ADF4157BCPZ-RL7

Overview

The ADF4157BCPZ-RL7 is a high-resolution 6 GHz fractional-N frequency synthesizer manufactured by Analog Devices Inc. It features a 25-bit fixed modulus, enabling subhertz frequency resolution at maximum output frequencies. The device integrates a low-noise digital phase frequency detector (PFD), a precision charge pump with programmable currents, and a third-order Σ-Δ fractional interpolator. Operating on a single 2.7 V to 3.3 V supply, it includes cycle slip reduction circuitry for faster lock times and a 3-wire serial interface for register control. The B version supports an industrial temperature range of -40°C to +85°C.

Feature Summary

• RF bandwidth up to 6 GHz with 25-bit fixed modulus for subhertz resolution
• Integrated third-order Σ-Δ fractional interpolator and cycle slip reduction
• Programmable charge pump currents ranging from 312.5 µA to 5 mA via RSET
• Separate VP pin allows extended tuning voltage up to 5.5 V

Applications

• Satellite communications terminals
• Radar equipment
• Instrumentation equipment
• Personal mobile radio (PMR) base stations
• Wireless handsets

Procurement Notes

Verify the specific suffix RL7 corresponds to the reel packaging format required for your assembly line. Confirm that the B version grade meets the necessary industrial temperature specifications (-40°C to +85°C). Ensure the LFCSP package thermal requirements are addressed in the PCB design, specifically connecting the exposed pad to AGND for optimal heat dissipation.

Selection Notes

Select this component when subhertz frequency resolution is required at RF frequencies up to 6 GHz. The separate VP supply pin is critical if the target VCO requires a tuning voltage exceeding the standard AVDD level. Verify that the reference input frequency falls within the 10 MHz to 300 MHz range and that the loop filter design accommodates the programmable charge pump characteristics.

Part Context

The ADF4157 belongs to the ADF41xx series of integer and fractional-N synthesizers. It is pin-compatible with several other devices in the family, including the ADF4110, ADF4111, ADF4112, ADF4113, ADF4106, ADF4153, ADF4154, and ADF4156. This compatibility allows for potential board-level upgrades or substitutions within designs utilizing these specific form factors.

Replacement Considerations

Publicly confirmed substitute part numbers include ADF4110, ADF4111, ADF4112, ADF4113, ADF4106, ADF4153, ADF4154, and ADF4156 due to pin compatibility. Verify functional differences such as maximum RF frequency and modulus size before substitution.