ADF4252BCPZ

Overview

The ADF4252BCPZ is a dual fractional-N/integer-N frequency synthesizer manufactured by Analog Devices Inc. It integrates two independent synthesizers: an RF section supporting frequencies up to 3.0 GHz and an IF section operating up to 1.2 GHz. The device utilizes a Sigma-Delta-based fractional interpolator for the RF path and programmable integer counters for the IF path. Operating on a 2.7 V to 3.3 V supply, it features separate power pins (VP1, VP2) allowing extended tuning voltages up to 5.5 V. The component is housed in a 24-lead LFCSP package and includes a 3-wire serial interface for register control.

Feature Summary

• Dual synthesizer architecture with RF input range of 0.25 GHz to 3.0 GHz and IF input range of 50 MHz to 1.2 GHz
• Sigma-Delta fractional-N interpolation for RF path; Integer-N counters for IF path
• Programmable charge pump currents ranging from 625 μA to 5 mA with low three-state leakage
• Digital lock detect and power-down mode reducing current consumption to 1 μA

Applications

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

Procurement Notes

Verify the specific suffix 'BCPZ' against the manufacturer's ordering guide to confirm package type and temperature grade. Ensure that the external loop filter and voltage-controlled oscillator (VCO) components are selected to match the specified charge pump currents and phase detector frequencies. Confirm that the application environment remains within the -40°C to +85°C operating range.

Selection Notes

Select this component when a single chip solution is required for both upconversion and downconversion local oscillators. The RF section supports high-frequency applications up to 3 GHz, while the IF section provides flexibility for lower intermediate frequencies. Consider the separate VP1 and VP2 pins if the external VCO requires a tuning voltage higher than the digital logic supply.

Part Context

This part belongs to the ADF4252 series of dual frequency synthesizers. It is designed to replace discrete PLL solutions in wireless infrastructure. The device simplifies design by integrating the phase frequency detectors, charge pumps, and dividers for both RF and IF loops into a single silicon die.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.