AD8138ARM-REEL7

Overview

The AD8138ARM-REEL7 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, a slew rate of 1150 V/µs, and fast settling to 0.01% in 16 ns. The device offers low harmonic distortion with -94 dBc SFDR at 5 MHz and -85 dBc at 20 MHz. It operates on a wide supply range from +3 V to ±5 V with low power consumption of 90 mW at 5 V.

Feature Summary

• Provides easy single-ended-to-differential conversion with adjustable output common-mode voltage via the VOCM pin.
• Features unique internal feedback for balanced output gain and phase matching, suppressing even-order harmonics.
• Delivers low harmonic distortion suitable for driving state-of-the-art 10-bit to 16-bit converters at high frequencies.

Applications

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

Procurement Notes

Verify the specific REEL7 suffix against the manufacturer's current ordering guide to confirm packaging quantity and tape-and-reel specifications. Ensure the MSOP-8 package variant matches the design footprint requirements. Cross-reference the RoHS compliance status and lead-free finish details with the latest datasheet revision G documentation before finalizing procurement.

Selection Notes

Select this component when high linearity and wide bandwidth are required for differential signal processing. The AD8138 simplifies design by eliminating the need for external transformers while preserving DC information. Its internal common-mode feedback ensures precise output balancing without requiring tightly matched external resistors, making it ideal for precision data acquisition systems.

Part Context

The AD8138 represents a significant advancement over traditional op amps for differential signal processing. Manufactured on Analog Devices' proprietary XFCB bipolar process, it combines the ease of use of an op amp with dedicated differential output capabilities. This architecture allows for direct driving of high-speed ADCs while maintaining excellent dynamic performance and low noise characteristics.

Replacement Considerations

Consult the official Analog Devices AD8138 datasheet Ordering Guide for confirmed substitute part numbers. Verify compatibility regarding package type, electrical specifications, and thermal resistance before implementing any alternative components in the design.

FAQ

How does the AD8138 handle output common-mode voltage?

The output common-mode level is adjustable by applying a voltage to the VOCM pin. The internal common-mode feedback forces the output common-mode voltage to equal the voltage applied to the VOCM input, allowing for easy level-shifting for single-supply ADCs.

What is the typical offset voltage of the AD8138?

The AD8138 has a typical offset voltage of 1 mV, with a maximum variation of ±4 µV/°C across the operating temperature range.