ADF4355BCPZ - 6.8GHz Fractional-N PLL | Analog Devices
料号： ADF4355BCPZ ✓ 量产中ADF4355BCPZ 概述
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.
直接替换替代料： ADF4355BCPZ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
ADF4355-3BCPZ
✅ 直接替换📋 参考替代料（不在目录中）
ADF4355-1BCPZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADF4355-4BCPZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADF4356-2BCPZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADF4360-0BCPZ
✅ 直接替换📋 参考替代料（不在目录中）
ADF4355BCPZ 规格参数
| Device Type | Fractional-N or integer-N RF clock/frequency synthesizer with integrated VCO |
| RF Output Frequency Range | 54 MHz to 6800 MHz |
| Maximum RF Output Frequency | 6800 MHz |
| Minimum RF Output Frequency | 54 MHz |
| PLL Modulus Resolution | 38 bit |
| Programmable Output Divide Ratios | 1, 2, 4, 8, 16, 32, or 64 |
| Logic Compatibility | 1.8 V |
| Analog and Digital Supply | 3.3 V |
| Charge Pump and VCO Supply | 5.0 V typical |
| Prescaler Configuration | Programmable dual-modulus prescaler |
| Lock Detection | Analog and digital |
| Power-Down Control | Hardware and software |
| 封装 | 32-WFQFN exposed-pad CSP |
| 安装类型 | Surface mount |
| Manufacturer Recommended Status | Recommended for new designs |
ADF4355BCPZ 32-wfqfn exposed-pad csp 引脚配置指南
ADF4355BCPZ（32-wfqfn exposed-pad csp 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： ADF4355BCPZ.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ADF4355BCPZ 适用于 6 应用s: Microwave Test and Measurement, Communications RF Local Oscillator, Radar Signal-Chain Prototyping, RF Front-End Frequency Conversion, Satellite and Microwave Signal Sources, Frequency-Sweep Instrumentation.
Microwave Test and Measurement
The ADF4355BCPZ fits programmable microwave test equipment because its integrated VCO covers 54 MHz to 6800 MHz without a separate oscillator module. A single external reference can establish multiple coherent output frequencies through the fractional-N or integer-N synthesizer, while the 38-bit modulus supports fine nominal frequency resolution. The 1.8 V-compatible interface also simplifies connection to modern test-instrument control logic. Design qualification should measure phase noise, spurious signals, lock time, and output power across the intended band because final loop performance depends on the external reference and passive loop filter.
推荐
Communications RF Local Oscillator
The ADF4355BCPZ is suitable for generating a tunable local oscillator in microwave communication receivers and transmitters because its 54 MHz to 6800 MHz range covers wideband RF conversion requirements. The programmable divide ratios of 1, 2, 4, 8, 16, 32, and 64 support multiple output configurations, while the integrated VCO simplifies the RF oscillator topology. The primary engineering trade-off is that fractional-N operation can introduce deterministic spurs; designers should select integer-N or fractional-N settings according to the required phase-noise and spur performance and validate the design using the completed board layout.
推荐
Radar Signal-Chain Prototyping
The ADF4355BCPZ supports rapidly reconfigurable radar and microwave signal-chain prototypes by combining an integrated VCO with programmable fractional-N and integer-N synthesis. Its output can be tuned from 54 MHz through 6800 MHz, allowing one board design to address multiple RF test points. The 38-bit modulus offers high nominal resolution, but practical tuning granularity also depends on the reference frequency and integer divider settings. During implementation, keep the RF output path impedance controlled, isolate the loop filter from high-energy RF routing, and verify settling behavior after each frequency change.
推荐
RF Front-End Frequency Conversion
The ADF4355BCPZ can provide the tunable oscillator required by an RF front-end that converts microwave signals to or from a lower-frequency processing chain. Its integrated VCO reduces assembly complexity, and programmable output division allows the synthesizer to serve more than one RF output range. The external reference and loop filter remain critical because they establish phase noise, lock range, and tuning speed. Use short 50-ohm-controlled RF connections, maintain suitable supply decoupling at the device, and account for the temperature-dependent behavior of the wideband VCO during production calibration.
