AD8138ARZR7 Analog Devices, AD8138ARZR7 Datasheet

AD8138ARZR7

Manufacturer Part Number

AD8138ARZR7

Description

SOP8

Manufacturer

Analog Devices

Datasheet

1.AD8138ARZR7.pdf (24 pages)

Specifications of AD8138ARZR7

Date_code

08+

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FEATURES

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

Adjustable output common-mode voltage

Externally adjustable gain

Low harmonic distortion

−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

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 ADI’s proprietary 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 feed-back circuit also minimizes any gain error that

would be associated with the mismatches in the external gain

setting resistors.

The AD8138’s differential output helps balance the input to

differential ADCs, maximizing the performance of the ADC.

Rev. F

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

−94 dBc SFDR @ 5 MHz

−85 dBc SFDR @ 20 MHz

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

The AD8138 eliminates the need for a transformer with high

performance ADCs, preserving the low frequency and dc infor-

mation. The common-mode level of the differential output is

adjustable by a voltage on the V

input signals for driving single-supply ADCs. Fast overload

recovery preserves sampling accuracy.

The AD8138 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’s high bandwidth and IP3 also

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

signal chains. The AD8138 offset and dynamic performance

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

data acquisition applications.

The AD8138 is available in both SOIC and MSOP packages for

operation over −40°C to +85°C temperatures.

499Ω

TYPICAL APPLICATION CIRCUIT

OCM

Differential ADC Driver

–

AD8138

+OUT

PIN CONFIGURATION

OCM

–IN

V+

499Ω

NC = NO CONNECT

AD8138

Figure 1.

Figure 2.

OCM

Low Distortion

AIN

pin, easily level-shifting the

AVSS

AVDD

+IN

V–

–OUT

ADC

DVDD

REF

AD8138

www.analog.com

DIGITAL

OUTPUTS

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