ADF4111BRU - 1.2 GHz Integer-N PLL | Analog Devices
MPN: ADF4111BRU ✓ فعالADF4111BRU نمای کلی
An integer-N PLL is a frequency-generation IC that locks an output oscillator to a stable reference by comparing the divided output phase with the reference phase. A phase-frequency detector measures the phase error, and a charge pump converts that error into a control current for an external voltage-controlled oscillator (VCO). In the broader hierarchy, the ADF4111BRU is a PLL-based frequency synthesizer, a clock-and-timing IC, and ultimately a semiconductor used to produce stable local-oscillator signals.
Key features include a 1.2 GHz nominal maximum PLL frequency for the ADF4111 device, a programmable dual-modulus P/P+1 prescaler, programmable charge-pump currents, and programmable reference and counter functions. A separate charge-pump supply permits an extended tuning-voltage range, while the 5.5 V power supply supports integration into RF receiver and transmitter systems operating from 3 V-class logic environments.
Technically, the ADF4111 belongs to the ADF4110 family of frequency synthesizers. Its low-noise digital phase-frequency detector, precision charge pump, programmable reference divider, programmable A and B counters, and dual-modulus prescaler form the core signal path. These functions allow an external reference and VCO to be combined into a closed-loop PLL capable of supporting wireless upconversion and downconversion architectures.
Typical applications include GSM and other wireless receiver local oscillators, wireless transmitter upconversion sections, RF downconversion chains, frequency-locked test equipment, and communication systems requiring a programmable RF frequency. The main design consideration is loop stability: the prescaler, charge-pump setting, reference-divider ratio, loop filter, and VCO must be evaluated together rather than selected independently.
Use the manufacturer datasheet and reference circuitry to select loop-filter values, verify lock range, route the sensitive reference and feedback paths cleanly, and confirm that the external VCO tuning range covers the required output band. This page combines verified manufacturer and distributor information, drop-in replacement analysis, and practical PLL design guidance.
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درخواست جایگزینADF4111BRU مشخصات
| Product Type | Single integer-N frequency synthesizer and phase-locked loop |
| Maximum PLL Frequency | 1.2 GHz |
| Reference Input Frequency Range | 5 MHz to 1.4 GHz |
| Maximum Output Frequency | 165 MHz |
| Power Supply Voltage | 5.5 V |
| Separate Charge Pump Supply | Supported |
| Extended Tuning Voltage | Supported through separate charge-pump supply |
| Prescaler | Programmable dual-modulus P/P+1 prescaler |
| Charge Pump Current | Programmable |
| Reference Divider | Programmable |
| Frequency Divider | Programmable A and B counters |
| Phase Frequency Detector | Low-noise digital phase-frequency detector |
| تعداد پین‌ها | 16 pins |
| بسته‌بندی | 16-pin TSSOP, 0.173 inch (4.40 mm) width |
| نوع نصب | Surface mount |
| Packaging | Tube |
| Manufacturer Production Status | Production |
راهنمای پیکربندی پین ADF4111BRU 16-pin tssop, 0.173 inch (4.40 mm) width
پیکربندی پین برای ADF4111BRU (پکیج 16-pin tssop, 0.173 inch (4.40 mm) width). شماره‌گذاری پایه‌ها، عملکردها و نمودارهای اتصال در دیتاشیت سازنده تعریف شده است. برای footprint دقیق و دستورالعمل‌های لحیم‌کاری به آن مراجعه کنید.
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کاربردهای معمول
ADF4111BRU مناسب است برای 6 کاربردs: Wireless Receiver Local Oscillator, Wireless Transmitter Upconversion, RF Downconversion Mixer, GSM Frequency-Synthesizer Design, Programmable RF Test Source, Frequency-Locked Communication Equipment.
Wireless Receiver Local Oscillator
The ADF4111BRU fits a wireless receiver local-oscillator block because it combines a 1.2 GHz integer-N PLL architecture with programmable dual-modulus prescaling, A and B counters, and charge-pump current. It is used with an external VCO to derive a stable local oscillator for a receiver downconversion stage, where the reference frequency controls channel placement. The reference input spans 5 MHz to 1.4 GHz, while the programmable feedback path adapts to the prescaler and VCO tuning range. Designers should use the manufacturer’s divider and lock-range guidance, and validate phase margin using the final VCO and loop filter rather than assuming lock from counter settings alone.
پیشنهادی
Wireless Transmitter Upconversion
In a wireless transmitter, the ADF4111BRU can generate the programmable local-oscillator signal required by an upconversion mixer. Its low-noise digital phase-frequency detector and precision charge pump work with an external VCO to produce a stable RF reference, while programmable reference, A-counter, B-counter, and prescaler values support flexible frequency planning. The separate charge-pump supply permits a higher VCO tuning range than a shared supply would allow. Actual output capability remains dependent on the external VCO and loop bandwidth, so RF output filtering, spur analysis, and adjacent-channel requirements must be checked during system integration.
