ADM7155ARDZ-04-R7

Overview

The ADM7155ARDZ-04-R7 is an adjustable linear regulator from Analog Devices, operating within a 2.3 V to 5.5 V input voltage range and delivering up to 600 mA of load current. It provides an output voltage range of 1.2 V to 3.4 V with ultralow noise characteristics, including 1.6 μV rms integrated noise from 10 Hz to 100 kHz and a spectral density of 1.5 nV/√Hz from 10 kHz to 1 MHz. The device features high power supply rejection ratio (PSRR) exceeding 90 dB from 200 Hz to 200 kHz and maintains stability with only a 10 μF ceramic output capacitor.

Feature Summary

• Ultralow noise performance optimized for RF applications
• High power supply rejection ratio across wide frequency ranges
• Precision enable pin for controlled startup and shutdown
• Stable operation with small ceramic output capacitors

Applications

• PLLs and VCOs requiring low-noise regulation
• Communications infrastructure systems
• Backhaul and microwave links

Procurement Notes

Verify the specific -04 suffix configuration against the official datasheet to ensure compatibility with the required input and output voltage headroom. Confirm package type and thermal requirements match the target PCB layout. Check for moisture sensitivity levels and storage conditions prior to assembly.

Selection Notes

Select this model when input voltages are higher than lower-output variants, optimizing power dissipation. Ensure the application requires adjustable output settings between 1.2 V and 3.4 V. Verify that the 600 mA current capability meets peak load demands while maintaining thermal limits within the chosen package.

Part Context

This component belongs to the ADM7155 series of ultra-low noise LDO regulators designed for sensitive analog and RF circuits. It shares architectural similarities with fixed-output models like the ADM7154 but offers programmable voltage via external resistors. The -04 variant specifically targets scenarios with higher input-to-output differentials.

Replacement Considerations

ADM7155ACPZ-04-R7