AD8138ARZ-R7

Overview

The AD8138ARZ-R7 is a low distortion differential ADC driver manufactured by Analog Devices Inc. in an 8-lead SOIC 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 offset voltage is typically 1 mV, and input voltage noise is 5 nV/√Hz. Operating supply range spans from +3 V to ±5 V, consuming 90 mW at 5 V.

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 applications.
• Externally adjustable gain allows flexible configuration for various signal processing requirements.

Applications

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

Procurement Notes

Verify the specific ordering suffix R7 corresponds to reel packaging when sourcing. Confirm the manufacturer is Analog Devices Inc. Ensure the component matches the AD8138 series specifications. Check RoHS compliance status as indicated in official documentation. Validate the package type is 8-Lead SOIC for physical compatibility.

Selection Notes

Select this component for high-speed differential signal processing where low harmonic distortion is critical. It serves as a direct replacement for transformer-based solutions, preserving DC and low-frequency information. Consider the 320 MHz bandwidth and fast settling times for driving high-performance ADCs up to 16 bits.

Part Context

This part belongs to the AD8138 family of low distortion differential amplifiers. Manufactured on the proprietary XFCB bipolar process, it simplifies differential signal amplification compared to standard op amps. The series supports both single-ended-to-differential and differential-to-differential conversion modes.

Replacement Considerations

AD8138ARZ

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 allows adjustment of the output common-mode voltage. This facilitates level-shifting the input signals to drive single-supply ADCs without affecting the differential output voltage.