پیشنهادی
RF Downconversion Mixer
The ADF4111BRU is suitable for producing the local-oscillator signal used by an RF downconversion mixer because it supports an integer-N frequency plan and reference inputs from 5 MHz to 1.4 GHz. A stable reference phase-locked to an external VCO allows the receiver’s mixer to translate an RF channel to a lower intermediate frequency. Programmable charge-pump current and counter settings help the designer establish the required division ratio, but loop dynamics remain dependent on VCO gain and the passive loop-filter network. Printed-circuit layout should preserve a short, clean reference path and isolate sensitive RF nodes from charge-pump and digital-control signals.
پیشنهادی
GSM Frequency-Synthesizer Design
The manufacturer family documentation specifically discusses using the ADF4111 family with a 13 MHz TCXO and an on-chip reference divider to obtain 200 kHz channel spacing for GSM applications. The ADF4111BRU therefore fits legacy GSM synthesizer blocks that require programmable integer-N frequency generation. The 5.5 V supply and separate charge-pump supply support practical RF tuning architectures, while programmable prescaler and counter functions provide the required division ratios. Designers should account for reference accuracy, divider-ratio integer constraints, reference spurs, and the phase-margin limits imposed by the selected loop bandwidth.
پیشنهادی
Programmable RF Test Source
The ADF4111BRU can serve as the synthesizer element of a programmable RF test source when the design includes an external VCO. Its programmable prescaler, A and B counters, reference divider, and charge-pump settings permit frequency selection through an external control interface, while the reference input range of 5 MHz to 1.4 GHz supports laboratory reference architectures. The component does not generate RF energy by itself, so output power, tuning range, settling time, and phase noise must be established by the surrounding VCO and loop design. For automated instrumentation, firmware must also verify lock status and handle valid lock-time behavior across each commanded frequency.
پیشنهادی
Frequency-Locked Communication Equipment
The ADF4111BRU fits communication equipment requiring a programmable, reference-locked RF source for transmit or receive conversion. Its integer-N topology and programmable P/P+1 prescaler provide a straightforward way to establish rational frequency ratios between a stable reference and a VCO output. The device operates from a 5.5 V supply architecture and supports a distinct charge-pump supply, which is useful when the VCO requires an extended tuning-voltage range. Practical implementation requires careful grounding of the charge-pump filter, short reference routing, stable VCO supply arrangement, and register-level verification of the programmed division ratios and lock behavior.
پیشنهادی
داده‌های مرجع مهندسی برای ADF4111BRU — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول |
|---|---|
| Package | 16-pin TSSOP, 0.173 inch (4.40 mm) width |
| Brand | Analog Devices |
| Product Type | Single integer-N frequency synthesizer and PLL |
| Maximum PLL Frequency | 1.2 GHz |
| Reference Input Frequency Range | 5 MHz to 1.4 GHz |
| Maximum Output Frequency | 165 MHz |
| Power Supply Voltage | 5.5 V |
| Prescaler | Programmable dual-modulus P/P+1 prescaler |
| Charge Pump Current | Programmable |
| Charge Pump Supply | Separate supply supported |
تفاوت‌های کلیدی
- Integer-N architecture aligned with the ADF4111 1.2 GHz maximum PLL frequency (در مقابلADF4153BRUZ)
- Broader verified reference-input coverage than the comparison candidates’ supplied specifications (در مقابلADF4112BRUZ)
- Programmable RF control functions in a compact surface-mount package (در مقابلADF4118BRUZ)
یادداشت‌های طراحی
Do not select the loop-filter values independently of the reference divider, prescaler, charge-pump current, VCO gain, and target phase margin. The ADF4111BRU is a controller for an external VCO, so a numerically correct divider ratio does not by itself guarantee lock or acceptable phase noise. Begin from the Analog Devices family data sheet, calculate the complete loop, and verify acquisition range, lock time, and phase margin with the actual VCO and reference source.
Keep the reference input and PLL feedback paths short, controlled-impedance where appropriate, and away from the charge-pump output and switching nodes. Place the charge-pump loop filter close to the relevant device pins, provide local supply bypassing according to the manufacturer layout guidance, and maintain a low-impedance ground return. Poor routing near the phase-frequency detector can degrade phase noise or introduce unstable behavior even when the programmed divider values are correct.
The separate charge-pump supply allows an extended VCO tuning-voltage range and must be treated as a distinct rail rather than casually tied to the main supply. Decouple the main and charge-pump supplies at the device, confirm that the charge-pump voltage remains within the external VCO and ADF4111 absolute-maximum limits, and account for the voltage difference across the charge-pump filter. Exact capacitor and voltage-limit values require the manufacturer data sheet because they were not included in the supplied source snippets.
Use a clean, stable reference with low phase noise and verify that its frequency falls within the supported 5 MHz to 1.4 GHz range. Reference phase noise, divider ratios, and VCO noise directly influence the synthesized output. When fast settling or low phase noise is required, evaluate the complete reference-to-output noise budget rather than judging the ADF4111BRU from its nominal 1.2 GHz PLL frequency alone.
اطلاعات انطباق
The supplied search results identify a comparison page mentioning RoHS and REACH for ADF4118BRUZ versus ADF4111BRU, but they do not state the resulting status for ADF4111BRU. Compliance fields therefore remain unknown.
