AD8138ARZ

Product Summary

The AD8138 is a major advancement over op amps fordifferential signal processing. The AD8138 can be used as asingle-ended-to-differential amplifier or as a differential-to-differential amplifier. The AD8138 is as easy to use as an opamp and greatly simplifies differential signal amplification anddriving. Manufactured on ADI’s proprietary XFCB bipolarprocess, the AD8138 has a ?3 dB bandwidth of 320 MHz anddelivers a differential signal with the lowest harmonic distortionavailable in a differential amplifier. The AD8138 has a uniqueinternal feedback feature that provides balanced output gainand phase matching, suppressing even order harmonics. Theinternal feed-back circuit also minimizes any gain error thatwould be associated with the mismatches in the external gainsetting resistors.The AD8138’s differential output helps balance the input todifferential ADCs, maximizing the performance of the ADC.

The AD8138 eliminates the need for a transformer with highperformance ADCs, preserving the low frequency and dc infor-mation. The common-mode level of the differential output isadjustable by a voltage on the VOCM pin, easily level-shifting theinput signals for driving single-supply ADCs. Fast overloadrecovery preserves sampling accuracy.The AD8138 distortion performance makes it an ideal ADCdriver for communication systems, with distortion performancegood enough to drive state-of-the-art 10-bit to 16-bit convertersat high frequencies. The AD8138’s high bandwidth and IP3 alsomake it appropriate for use as a gain block in IF and basebandsignal chains. The AD8138 offset and dynamic performancemakes it well suited for a wide variety of signal processing anddata acquisition applications.The AD8138 is available in both SOIC and MSOP packages foroperation over ?40°C to +85°C temperatures

Features

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

Adjustable output common-mode voltage

Externally adjustable gainLow harmonic distortion

?94 dBc SFDR @ 5 MHz

?85 dBc SFDR @ 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/√Hz1 mV 

typical offset voltageWide 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

Diagrams