推荐
Satellite and Microwave Signal Sources
The ADF4355BCPZ is applicable to programmable microwave signal sources used in satellite communication and microwave test benches because it combines a 6800 MHz maximum output frequency with digital frequency control. A common reference can support repeatable measurements, and the 1.8 V logic compatibility helps connect the synthesizer to embedded controllers. The device is not a complete laboratory signal source by itself: engineers still need a stable reference, suitable loop filtering, output-level conditioning, and calibration. Validate phase noise, reference spurs, and lock behavior over the required environmental conditions before using the output for compliance measurements.
推荐
Frequency-Sweep Instrumentation
The ADF4355BCPZ supports frequency-sweep instrumentation because the internal 38-bit modulus allows fine nominal frequency settings and the integrated VCO provides a compact RF output stage. Its programmable divider and fractional-N architecture can generate multiple frequencies from one reference, reducing the number of switched RF sources required in a test system. Settling time will depend on the reference ratio, loop bandwidth, filter network, and frequency distance, so a sweep system should characterize settling dynamically rather than rely on a fixed delay. The exposed-pad ground connection and compact loop-filter layout are particularly important for repeatable measurement results.
推荐
推荐产品汇总
工程参考数据： ADF4355BCPZ ——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 | ADF4355-1BCPZ | ADF4355-4BCPZ | ADF4356-2BCPZ | ADF4360-0BCPZ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 32-WFQFN Exposed Pad | 32-WFQFN Exposed Pad - same | 32-WFQFN Exposed Pad - same | 32-WFQFN Exposed Pad - same | 32-WFQFN Exposed Pad - same | 32-WFQFN Exposed Pad - same |
关键差异点
- Full 6.8 GHz maximum RF output （对比 ADF4355-2BCPZ)
- Broader standard supply architecture （对比 ADF4355-3BCPZ)
- High-resolution fractional-N architecture （对比 ADF4360-0BCPZ)
- Broad programmable output division （对比 ADF4355-1BCPZ)
设计说明
Place the external loop-filter components close to the charge-pump and VCO-control pins, and use the shortest practical return path to the ground reference. Keep the 32-WFQFN exposed pad connected to a continuous low-impedance ground plane with multiple vias. Avoid routing the sensitive control node beneath or parallel to the RF output because parasitic coupling can increase modulation products and make loop behavior sensitive to PCB fabrication.
Treat the RF output as a controlled-impedance path and validate the matching network with the final PCB stack-up and component parasitics. Reference phase noise and reference spurs directly influence the synthesizer output, so a numerically small nominal tuning step does not guarantee good fractional-N spur performance. Measure phase noise and deterministic spurs across the operating band after integrating the loop filter, reference source, supply regulators, and enclosure used in the final system.
Follow the manufacturer's separate 3.3 V analog/digital and typically 5.0 V charge-pump/VCO supply requirements exactly. Decouple each supply domain at the package pins and verify regulator output accuracy under worst-case load and temperature. The supplied results do not provide the complete recommended capacitor values or regulator-noise characteristics, so those details must be obtained from the manufacturer datasheet rather than assumed.
Do not treat an identical package as proof that any ADF4355-family part is automatically interchangeable. Confirm frequency band, register behavior, reference-divider range, lock-detect polarity, power-down behavior, supply levels, and any mute function against the original schematic. For a PCB already populated, also check exposed-pad soldering, component orientation, and whether the candidate's RF output characteristics meet the system requirement.
合规信息
The verified search results include a comparison page discussing RoHS and REACH status, but the provided snippets do not contain the underlying status values. Compliance fields are therefore recorded as unknown rather than inferred.
