ADP7118ARDZ-1.8

Overview

The ADP7118ARDZ-1.8 is a CMOS low dropout linear regulator manufactured by Analog Devices Inc. It operates from an input voltage range of 2.7 V to 20 V and provides up to 200 mA of output current. The device delivers a fixed 1.8 V output with an initial accuracy of ±0.8%. It features ultralow noise of 11 µV rms, high power supply rejection ratios reaching 88 dB at 10 kHz, and a typical quiescent current of 50 µA. The regulator is housed in an 8-lead SOIC package.

Feature Summary

• Ultralow output noise of 11 µV rms independent of the fixed output voltage setting
• High power supply rejection ratio providing effective filtering across various frequencies
• Capable of driving up to 200 mA load current while maintaining stability with small ceramic capacitors
• Includes precision enable functionality for controlled power sequencing

Applications

• Powering analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuits
• Supplying precision amplifiers in measurement systems
• Providing stable bias for voltage-controlled oscillators (VCOs)
• Supporting communications and infrastructure equipment
• Powering medical and healthcare instrumentation devices

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm that the specific ordering suffix matches the required package type and output voltage configuration. Ensure compliance with RoHS directives and check for automotive qualification status if applicable to the target environment. Review datasheet specifications for absolute maximum ratings before integration.

Selection Notes

Select this regulator when designing circuits requiring high line regulation and minimal output ripple. Consider the thermal resistance characteristics of the 8-lead SOIC package for heat dissipation requirements. Evaluate the need for external soft-start capacitance if slower startup times are desired. Verify that the minimum input voltage requirement aligns with the available supply rails.

Part Context

This component belongs to the ADP7118 family of high-voltage LDO regulators designed for sensitive analog applications. The series offers multiple fixed output voltages and adjustable configurations. It utilizes a proprietary architecture to achieve excellent transient response without requiring large bulk capacitors, making it suitable for space-constrained designs.

Replacement Considerations

Direct replacements include other variants within the ADP7118 family such as the ADP7118AUJZ-1.8-R7 or ADP7118ARDZ-3.3. Cross-reference pinouts and thermal performance metrics to ensure compatibility with existing PCB layouts.