ADF4155BCPZ - 4 GHz Fractional-N PLL | Analog Devices
MPN: ADF4155BCPZ ✓ AktifADF4155BCPZ Ringkasan
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.
Pilihan pengganti yang segera untuk ADF4155BCPZ — sama paket, pin-pin kompatibel. Bahagian paket yang berbeza memerlukan kerja ulang PCB diasingkan.
Varietas dalam siri ini
Model serupa yang kompatibel dengan pengganti yang segera ADF4155BCPZ (sama faktor bentuk dan kaki) — berbeza dalam Package.
ADF4155BCPZ-RL7
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ADF4155BCPZ Spesifikasi
| 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 |
| Bilangan Pin | 24 pins |
| Kemasan | 24-WFQFN with exposed pad |
| Package Shape | Square |
| Jenis Pemasangan | Surface mount |
| Temperature Grade | Industrial |
| Shipping Package | Tray |
| Status RoHS | Compliant |
Panduan Konfigurasi Pin ADF4155BCPZ tray
Konfigurasi pin untuk ADF4155BCPZ (tray pakai). Penomeran pin, fungsi, dan garis bentuk koneksi ditakrifkan dalam dokumen pengeluar. Rujuk dokumen untuk kebentuk dan pedoman pengasman.
Tiada data garisan pin yang diperoleh untuk ADF4155BCPZ.
Rujuk kepada lembaran data untuk konfigurasi pin penuh.
Aplikasi Biasa
ADF4155BCPZ patut untuk 6 aplikasis: 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.
Disebarkan
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.
Disebarkan
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.
Disebarkan
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.
Disebarkan
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.
Disebarkan
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.
Disebarkan
Ringkasan Produk Disebarkan
Data referensi kejuruteraan untuk ADF4155BCPZ — perbandingan, panduan rancangan, dan maklumat kesediaan
Panduan Pilihan
Perbandingan dengan Gantian
| Parametr | Produk Ini | 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 |
Penyeberangsung Jelas
- Identical electrical configuration in a reel-packaged ordering form (vsADF4155BCPZ-RL7)
- Combines integer-N and fractional-N synthesis (vsADF4155BCPZ-RL7)
- External-VCO operation extends integration flexibility (vsADF4155BCPZ-RL7)
Catatan Desain
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.
Maklumat Kesediaan
RoHS compliance is identified in the ADF4155BCPZ-RL7 comparison listing. No additional compliance declarations are stated for the target ordering code.
