ADF4157BRUZ-RL7

Overview

The ADF4157BRUZ-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 6 GHz. The device integrates a low-noise digital phase frequency detector (PFD), a precision charge pump with programmable currents, and a Σ-Δ based fractional interpolator. Operating on a 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 16-TSSOP package.

Feature Summary

• RF bandwidth up to 6 GHz with 25-bit fixed modulus for subhertz resolution
• Cycle slip reduction circuitry enables faster lock times without loop filter modifications
• Programmable charge pump currents ranging from 312.5 µA to 5 mA via RSET
• Digital lock detect and power-down mode for system efficiency

Applications

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

Procurement Notes

Verify the ordering suffix -RL7 corresponds to tape and reel packaging when sourcing. Confirm the B version industrial temperature range (-40°C to +85°C) matches application requirements. Ensure the 16-TSSOP package footprint aligns with PCB design constraints. Cross-reference the specific revision D datasheet for accurate electrical specifications during procurement validation.

Selection Notes

Select this component for applications requiring high spectral purity and fine frequency steps up to 6 GHz. The separate VP pin allows extended tuning voltage ranges up to 5.5 V, accommodating various VCO requirements. Ensure the reference input frequency stays within the 10 MHz to 300 MHz range and that the PFD frequency does not exceed 32 MHz for optimal performance.

Part Context

The ADF4157 is part of the ADF41xx family of fractional-N synthesizers. It is pin-compatible with models such as the ADF4110, ADF4111, ADF4112, ADF4113, ADF4106, ADF4153, ADF4154, and ADF4156. This compatibility facilitates direct upgrades or replacements in existing designs requiring higher frequency coverage or improved resolution.

Replacement Considerations

Pin-compatible substitutes include ADF4153, ADF4154, ADF4156, ADF4110, ADF4111, ADF4112, ADF4113, and ADF4106. Verify that the substitute model meets the specific RF bandwidth and resolution requirements of the original design before implementation.