ADF4155BCPZ - 4 GHz Fractional-N PLL | Analog Devices
MPN： ADF4155BCPZ ✓ 啟用中ADF4155BCPZ 概覽
A phase-locked loop, or PLL, is a feedback-controlled oscillator that locks a programmable output frequency to a stable reference. Integer-N operation preserves integer division, while fractional-N operation permits finer frequency steps through a programmable modulus. Within the broader hierarchy of clock and timing ICs, a PLL frequency synthesizer belongs to the clock-generator and phase-locked-loop family used to create stable, programmable RF and microwave signals.
The ADF4155 supports fractional-N and integer-N synthesis, a programmable modulus, differential RFOUT+ and RFOUT− connections, and four programmable tail-current levels for the output differential pair. The exposed pad assists heat transfer from the device into the PCB. Its industrial temperature grade and surface-mount construction suit communication, instrumentation, and industrial control systems requiring accurate frequency generation.
Internally, the reference signal passes through divider and phase-detector functions before controlling an external VCO through the external loop filter. The RFOUT+ and RFOUT− pins connect to the collectors of an NPN differential pair driven by the RF divider block. Programming the differential-pair tail current changes available output power, giving the system designer four current settings rather than one fixed output condition.
Typical applications include cellular and wireless infrastructure, microwave radio equipment, instrumentation and test systems, radar-related signal sources, industrial RF control, and frequency conversion modules. The component is particularly appropriate when the designer wants a flexible integer-N or fractional-N architecture with an external VCO instead of an integrated fixed-frequency oscillator.
Design the loop filter for the required phase margin and loop bandwidth rather than treating it as a generic RC network. Keep the reference, feedback, VCO, and RF traces short and controlled, and provide a low-impedance ground path around the exposed pad. Confirm the programmed divider, modulus, charge-pump current, reference frequency, and output power settings together because each affects lock behavior and phase noise.
This product page combines the ADF4155BCPZ device specifications, package information, application guidance, and the electrically identical but differently packaged ADF4155BCPZ-RL7 option. It also identifies the engineering limits of substitution, helping designers distinguish a true same-footprint replacement from a merely similar PLL.
直接替換替代品，適用於 ADF4155BCPZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADF4155BCPZ （相同外形與佔位） — 差異在於 Package.
ADF4155BCPZ-RL7
✅ 直接替換📋 參考替代品（不在目錄中）
ADF4155BCPZ 規格
| Product Type | Integer-N / Fractional-N PLL frequency synthesizer |
| Maximum Output Frequency | 4 GHz |
| Reference Input Frequency Range | 500 MHz to 8 GHz |
| Maximum External VCO Operating Frequency | 8 GHz |
| Maximum Input Frequency | 8 GHz |
| Synthesizer Architecture | Integer-N / Fractional-N |
| Programmable Modulus | Programmable |
| RF Output Configuration | Differential RFOUT+ and RFOUT− |
| Output Differential-Pair Tail Current Levels | 4 programmable levels |
| Required External Components | External loop filter, VCO, and reference frequency source |
| 腳位數 | 24 pins |
| 封裝 | 24-WFQFN with exposed pad |
| Package Shape | Square |
| 安裝類型 | Surface mount |
| Temperature Grade | Industrial |
| Shipping Package | Tray |
| RoHS 狀態 | Compliant |
ADF4155BCPZ tray 腳位配置指南
ADF4155BCPZ（tray 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： ADF4155BCPZ.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADF4155BCPZ 適用於 6 應用s: Wireless Transceiver Frequency Synthesis, RF and Microwave Test Instrumentation, Industrial RF Control and Conversion, Cellular Infrastructure Signal Sources, Microwave Frequency Conversion, Programmable Radar and Microwave Signal Generation.
Wireless Transceiver Frequency Synthesis
The ADF4155BCPZ fits wireless transceiver frequency plans that require selectable integer-N or fractional-N ratios around a 4 GHz output. The synthesizer can use an external VCO operating up to 8 GHz, allowing the RF architecture to select a suitable oscillator for the required band and tuning range. Differential RFOUT+ and RFOUT− outputs feed the downstream RF signal path, while the programmable modulus supports finer channel spacing than integer division alone. The 24-WFQFN exposed-pad package supports compact RF layouts, but the loop-filter component values and VCO selection must be chosen together to meet phase-noise, spur, lock-time, and output-power targets.
推薦
RF and Microwave Test Instrumentation
The ADF4155BCPZ can form the programmable synthesis section of an RF or microwave test source because it supports a 4 GHz output and an external VCO range up to 8 GHz. Integer-N mode supports exact integer relationships, while fractional-N mode gives the instrument designer finer spacing between generated frequencies. The external loop filter and VCO allow the noise, tuning-range, and settling characteristics to be tailored for the instrument specification. Four programmable tail-current settings for the differential output pair provide additional control over output conditions. Designers should evaluate reference phase noise, loop bandwidth, and board grounding before using the 24-WFQFN part for high-accuracy measurement results.
