ADF4355-2BCPZ - 4.4 GHz PLL with Integrated VCO | Analog Devices
料号： ADF4355-2BCPZ ✓ 量产中ADF4355-2BCPZ 概述
A phase-locked loop is a feedback-controlled timing system that locks an internal voltage-controlled oscillator to a stable reference frequency. In the ADF4355-2, the reference signal, frequency divider, phase detector, charge pump, external loop filter, VCO, and output stages form a programmable RF synthesis system. This architecture allows an external reference and loop filter to establish channel spacing, tuning resolution, phase noise, and lock behavior.
The ADF4355-2 supports fractional-N operation with a 38-bit modulus and integer-N operation for applications requiring different tuning schemes. Its RF output frequency range extends from 54 MHz to 4400 MHz, making the device suitable for communication transmitters, test equipment, instrumentation, radar-related signal sources, and frequency conversion stages. Programmable output power and programmable integer and fractional divider values provide flexibility across a wide range of RF designs.
The device accepts a reference frequency range of 10 MHz to 500 MHz according to the manufacturer product information. The external loop filter is a key circuit element: its components determine loop bandwidth, reference spur suppression, phase noise, and lock time. The ADF4355-2 therefore supports both simple integer-N channel plans and higher-resolution fractional-N frequency plans without requiring a separate VCO.
Typical implementation places the ADF4355-2 in an RF signal chain between a stable reference source and the powered RF section. The synthesizer generates a programmable carrier, while the external loop filter shapes the closed-loop response. Keep the reference and feedback traces short, use a controlled ground return, and place bypass capacitors close to the supply pins. Power-down modes can be useful in battery-powered or intermittently operating systems because they reduce activity when the RF output is not required.
The main design trade-off is loop-filter complexity. Fractional-N operation improves frequency resolution, but it also requires careful spur planning and often more demanding layout practice. Integer-N mode can simplify spur behavior for applications that do not need fine channel spacing. The manufacturer datasheet should guide the register sequence, reference setup, loop-filter calculation, and final performance validation.
This product page combines the ADF4355-2BCPZ electrical identity, pin and package information, drop-in alternatives, comparison points, and practical RF design guidance. It is intended to help engineers select the correct synthesizer variant, plan the loop filter, and integrate a low-noise programmable RF source without overlooking supply, reference, layout, or power-management constraints.
直接替换替代料： ADF4355-2BCPZ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADF4355-2BCPZ （相同外形与封装尺寸） ——差异在于 Package, Device Type, Maximum RF Output Frequency, RF Output Frequency Range, Reference Input Frequency Range.
ADF4355-3BCPZ
✅ 直接替换联系询价
查看数据手册 →ADF4355BCPZ
✅ 直接替换联系询价
查看数据手册 →ADF4351BCPZ
✅ 直接替换联系询价
查看数据手册 →ADF4356BCPZ
✅ 直接替换联系询价
查看数据手册 →ADF4355-2BCPZ-RL7
✅ 直接替换📋 参考替代料（不在目录中）
ADF4355-2BCPZ 规格参数
| Device Type | Fractional-N and integer-N RF frequency synthesizer |
| Integrated VCO | Yes |
| RF Output Frequency Range | 54 MHz to 4400 MHz |
| Maximum RF Output Frequency | 4400 MHz |
| Reference Input Frequency Range | 10 MHz to 500 MHz |
| Synthesizer Modulus | 38-bit |
| Analog and Digital Supply Voltage | 3.15 V to 3.45 V |
| Charge Pump and VCO Supply Voltage | 4.75 V to 5.25 V |
| Power-Down Modes | Hardware and software power-down |
| Output Power | Programmable |
| Frequency Divider | Programmable divide or 64 |
| Loop Filter | External |
| Reference Input | External reference frequency |
| 封装 | 32-pin WFQFN with exposed pad |
| 安装类型 | Surface mount |
| Output Frequency | 4400 MHz maximum |
ADF4355-2BCPZ 32-pin wfqfn with exposed pad 引脚配置指南
ADF4355-2BCPZ（32-pin wfqfn with exposed pad 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： ADF4355-2BCPZ.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ADF4355-2BCPZ 适用于 6 应用s: RF Communication Transmitter, Test and Measurement Signal Source, RF Frequency Conversion, Instrumentation and Calibration, Portable RF Measurement Device, Communications Module.
RF Communication Transmitter
The ADF4355-2BCPZ fits a programmable RF transmitter or local-oscillator stage because it combines an integrated VCO with fractional-N and integer-N synthesis from 54 MHz to 4400 MHz. It is placed between a stable reference source and the transmitter signal chain, with an external loop filter controlling lock bandwidth and reference spur behavior. The 38-bit modulus supports fine channel spacing, while programmable output power allows the RF gain stage to be adjusted for the required drive level. Confirm the channel plan, reference frequency, loop-filter values, and output-frequency limits in the manufacturer documentation before layout release.
