ADP7157ARDZ-04-R7

Overview

The ADP7157ARDZ-04-R7 is an adjustable linear regulator from Analog Devices designed for RF applications. It operates with an input voltage range of 2.3 V to 5.5 V and delivers up to 1.2 A of output current. The device provides an adjustable output voltage range of 1.2 V to 3.3 V, featuring ultralow noise characteristics with a typical output noise of 0.9 µV rms (100 Hz to 100 kHz) and a noise spectral density of 1.7 nV/√Hz (10 kHz to 1 MHz). It achieves high power supply rejection ratios, reaching 82 dB from 1 kHz to 100 kHz at VIN = 3.8 V and VOUT = 3.3 V. The regulator maintains stability with only a 10 µF ceramic output capacitor and includes precision enable functionality.

Feature Summary

• Ultralow noise architecture optimized for sensitive radio frequency circuits
• High power supply rejection ratio ensuring stable operation under varying load conditions
• Precision enable pin allowing precise control over regulator startup and shutdown states
• Stable performance with minimal external components using standard ceramic capacitors

Applications

• Phase-locked loops (PLLs)
• Voltage controlled oscillators (VCOs)
• PLLs with integrated VCOs
• Backhaul and microwave links

Procurement Notes

Verify the specific -04 suffix designation confirms the 1.2 V to 3.3 V adjustable output range before procurement. Confirm package type matches design requirements, as this part number corresponds to the SOIC-8 variant. Check manufacturer documentation for current lifecycle status and availability constraints. Ensure application circuitry supports the specified input and output voltage parameters.

Selection Notes

Select this component when designing systems requiring low noise regulation for RF signals within a 2.3 V to 5.5 V input range. The -04 model specifically targets applications needing outputs up to 3.3 V while maintaining high PSRR. Consider thermal dissipation capabilities if operating near maximum load currents. Verify that the required output voltage falls within the 1.2 V to 3.3 V adjustable window defined by the resistor divider network.

Part Context

This device belongs to the ADP7157 family of ultralow noise linear regulators. The family includes variants optimized for different input-to-output voltage relationships to minimize power dissipation. The ADP7157 series is distinct from the ADM715x series, which typically offers lower current ratings or fixed output options. This specific part integrates a P-channel MOSFET pass transistor controlled by an error amplifier for precise regulation.

Replacement Considerations

Consult the manufacturer's ordering guide for direct equivalents within the ADP7157 series. Alternative models may offer different output voltage ranges or package types. Verify compatibility regarding pin configurations and electrical specifications before substitution.