ADF4157BRUZ

Overview

The ADF4157BRUZ is a high-resolution fractional-N frequency synthesizer from Analog Devices Inc., operating with an RF bandwidth up to 6 GHz. 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. Powered by 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 extending to 6 GHz with 25-bit fixed modulus for subhertz resolution
• Integrated third-order Σ-Δ fractional interpolator and programmable charge pump
• Cycle slip reduction (CSR) circuitry for accelerated lock times without loop filter modification
• Digital lock detect and power-down mode with 10 µA typical current consumption

Applications

• Satellite communications terminals
• Radar equipment
• Instrumentation equipment
• Personal mobile radio (PMR)
• Base stations for mobile radio

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and temperature grade. Confirm that the required voltage levels for AVDD, DVDD, and VP align with system design constraints before procurement. Cross-reference the pinout configuration to match the intended PCB footprint, as LFCSP variants may exist within the same family.

Selection Notes

Select this component when subhertz frequency resolution is required at RF frequencies up to 6 GHz. Ensure the external reference input frequency falls within the 10 MHz to 300 MHz range and that the PFD frequency does not exceed 32 MHz. Verify that the available charge pump current settings are sufficient for the external VCO tuning requirements and that the loop filter design accommodates the CSR functionality for optimal lock performance.

Part Context

The ADF4157BRUZ belongs to the ADF41xx series of fractional-N PLL frequency synthesizers. It shares pin compatibility with several related models, including the ADF4110, ADF4111, ADF4112, ADF4113, ADF4106, ADF4153, ADF4154, and ADF4156. This pin compatibility allows for potential board-level upgrades or replacements within designs utilizing these specific synthesizers, provided the electrical specifications meet the application needs.

Replacement Considerations

Publicly confirmed pin-compatible substitutes include the ADF4110, ADF4111, ADF4112, ADF4113, ADF4106, ADF4153, ADF4154, and ADF4156. Verify that the replacement part meets the specific RF bandwidth and resolution requirements of the original design.