推荐
Test and Measurement Signal Source
The ADF4355-2BCPZ is useful in test and measurement equipment that requires a programmable RF source over 54 MHz to 4400 MHz. Its integrated VCO reduces the number of external frequency-generation blocks, and programmable output power helps match different receiver or DUT input ranges. The external loop filter remains the central design element because it influences phase noise, reference spur suppression, and settling time. During evaluation, measure tuning accuracy, lock behavior, output power, and phase noise across the required test frequencies and operating conditions.
推荐
RF Frequency Conversion
In a receiver or transceiver frequency-conversion path, the ADF4355-2BCPZ can generate a programmable local oscillator for mixing a high-frequency channel down to a lower intermediate frequency. Its broad RF output range supports multiple test bands or receiver plans, while fractional-N operation enables precise channel placement. The reference path and loop filter should be designed together so that phase noise and spurs meet the receiver sensitivity requirement. Preserve short RF traces, provide a controlled ground return, and validate lock time during frequency changes before fixing the loop bandwidth.
推荐
Instrumentation and Calibration
The ADF4355-2BCPZ can serve as a programmable RF calibration source in laboratory and production instrumentation because it provides a wide tuning span, programmable output power, and fractional-N frequency resolution. The external reference establishes frequency accuracy, while the loop filter determines how quickly the synthesizer settles and how much reference energy appears at the output. For calibration equipment, characterize frequency accuracy and output-level repeatability over temperature. Use the hardware and software power-down functions when the instrument is idle, then confirm wake-up and reacquisition timing in the complete system.
推荐
Portable RF Measurement Device
A portable spectrum analyzer, detector, or compact RF test device can use the ADF4355-2BCPZ to synthesize a stimulus over 54 MHz to 4400 MHz without a separate VCO. The broad tuning range covers many application bands, and the integrated VCO simplifies the RF signal chain. Because portable equipment is often battery operated, the hardware and software power-down modes help control energy use when a measurement is not in progress. The power budget should account for the 3.15 V to 3.45 V and 4.75 V to 5.25 V supply domains, while the reference and loop-filter layout should prioritize phase noise and frequency stability.
推荐
Communications Module
The ADF4355-2BCPZ is appropriate for a compact communications module requiring an integrated, programmable RF source with fractional-N resolution. It can support channelized test loops, local-oscillator generation, or configurable RF stimulus generation within the 54 MHz to 4400 MHz range. The separate charge-pump and VCO supply rail helps organize the power architecture, while the analog and digital rail supports the control and digital functions. Design the PCB with short reference and feedback paths, local bypass capacitors, and an exposed-pad thermal plan. Validate lock time and spur performance across every switching frequency used by the module.
推荐
推荐产品汇总
工程参考数据： ADF4355-2BCPZ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ADF4355-3BCPZ | ADF4355BCPZ | ADF4351BCPZ | ADF4356BCPZ |
|---|---|---|---|---|---|
| Package | 32-pin WFQFN with exposed pad | 32-pin WFQFN with exposed pad | 32-pin WFQFN with exposed pad | 32-pin WFQFN with exposed pad | 32-pin WFQFN with exposed pad |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
关键差异点
- Integrated-VCO PLL coverage （对比 ADF4351BCPZ)
- Broad RF tuning range with fractional-N operation （对比 ADF4355-3BCPZ)
- Separate low- and high-voltage supply domains （对比 ADF4355BCPZ)
- Programmable output power and hardware/software shutdown （对比 ADF4356BCPZ)
设计说明
Separate the 3.15 V to 3.45 V analog/digital rail from the 4.75 V to 5.25 V charge-pump and VCO rail according to the manufacturer application guidance. Place local high-frequency bypass capacitors at the supply pins and keep power-return paths continuous. Estimated supply current and total dissipation require calculation from the actual output-power setting, load, and supply voltage; no fixed current value is stated in the product information.
Route the reference input and feedback paths as short and isolated as practical, with a controlled ground reference and no digital switching traces running directly beneath them. Keep the external loop-filter components close to their associated pins where practical and provide a solid ground reference beneath the sensitive RF section. The 32-pin exposed-pad package requires attention to copper area, thermal vias, and the manufacturer package-land pattern.
Do not select the external loop filter from output frequency alone. The reference frequency, PFD rate, channel spacing, desired lock time, phase-noise target, reference-spur requirement, and output-power setting all influence the component values. After assembly, verify lock time, phase noise, reference spurs, tuning accuracy, and output level at the highest and lowest required frequencies.
High reference or VCO operating frequencies can couple into nearby analog or digital circuitry even when the final output frequency is much lower. Use short supply connections, solid return paths, controlled ground partitioning, and shielding or filtering where radiated emissions become significant. Evaluate conducted and radiated emissions with the final enclosure, cable arrangement, reference source, and loop filter because an isolated IC-level assessment may not predict system behavior.
合规信息
The component is an RF clock and timing IC rather than an automotive-qualified AEC-Q100 device. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status were not stated in the referenced product information.
