AD8138AR-REEL

Overview

The AD8138AR-REEL 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 delivers fast settling to 0.01% in 16 ns and exhibits low harmonic distortion, with SFDR of -94 dBc at 5 MHz and -85 dBc at 20 MHz. It operates on a wide supply range from +3 V to ±5 V, consuming 90 mW on a 5 V supply. The input voltage noise is 5 nV/√Hz, and the typical offset voltage is 1 mV.

Feature Summary

• Provides easy single-ended-to-differential conversion with adjustable output common-mode voltage via the VOCM pin.
• Features externally adjustable gain and internal feedback for balanced output gain and phase matching.
• Delivers low harmonic distortion suitable for driving high-speed analog-to-digital converters.
• Offers fast overdrive recovery and high slew rate for accurate signal processing.

Applications

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

Procurement Notes

Verify the specific package type and temperature grade against the datasheet requirements before procurement. Ensure the ordering suffix matches the desired reel quantity and packaging format. Confirm that the component meets the specified operating temperature range of -40°C to +85°C for your application environment. Cross-reference the part number with official Analog Devices documentation to avoid counterfeit or obsolete stock.

Selection Notes

Select this component when low distortion and high bandwidth are critical for differential signal processing. It is suitable for applications requiring single-ended to differential conversion without transformers. Consider the power consumption and supply voltage range relative to system constraints. Evaluate the noise performance and settling time against the requirements of the connected ADC or downstream circuitry.

Part Context

The AD8138 is designed as an advancement over traditional op amps for differential signal processing. Manufactured on the proprietary ADI XFCB bipolar process, it simplifies driving differential ADCs by eliminating the need for transformers. The device preserves low-frequency and DC information while providing balanced outputs. It is available in 8-Lead SOIC and MSOP packages.

Replacement Considerations

Consult the official Analog Devices replacement guide for verified substitute part numbers. Ensure any alternative component matches the pinout, bandwidth, and distortion specifications. Verify compatibility with existing PCB layouts and thermal requirements.

FAQ

How is the output common-mode voltage controlled?

The output common-mode voltage is adjusted by applying a voltage to the VOCM pin, which sets the dc bias level on the outputs with a 1:1 ratio.

What is the maximum supply voltage range?

The AD8138 operates on a wide supply range from +3 V to ±5 V.