ADF4252BCP - 3 GHz Dual Fractional-N PLL | Analog Devices
N.º de pieza: ADF4252BCP ✓ ActivoADF4252BCP Descripción general
A frequency synthesizer is a clock-and-timing integrated circuit that generates a programmable output frequency from a stable reference. The ADF4252 belongs to the phase-locked-loop hierarchy: fractional-N or integer-N frequency synthesizer → phase-locked loop → clock generator and timing IC. This type of device is used when an RF system requires a locally controlled oscillator with fine frequency resolution and direct digital programming.
The dual architecture permits independent RF and IF synthesis paths, which is valuable in wireless receivers and transmitters requiring both an RF local oscillator and an intermediate-frequency local oscillator. The RF section reaches 3 GHz, while the integer-N range reaches 1 GHz. The programmable dual-modulus prescaler supports integer-N and fractional-N operation, and programmable charge-pump currents allow loop behavior to be adapted for different reference and phase-noise requirements.
A reported phase-noise figure of 103 dBc/Hz at a 5 kHz offset is identified for GSM-related operation. The manufacturer data sheet also describes a narrow-loop filter configuration intended to meet steady-state spurious specifications, using the lowest charge-pump current for normal operation and the maximum setting during a fast-lock frequency jump. This technique separates acquisition performance from final steady-state performance.
Typical applications include RF upconversion and downconversion in wireless receivers, RF transmitters, GSM-compatible communication equipment, instrumentation, and other systems requiring independently programmed RF and IF local oscillators. The 3.3 V core supply and programmable serial interface simplify integration with embedded control hardware.
A key design consideration is reference and loop planning. The reference frequency, prescaler, feedback divider, charge-pump current, and loop-filter values must be selected together to meet both phase-noise and lock-time targets. The separate VP supply should also be evaluated against the required tuning-voltage range rather than assumed to follow the digital supply automatically.
This page consolidates the verified manufacturer specifications, distributor information, package details, replacement findings, and practical design considerations into one engineering-oriented reference for evaluating the ADF4252BCP in RF and IF frequency-generation systems.
Alternativas directas para ADF4252BCP — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
ADF4252BCPZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADF4252BCP Especificaciones
| Device Type | Dual fractional-N/integer-N frequency synthesizer |
| Maximum RF Frequency | 3 GHz |
| Maximum Integer-N Frequency | 1 GHz |
| Minimum Operating Frequency | 50 MHz |
| Power Supply Voltage | 3.3 V |
| VP Tuning Supply Range | Up to 5 V |
| RF Prescaler Ratios | 4/5 and 8/9 |
| IF Prescaler | Programmable |
| Charge Pump Current | Programmable |
| Serial Interface | 3-wire |
| Phase Noise | 103 dBc/Hz at 5 kHz offset |
| Number of Synthesizers | 2 |
| Encapsulado | 24-lead LFCSP with exposed pad |
| Tipo de montaje | Surface mount |
| Production Status | Production |
Guía de configuración de pines de ADF4252BCP 24-lead lfcsp with exposed pad
Configuración de pines para ADF4252BCP (encapsulado 24-lead lfcsp with exposed pad). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para ADF4252BCP.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ADF4252BCP es adecuado para 6 aplicacións: Wireless Receiver Local Oscillator, Wireless Transmitter RF Synthesizer, Dual RF and IF Local Oscillator, GSM Communication Equipment, RF Test and Measurement Equipment, Industrial RF Signal Conditioning.
Wireless Receiver Local Oscillator
The ADF4252BCP fits wireless receiver front ends that require a programmable RF local oscillator for direct or intermediate-frequency downconversion. Its dual fractional-N and integer-N architecture reaches 3 GHz in RF operation, while the 4/5 and 8/9 RF prescalers provide prescaler choices for different reference and feedback-divider plans. A 3.3 V core supply and three-wire serial interface simplify connection to the receiver control processor. In implementation, the reference frequency, N divider, prescaler, charge-pump current, and loop filter must be evaluated together. The verified 103 dBc/Hz phase-noise figure at a 5 kHz offset provides a useful GSM-related comparison point, but the actual receiver requirement depends on channel spacing, integration bandwidth, and synthesizer lock time.
Recomendado
Wireless Transmitter RF Synthesizer
The ADF4252BCP can generate the programmable RF local oscillator required by wireless transmitter upconversion chains. Its RF path operates up to 3 GHz and supports fractional-N synthesis for fine channel spacing as well as integer-N operation up to 1 GHz. This makes it applicable to transmitters whose signal path must be translated to a selected RF channel. The serial interface permits channel and test-mode updates from embedded firmware. Designers should use the manufacturer guidance on charge-pump current and the narrow-loop-filter configuration, particularly when rapid frequency jumps and low steady-state spurious content are both required.
