ADF4157BCPZ - 6 GHz Fractional-N PLL | Analog Devices
部品番号: ADF4157BCPZ ✓ 生産中ADF4157BCPZ 概要
A fractional-N frequency synthesizer is a phase-locked-loop-based clock and frequency generator that synthesizes an output frequency from a stable reference. In the signal-chain hierarchy, the ADF4157 belongs to clock generation, PLL synthesis, and broader frequency-generation IC families. It is particularly useful when a system requires fine frequency resolution, programmable feedback ratios, and digital control over an RF output without replacing the synthesizer during configuration changes.
Key characteristics include a 6 GHz maximum synthesis frequency, 25-bit fractional-N modulus, programmable reference division, and Sigma-Delta fractional interpolation. The low-noise PFD and precision charge pump support the synthesizer’s frequency-generation role, while the fractional interpolator permits programming values between integer feedback ratios. These functions make the device applicable to communication equipment, test instruments, RF signal chains, and frequency-generation subsystems.
Technically, the ADF4157 uses a fractional-N architecture to achieve fine frequency resolution while allowing a relatively high prescaler value. The INT and FRAC registers define the integer and fractional feedback ratios, and the reference divider can be programmed to accommodate multiple reference frequencies. Its low-noise architecture also makes input signal quality, reference stability, loop-filter design, and power-supply implementation important parts of achieving predictable phase noise and spur performance.
Typical uses include local-oscillator generation for RF communications, tunable clock generation for test and measurement equipment, microwave down-conversion systems, frequency-agile signal sources, and instrumentation requiring fine tuning resolution. The 500 MHz to 6 GHz RF range supports microwave systems while the fractional-N capability allows the output to be positioned at closely spaced frequencies around a chosen reference-derived channel.
Designers should place the reference and RF input connections for controlled impedance and isolate sensitive routing from noisy digital and charge-pump paths. The loop filter, reference decoupling, supply bypassing, and exposed-pad thermal design require careful implementation. Verify lock behavior across temperature, supply tolerance, reference accuracy, and the complete intended tuning range before releasing a production board.
This product page combines the manufacturer specifications, verified distributor listings, application-oriented design guidance, and a package-focused engineering comparison. It also distinguishes the exact ADF4157BCPZ orderable variant from packaging, package-format, and functionally different parts that are not true pin-to-pin drop-in replacements.
ドロップイン代替品: ADF4157BCPZ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ADF4157BCPZ （同一形状・フットプリント） — 相違点: Package, Charge Pump.
この製品に利用可能なドロップイン代替品はありません。
代替品をリクエストADF4157BCPZ 仕様
| Product Type | Fractional-N frequency synthesizer |
| Maximum Synthesis Frequency | 6 GHz |
| Minimum RF Input Frequency | 500 MHz |
| Fractional-N Fixed Modulus | 25 bit |
| Frequency Resolution at 6 GHz | Subhertz |
| Reference Divider | Programmable |
| Fractional Interpolation | Sigma-Delta based |
| Phase-Frequency Detector | Low-noise digital PFD |
| Charge Pump | Precision charge pump |
| Analog Supply Voltage Range | 2.7 V to 3.3 V |
| Digital Supply Voltage Range | 2.7 V to 3.3 V |
| Charge Pump Supply Voltage | 2.7 V to 5.5 V |
| パッケージ | 20-lead WFQFN with exposed pad |
| 実装タイプ | Surface mount |
ADF4157BCPZ 20-lead wfqfn with exposed pad ピン配置ガイド
ADF4157BCPZ (20-lead wfqfn with exposed pad パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: ADF4157BCPZ.
詳細は データシート をご参照ください。
主な用途
ADF4157BCPZ の用途: 6 件s: 6 GHz RF Local Oscillator, Microwave Down-Conversion, Precision Test and Measurement, Frequency-Agile Signal Source, Clock Generation for RF Instrumentation, Communications Channel Tuning.
6 GHz RF Local Oscillator
The ADF4157BCPZ fits a 6 GHz local-oscillator position because its RF input range extends to 6 GHz and its 25-bit fixed modulus permits subhertz frequency resolution. The synthesizer can derive an output from a stable reference while the INT and FRAC values define the required division ratio. Use it when a communications receiver or transmitter needs fine channel placement. The practical benefit is programmable frequency selection without changing the reference oscillator, although final phase noise and spurs depend on the reference, loop filter, isolation, and PCB layout.
おすすめ
Microwave Down-Conversion
In a microwave receiver or transmitter, the ADF4157BCPZ can generate a programmable local oscillator for mixing a high-frequency channel down to a lower intermediate frequency. Its 500 MHz to 6 GHz RF range and programmable reference divider support integration with stable laboratory or communications references. Subhertz resolution at 6 GHz supports precise channel placement. Designers should preserve controlled impedance, isolate the oscillator from high-power RF paths, and verify lock range and unwanted-signal behavior across temperature and supply tolerance.
