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.