AD8138ARMZ

Overview

The AD8138ARMZ is a low distortion differential ADC driver manufactured by Analog Devices Inc. in an 8-lead MSOP package. It features a -3 dB bandwidth of 320 MHz at G = +1 and a slew rate of 1150 V/µs. The device settles to 0.01% in 16 ns with an overdrive recovery time of 4 ns. Input voltage noise is 5 nV/√Hz, and typical offset voltage is 1 mV. Operating supply range spans from +3 V to ±5 V, consuming 90 mW at 5 V. Harmonic distortion reaches -94 dBc SFDR at 5 MHz.

Feature Summary

• Internal feedback architecture provides balanced output gain and phase matching while suppressing even-order harmonics.
• Adjustable output common-mode voltage via the VOCM pin enables easy level-shifting for single-supply ADCs.
• External resistors allow configurable closed-loop gain without compromising output balance.

Applications

• ADC drivers
• Single-ended-to-differential converters
• IF and baseband gain blocks

Procurement Notes

Verify the specific ordering suffix 'ARMZ' corresponds to the 8-lead MSOP package variant rather than the SOIC version. Confirm RoHS compliance status through official documentation as required for procurement. Ensure the component matches the intended thermal dissipation requirements for the MSOP footprint during integration.

Selection Notes

Select this component when high linearity and low harmonic distortion are critical for driving high-performance analog-to-digital converters. The internal common-mode feedback simplifies design compared to discrete solutions using multiple op amps. Consider the MSOP package constraints regarding thermal resistance and board space availability.

Part Context

This part belongs to the AD8138 family of differential amplifiers designed for signal processing applications. It utilizes Analog Devices' proprietary XFCB bipolar process to achieve high speed and low power consumption. The device serves as a direct replacement for transformer-based coupling in many signal chains, preserving DC information.

Replacement Considerations

Public confirmed substitute part numbers: AD8138ARZ (SOIC package), AD8138ARMZ-REEL (Reel packaging).