GENERAL DESCRIPTION

The AD8138 is a major advancement over op amps for differential signal processing. The AD8138 can be used as a single-ended-to-differential amplifier or as a differential-to-differential amplifier. The AD8138 is as easy to use as an op amp and greatly simplifies differential signal amplification and driving. Manufactured on the proprietary ADI XFCB bipolar process, the AD8138 has a −3 dB bandwidth of 320 MHz and delivers a differential signal with the lowest harmonic distortion available in a differential amplifier. The AD8138 has a unique internal feedback feature that provides balanced output gain and phase matching, suppressing even order harmonics. The internal feedback circuit also minimizes any gain error that would be associated with the mismatches in the external gain setting resistors.

FEATURES

Easy to use, single-ended-to-differential conversion

Adjustable output common-mode voltage

Externally adjustable gain

Low harmonic distortion

−94 dBc SFDR at 5 MHz

−85 dBc SFDR at 20 MHz

−3 dB bandwidth of 320 MHz, G = +1

Fast settling to 0.01 of 16 ns

Slew rate 1150 V/µs

Fast overdrive recovery of 4 ns

Low input voltage noise of 5 nV/√Hz

1 mV typical offset voltage

Wide supply range +3 V to ±5 V

Low power 90 mW on 5 V

0.1 dB gain flatness to 40 MHz

Available in 8-Lead SOIC and MSOP packages

APPLICATIONS

ADC drivers

Single-ended-to-differential converters

IF and baseband gain blocks

Differential buffers

Line drivers