FEATURES

Adjustable output common-mode voltage

Low 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

Fast overdrive recovery of 4 ns

Low input voltage noise of 5 nV/√Hz

Low power 90 mW on 5 V

ENHANCED PRODUCT FEATURES

Supports defense and aerospace applications (AQEC)

Extended temperature range −55ºC to +105°C

Controlled manufacturing baseline

One assembly/test site

One fabrication site

Enhanced product change notification

Qualification data available on request

APPLICATIONS

ADC drivers

Single-ended-to-differential converters

IF and baseband gain blocks

Differential buffers

Line drivers

GENERAL DESCRIPTION

The AD8138-EP is a major advancement over op amps for

differential signal processing. The AD8138-EP can be used

as a single-ended-to-differential amplifier or as a differential-todifferential amplifier. The AD8138-EP is as easy to use as an op

amp and greatly simplifies differential signal amplification and

driving. Manufactured on Analog Devices, Inc., proprietary XFCB

bipolar process, the AD8138-EP 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-EP 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.

The AD8138-EP’s differential output helps balance the input to

the differential ADCs, maximizing the performance of the ADC.

The AD8138-EP eliminates the need for a transformer with

high performance ADCs, preserving the low frequency and dc

information. The common-mode level of the differential output

is adjustable by a voltage on the VOCM pin, easily level-shifting

the input signals for driving single-supply ADCs. Fast overload

recovery preserves sampling accuracy.

The AD8138-EP distortion performance makes it an ideal ADC

driver for communication systems, with distortion performance

good enough to drive state-of-the-art 10-bit to 16-bit converters

at high frequencies. The AD8138-EP’s high bandwidth and IP3 also

make it appropriate for use as a gain block in IF and baseband

signal chains. The AD8138-EP offset and dynamic performance

make it well suited for a wide variety of signal processing and

data acquisition applications. The AD8138-EP is available in the

MSOP package for operation over −55°C to +105°C temperatures.

Full details about this enhanced product are available in the

AD8138 data sheet, which should be consulted in conjunction

with this data sheet.