ADF4252BCP

Overview

The ADF4252BCP is a dual fractional-N/integer-N frequency synthesizer manufactured by Analog Devices Inc. It integrates two independent synthesizers for local oscillator generation in wireless transceivers. The RF synthesizer supports frequencies up to 3.0 GHz with a Σ-Δ-based fractional interpolator, while the IF synthesizer operates up to 1.2 GHz using integer-N counters. Both sections feature low-noise digital phase-frequency detectors and precision charge pumps. The device operates on a 2.7 V to 3.3 V supply and includes a separate tuning voltage input allowing up to 5 V. Control is managed via a 3-wire serial interface.

Feature Summary

• Dual synthesizer architecture: RF section (up to 3.0 GHz) and IF section (up to 1.2 GHz)
• Fractional-N capability on RF side with programmable modulus and noise/spur optimization modes
• Programmable dual modulus prescalers for RF (4/5, 8/9) and IF (8/9, 16/17, 32/33, 64/65)
• Separate VP pins supporting extended tuning voltages up to 5.5 V

Applications

• Base stations for mobile radio (GSM, PCS, DCS, CDMA, WCDMA)
• Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA)
• Wireless LANs
• Communications test equipment
• CATV equipment

Procurement Notes

Verify the specific suffix against the manufacturer's ordering guide to confirm package type and temperature range. Ensure the component matches the required RoHS compliance status for the target assembly process. Confirm availability through authorized distributors as stock levels fluctuate.

Selection Notes

Select this component when a single chip solution is needed for both upconversion and downconversion local oscillators. Verify that the external VCO tuning voltage requirements do not exceed the 5.5 V limit on the VP pins. Ensure the reference input frequency and divider settings align with the desired channel spacing and loop bandwidth specifications.

Part Context

This part belongs to the ADF4252 family of dual frequency synthesizers. It is designed to replace discrete PLL solutions in compact wireless designs. The BCP variant typically denotes a specific package configuration within the product line, intended for surface-mount assembly.

Replacement Considerations

Check for updated revisions in the ADF4252 series. Verify pin compatibility if substituting with other dual-PLL devices from Analog Devices or competitors. Ensure electrical parameters such as charge pump current and phase detector frequency are compatible with existing loop filter designs.