おすすめ
Precision Test and Measurement
The ADF4157BCPZ is suitable for precision test equipment that requires a programmable, finely resolved RF source. Its 25-bit fractional-N modulus provides subhertz resolution at 6 GHz, while the programmable reference divider accommodates multiple reference arrangements. This capability supports swept-test generators, bench instruments, and calibration systems. For laboratory-grade performance, evaluate reference phase noise, loop bandwidth, isolation, and calibration drift together because the synthesizer IC alone does not determine the final source accuracy.
おすすめ
Frequency-Agile Signal Source
A frequency-agile source benefits from the ADF4157BCPZ because programmable integer and fractional feedback values let firmware select closely spaced output frequencies from one stable reference. The synthesizer supports RF operation from 500 MHz to 6 GHz, making it useful for compact RF test heads and communication test fixtures. A practical implementation should include firmware limits for valid INT and FRAC combinations, reference-loss handling, lock monitoring, and calibration of the output frequency against the system reference.
おすすめ
Clock Generation for RF Instrumentation
The ADF4157BCPZ can serve as the programmable clock source in an RF instrumentation platform requiring deterministic frequency settings over a broad range. Its 6 GHz ceiling and fractional-N resolution permit channels to be positioned precisely around reference-derived frequencies. Integrating the device requires careful allocation of analog, digital, and charge-pump supplies, plus a robust reference and loop filter. Validate phase noise and spurious content at every intended output frequency rather than relying on the nominal 6 GHz headline specification.
おすすめ
Communications Channel Tuning
The ADF4157BCPZ supports communications channel tuning where a stable reference and programmable fractional division can produce closely spaced RF frequencies. Its 25-bit fixed modulus and subhertz resolution at 6 GHz are valuable when narrow channel spacing or precise offset placement matters. The device is not a complete RF transmitter; it supplies the synthesized frequency used by downstream conversion or modulation stages. System-level spur and phase-noise testing must include the reference, power supplies, filtering, isolation, and printed-circuit-board environment.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ADF4157BCPZ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 |
|---|---|
| Product Type | Fractional-N frequency synthesizer |
| Brand | Analog Devices |
| Package | 20-lead WFQFN with exposed pad |
| Maximum Synthesis Frequency | 6 GHz |
| Minimum RF Input Frequency | 500 MHz |
| Fractional-N Fixed Modulus | 25 bit |
| Frequency Resolution at 6 GHz | Subhertz |
| Analog and Digital Supply | 2.7 V to 3.3 V |
| Charge-Pump Supply | 2.7 V to 5.5 V |
| Reference Divider | Programmable |
| Fractional Interpolation | Sigma-Delta based |
| Lifecycle Status | Production |
主な差別化要因
- Fine fractional frequency resolution at the upper operating frequency （vs ADF4113BCP)
- Dedicated fractional interpolation for programmable INT and FRAC operation （vs ADF4157BRUZ-RL7)
- Broad RF synthesis range for compact RF and instrumentation systems （vs ADF4108BCPZ-RL7)
設計ノート
Route the reference and RF inputs as controlled-impedance traces with short connections to the device. Keep sensitive analog, reference, and charge-pump regions away from digital return paths and switching-node copper. The manufacturer recommends suitable input slew rate; if a lower-frequency source does not meet the 400 V/µs condition, condition it with an appropriate LVDS driver before entering the RF input. Validate ground-plane continuity and return paths so charge-pump currents do not share noisy return paths with the reference.
Decouple the 2.7 V to 3.3 V analog and digital supplies locally and use the charge-pump supply within its 2.7 V to 5.5 V range. Place the closest bypass capacitor directly between each applicable supply pin and its ground connection, with a shorter route to the exposed pad than to any external return path. Keep supply-loop area small and prevent reference and charge-pump currents from flowing through shared narrow copper sections, since supply coupling can degrade lock behavior and spectral performance.
The WFQFN exposed pad is part of the device’s thermal path and must be connected to a solid ground plane with multiple thermal vias and a controlled solder-fillet profile. Confirm the maximum local power dissipation under the worst-case reference-divider, charge-pump-supply, and output conditions, then evaluate junction temperature across ambient temperature and airflow. Use the manufacturer’s package and thermal information to select via count and copper area; avoid relying on the small exposed pad alone for heat removal.
Do not assume that every part in the ADF4157 family is a drop-in alternative. ADF4157BRUZ-RL7 uses a 16-pin TSSOP rather than the 20-lead WFQFN package of ADF4157BCPZ, so it requires a different footprint. Also validate the register map, reference-divider range, output configuration, and loop-filter design for the exact orderable variant. Reel or tape-and-reel order codes may change only the shipping format and should not be represented as distinct engineering alternatives.
コンプライアンス情報
The manufacturer documentation confirms the ADF4157 family is in production, but no explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was present in the cited records. These fields remain unknown rather than inferred.
