BCPZ is a fractional-N or integer-N phase-locked-loop frequency synthesizer with an integrated voltage-controlled oscillator, a 2.2 GHz to 4.4 GHz fundamental VCO range, and operation up to 4.4 GHz. The device accepts a 10 MHz to 250 MHz reference input and is supplied in a 32-lead VFQFN exposed-pad package. It supports programmable integer and fractional frequency synthesis through an external reference and loop filter. An RF frequency synthesizer generates a stable, programmable output by locking a voltage-controlled oscillator to a reference through a phase-locked loop. The ADF4351 belongs to the PLL synthesizer and clock-generator hierarchy, integrating the synthesizer, VCO, programmable dividers, reference and feedback paths, and RF output circuitry. This integration reduces board-level design effort while retaining the flexibility required for external loop-filter optimization. According to the Analog Devices product page and datasheet, the ADF4351 supports fractional-N and integer-N synthesis, includes an integrated VCO, and is intended for wideband RF applications. The 10 MHz to 250 MHz input range and 2.2 GHz to 4.4 GHz fundamental VCO range make it suitable for microwave communication, wireless infrastructure, test equipment, radar-related RF signal chains, and frequency-agile RF systems. Its fractional-N operation permits fine frequency resolution when the reference and N-divider settings are selected appropriately. The device requires an external loop filter and external reference frequency. Filter component selection affects loop bandwidth, phase noise, reference-spur behavior, lock time, and the amount of ripple presented to the VCO control node. Designers should evaluate loop dynamics for each output frequency rather than assuming one filter network is optimal across the full 2.2 GHz to 4.4 GHz range. The exposed pad provides the required thermal and electrical connection to the PCB. Typical implementation places the ADF4351 between a stable reference source and an RF load or receiver/transmitter signal chain. The output can be filtered, buffered, or mixed according to the system requirement. Keep the reference and loop-filter connections short, provide clean supply decoupling, and use a controlled-impedance RF layout for the output path. Verify phase noise, spur levels, lock behavior, output power, and temperature performance with the final reference and filter implementation. For direct replacement, verify package dimensions, exposed-pad construction, pin assignments, register compatibility, reference range, VCO range, and supply limits. A similar frequency range alone is insufficient for drop-in use. This page combines verified manufacturer and distributor information with practical PLL design considerations, comparison fields, and sourcing-oriented FAQ answers. Pricing and availability should be confirmed with authorized distributors as of 2026-10-21.
ADF4355BCPZ - 6.8GHz Fractional-N PLL | Analog Devices
Analog Devices ADF4355BCPZ is a fractional-N or integer-N phase-locked-loop frequency synthesizer with an integrated voltage-controlled oscillator, an RF output range of 54 MHz to 6800 MHz, and a 32-WFQFN exposed-pad package. The device supports 1.8 V logic compatibility, 3.3 V analog and digital supplies, and typically 5.0 V charge-pump and VCO supplies. Its programmable output division ratios are 1, 2, 4, 8, 16, 32, or 64, while the dual-modulus prescaler and 38-bit modulus support fine frequency resolution. A fractional-N frequency synthesizer generates a stable, programmable output frequency by combining a phase-locked loop, a frequency divider, and a high-resolution modulus. The ADF4355 belongs to the broader hierarchy of clock-generation ICs, frequency synthesizers, phase-locked loops, and RF timing components. Integrating the VCO reduces the number of external microwave components needed to implement a tunable local oscillator, although an external reference, loop filter, and passive matching network are still required. Key features include operation to 6.8 GHz, low phase noise from the integrated VCO, programmable charge-pump current, programmable reference dividers, digital and analog lock detection, and hardware or software power-down. The 38-bit modulus permits fractional-N synthesis with high nominal frequency resolution. Programmable output division extends the usable RF range and allows integer-N or fractional-N configurations to be selected according to phase-noise, spur, and tuning requirements. Technically, the ADF4355 uses an integrated wideband VCO with programmable output division and a dual-modulus prescaler for fractional-N operation. The reference path divides an external source before phase comparison with the divided VCO output. An external passive loop filter converts the phase-detector charge-pump current into the control voltage applied to the VCO. The exact loop bandwidth, reference ratio, and filter values therefore determine lock range, settling time, phase noise, and fractional-N spur performance. Typical applications include microwave and millimeter-wave test equipment, frequency conversion in communications receivers, local-oscillator generation for RF front ends, radar or satellite signal-chain prototypes, and instrumentation requiring programmable RF outputs. The integrated VCO is particularly useful where a fixed local-oscillator module would be too restrictive or where several frequencies must be generated from one reference source. The exposed thermal pad must be connected to a low-impedance ground plane, and the RF output requires careful impedance-controlled routing. Component placement should minimize loop-filter area and keep sensitive control and supply paths away from the RF output. Designers must also verify regulator tolerances, charge-pump settings, reference phase noise, and loop-filter calculations before operation across the full frequency range.