ADF4157BCPZ

Overview

The ADF4157BCPZ 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 based 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 component is housed in a 20-lead LFCSP package.

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
• Base stations for mobile radio
• Wireless handsets

Procurement Notes

Verify the specific B version suffix indicates the industrial temperature range of -40°C to +85°C. Confirm the LFCSP-20 package type matches the design footprint requirements. Ensure the ordering code corresponds to the tray packaging format specified in the manufacturer's guide. Cross-reference the datasheet revision D specifications against current inventory data sheets.

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 for applications requiring VCO tuning voltages exceeding the standard 3.3 V logic supply. Ensure 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 ADF4157BCPZ belongs to the ADF4157 family of fractional-N synthesizers. It is pin-compatible with several other Analog Devices synthesizers, including the ADF4110, ADF4111, ADF4112, ADF4113, ADF4106, ADF4153, ADF4154, and ADF4156. This compatibility allows for direct replacement in existing designs utilizing those parts, provided the electrical specifications meet the system requirements.

Replacement Considerations

Public confirmed substitute part numbers include ADF4110, ADF4111, ADF4112, ADF4113, ADF4106, ADF4153, ADF4154, and ADF4156 due to pin compatibility.