AD8138AARMZ-RL

Overview

The AD8138AARMZ-RL is a low distortion differential ADC driver manufactured by Analog Devices Inc. It features a -3 dB bandwidth of 320 MHz at G = +1 and a slew rate of 1150 V/µs. The device operates on a supply voltage range from +3 V to ±5 V with a quiescent current of 20 mA, consuming 90 mW at 5 V. It provides fast settling time of 16 ns to 0.01% and overdrive recovery of 4 ns. Input offset voltage is typically 1 mV with input bias current of 7 µA. The component is housed in an 8-lead MSOP package.

Feature Summary

• Internal feedback architecture ensures balanced output gain and phase matching while suppressing even-order harmonics.
• Adjustable output common-mode voltage via the VOCM pin allows easy level-shifting for single-supply ADC applications.
• External resistors allow flexible closed-loop gain configuration for various signal processing needs.

Applications

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

Procurement Notes

Verify the specific ordering suffix RL indicates reel packaging when sourcing. Confirm the A variant specifications against the official datasheet as they may differ from standard versions. Ensure compatibility with the required MSOP-8 footprint and thermal management requirements for the target PCB layout.

Selection Notes

Select this component for high-frequency applications requiring low harmonic distortion and precise differential signaling. Consider the 320 MHz bandwidth and 1150 V/µs slew rate for demanding signal chains. Evaluate the adjustable VOCM feature for systems requiring specific output common-mode levels without additional circuitry.

Part Context

This part belongs to the AD8138 series of differential amplifiers designed for driving analog-to-digital converters. It utilizes Analog Devices' proprietary XFCB bipolar process to achieve high performance. The series includes variants in SOIC and MSOP packages, catering to different space and thermal constraints in electronic designs.

Replacement Considerations

AD8138ARZ-RL

FAQ

How does the internal feedback mechanism affect harmonic distortion?

The unique internal feedback feature provides balanced output gain and phase matching, which suppresses even-order harmonics and minimizes gain errors associated with external resistor mismatches.

What is the function of the VOCM pin?

The VOCM pin sets the common-mode output voltage. Applying a DC voltage here forces the output common-mode level to match that voltage, facilitating level-shifting for single-supply ADCs.