Recomendado
Dual RF and IF Local Oscillator
The ADF4252BCP is well matched to systems that require independent RF and IF local oscillators because it contains dual fractional-N/integer-N synthesis paths. Separate RF and IF outputs can support receivers, transmitters, or test equipment that must generate more than one coherent frequency. The RF section reaches 3 GHz, and the documented IF prescaler is programmable. This integration reduces the number of separate synthesizer packages, although the firmware must configure both channels correctly. Loop bandwidth, reference spurs, and phase-noise contributions should be analyzed for each path because coherent use of two outputs does not guarantee identical spectral performance for both synthesizers.
Recomendado
GSM Communication Equipment
The ADF4252BCP is suitable for GSM-related RF generation because the verified technical data identifies a 103 dBc/Hz phase-noise figure at a 5 kHz offset. Its fractional-N operation permits fine frequency adjustment, while the programmable charge pump and fast-lock technique support systems that must acquire a new channel quickly and then maintain low steady-state spurious performance. The Analog Devices datasheet specifically describes using the lowest charge-pump setting for a narrow loop and temporarily increasing it during frequency jumps. A production design must verify lock time, reference-divider spur behavior, output-power requirements, and adjacent-channel performance in the complete transmitter and receiver chain.
Recomendado
RF Test and Measurement Equipment
The ADF4252BCP can serve as the programmable frequency source in RF instrumentation requiring accurate local-oscillator generation. Its three-wire serial interface permits automated frequency setup, while dual synthesis provides flexibility when a test set needs coordinated RF and IF reference signals. Fractional-N operation can offer finer frequency resolution than integer-N-only schemes, and the RF input range extends to 3 GHz. In laboratory equipment, however, reference accuracy, phase noise, spur levels, lock time, and output-drive requirements may dominate the selection. The loop filter and firmware must be designed to avoid settling artifacts during automated frequency sweeps.
Recomendado
Industrial RF Signal Conditioning
The ADF4252BCP fits industrial RF signal-conditioning modules that require a stable, digitally programmable local oscillator. RF operation up to 3 GHz supports RF conversion stages, while the separate VP connection can extend tuning voltage to 5 V when the required charge-pump and loop-filter arrangement demands additional headroom. The exposed-pad LFCSP improves heat transfer from the device, but the verified data does not state its thermal resistance, so board copper and thermal analysis must be based on the official data sheet. Firmware should include lock detection and conservative frequency-step timing to avoid commanding downstream RF stages before the loop has settled.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADF4252BCP — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADF4252BCPZ |
|---|---|---|
| Brand | Analog Devices | Analog Devices |
| Package | 24-lead LFCSP with exposed pad | 24-lead LFCSP with exposed pad |
| Device Type | Dual fractional-N/integer-N frequency synthesizer | Clock/frequency synthesizer, fractional-N and integer-N |
| Maximum RF Frequency | 3 GHz | 3 GHz |
Diferenciadores clave
- Dual RF and IF synthesis in one device (frente a ADF4252BCPZ)
- Separate high-voltage tuning path (frente a ADF4252BCPZ)
- Programmable RF prescaler choices (frente a ADF4252BCPZ)
Notas de diseño
Do not treat the ADF4252BCP and ADF4252BCPZ suffix labels as automatically interchangeable without checking the ordering information. Both are associated with the same 24-lead LFCSP exposed-pad family, but temperature grade, reel configuration, and commercial ordering details can differ by suffix. Also do not treat ADF4360-7BCP as a drop-in substitute based only on a comparison page: the verified evidence does not confirm identical pinout, register map, reference range, or phase-noise performance.
The ADF4252BCP uses a 3.3 V main supply and provides a separate VP connection for extended tuning voltage up to 5 V. Treat these rails independently: the VP requirement depends on charge-pump current, loop-filter design, and required tuning range. Decouple both supply domains close to their relevant pins according to the manufacturer layout guidance, and confirm that VP never exceeds the absolute maximum specified in the ADF4252 data sheet, Rev. E.
The 24-lead LFCSP has an exposed thermal pad, so its land pattern and solder process must follow the official package drawing rather than a generic QFN footprint. Keep the exposed-pad connection short to the ground plane and minimize loop area around the synthesizer supply pins. Use a continuous ground reference beneath the device where the package drawing permits it, and route the reference and feedback connections away from noisy switching nodes to reduce coupled spurs.
Select the reference frequency, prescaler, N divider, charge-pump current, and loop filter as one system. The Analog Devices data sheet describes a narrow-loop configuration that uses the lowest charge-pump current for steady-state spurious performance and temporarily raises charge-pump current during fast-lock frequency jumps. Reusing a loop-filter design without confirming the reference rate and feedback topology can produce longer lock time, reference-divider spurs, or excessive phase noise.
Información de cumplimiento
The verified excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. No compliance claim has been inferred.