推薦
Industrial RF Control and Conversion
The ADF4155BCPZ is appropriate for industrial RF-control systems that require an adjustable local oscillator rather than a fixed crystal frequency. Its fractional-N architecture permits programmable channel spacing, and the external VCO can be selected to suit the industrial frequency band and required tuning range. The differential RFOUT+ and RFOUT− interface provides a convenient connection into the next RF stage, while the industrial temperature grade supports non-consumer operating environments. Because the device does not integrate the VCO, engineers must account for VCO tuning sensitivity, supply pushing, loop-filter phase margin, and thermal drift. The exposed pad should be connected to ground according to the manufacturer layout guidance.
推薦
Cellular Infrastructure Signal Sources
The ADF4155BCPZ can support local frequency-generation requirements in cellular infrastructure equipment where the desired channel frequency must be derived accurately from a stable reference. Its fractional-N and integer-N modes permit architecture selection based on channel spacing and spectral requirements, while the 4 GHz output and 8 GHz external-VCO limit provide useful radio-frequency coverage. The external loop filter makes bandwidth and phase margin design tools specific to each reference and VCO combination. Differential RF outputs help connect the synthesizer to the transmitter or receiver chain. Production designs should characterize reference spurs, fractional-N noise, lock behavior under temperature changes, and the power consumed by the 24-WFQFN device.
推薦
Microwave Frequency Conversion
The ADF4155BCPZ is suitable for the synthesizer section of a microwave upconverter or downconverter when an external VCO provides the required 8 GHz-class operating range. Its programmable fractional-N modulus permits selectable conversion ratios, and the differential RF output can feed a mixer or other conversion stage. The external loop filter provides control over how aggressively the loop corrects phase and frequency errors, making it important to match loop bandwidth to the conversion channel width. Engineers should also preserve reference and feedback-path isolation to avoid modulating the output with digital or switching noise. A controlled ground plane and properly terminated exposed pad are essential in the compact 24-WFQFN footprint.
推薦
Programmable Radar and Microwave Signal Generation
The ADF4155BCPZ can support programmable microwave signal generation when a system requires selectable frequency settings from a stable external reference. Fractional-N operation supports fine frequency steps, and the external-VCO architecture up to 8 GHz lets the designer separate frequency-range selection from the synthesizer choice. The differential RFOUT+ and RFOUT− outputs provide a practical interface to the RF processing chain. For radar or other coherent systems, reference quality and loop dynamics influence phase noise and settling behavior, so the reference path and loop filter require careful design. Thermal management of the exposed pad and controlled RF layout are also necessary to preserve repeatability as ambient conditions and device loading change.
推薦
推薦產品摘要
工程參考資料，適用於 ADF4155BCPZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADF4155BCPZ-RL7 |
|---|---|---|
| Package | 24-WFQFN exposed pad | 24-WFQFN exposed pad - same |
| Brand | Analog Devices | Analog Devices |
| Product Type | Integer-N / Fractional-N PLL frequency synthesizer | Integer-N / Fractional-N PLL frequency synthesizer |
| Maximum Output Frequency | 4 GHz | 4 GHz |
| Maximum Input Frequency | 8 GHz | 8 GHz |
| External VCO Operating Range | Up to 8 GHz | Up to 8 GHz |
| Programmable Modulus | Programmable | Programmable |
| Number of Pins | 24 pins | 24 pins |
| Orderable Packaging | Tray | Reel |
主要差異化特點
- Identical electrical configuration in a reel-packaged ordering form (對比ADF4155BCPZ-RL7)
- Combines integer-N and fractional-N synthesis (對比ADF4155BCPZ-RL7)
- External-VCO operation extends integration flexibility (對比ADF4155BCPZ-RL7)
設計說明
Implement the RF and reference paths as short, controlled-impedance routes with no unnecessary stubs. Place the loop-filter components close to the relevant device pins and keep the RFOUT+ and RFOUT− routing symmetric. The exposed pad requires a low-impedance ground connection and adequate thermal copper according to the manufacturer package guidance.
Do not select the external VCO and loop filter independently of the intended reference ratio. Programmed dividers, fractional modulus, charge-pump settings, reference frequency, and VCO gain interact to determine lock behavior and phase margin. Evaluate the complete loop across temperature and supply variation rather than relying only on nominal lock conditions.
Use the exposed pad as both a thermal path and a grounded return. Follow the manufacturer layout and land-pattern requirements, maintain uninterrupted ground-plane area beneath the package where applicable, and avoid thermally isolated copper regions. Validate the final assembly across the expected ambient range and maximum synthesizer loading rather than estimating thermal performance from the package name alone.
Preserve reference-signal purity because reference phase noise and spurs propagate through the PLL. Keep the reference path away from switching nodes and noisy return currents, use appropriate source impedance, and confirm that the differential RF outputs are terminated according to the selected downstream circuit. Use the manufacturer register information to configure the four available differential-pair tail-current levels.
合規資訊
RoHS compliance is identified in the ADF4155BCPZ-RL7 comparison listing. No additional compliance declarations are stated for the target ordering code.
