REV. 0

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

AD8132

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

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2000

Low-Cost, High-Speed

Differential Amplifier

FUNCTIONAL BLOCK DIAGRAM

AD8132

+

1

2

3

4

NC = NO CONNECT

–IN

+IN

NC

V+

V–

+OUT

–OUT

8

7

6

5

FEATURES

High Speed

350 MHz –3 dB Bandwidth

1200 V/ s Slew rate

Resistor-Settable Gain

Internal Common-Mode Feedback to Improve Gain

and Phase Balance –68 dB @ 10 MHz

Separate Input to Set the Common-Mode Output

Voltage

Low Distortion –99 dBc SFDR @ 5 MHz 800

Load

Low Power 10.7 mA @ 5 V

Power Supply Range +2.7 V to

5.5 V

APPLICATIONS

Low Power Differential ADC Driver

Differential Gain and Differential Filtering

Video Line Driver

Differential In/Out Level-Shifting

Single-Ended Input to Differential Output Driver

Active Transformer

GENERAL DESCRIPTION

The AD8132 is a low-cost differential or single-ended input to

differential output amplifier with resistor-settable gain. The

AD8132 is a major advancement over op amps for driving differ-

ential input ADCs or for driving signals over long lines. The

AD8132 has a unique internal feedback feature that provides

output gain and phase matching balanced to –68 dB at 10 MHz,

suppressing harmonics, and reducing radiated EMI.

Manufactured on ADI’s next generation of XFCB bipolar pro-

cess, the AD8132 has a –3 dB bandwidth of 350 MHz and

delivers a differential signal with –99 dBc SFDR at 5 MHz,

despite its low cost. The AD8132 eliminates the need for a

transformer with high-performance ADCs, preserving the low

frequency and dc information. The common-mode level of the

pin, easily level-shifting the input signals for driving single supply

ADCs. Fast overload recovery preserves sampling accuracy.

The AD8132 can also be used as a differential driver for the

transmission of high-speed signals over low-cost twisted pair or

coaxial cables. The feedback network can be adjusted to boost

the high-frequency components of the signal. The AD8132 can

be used for either analog or digital video signals or for other high-

speed data transmission. The AD8132 is capable of driving either

cat3 or cat5 twisted pair or coaxial with minimal line attenu-

ation. The AD8132 has considerable cost and performance

improvements over discrete line driver solutions.

Differential signal processing reduces the effects of ground noise

which plagues ground referenced systems. The AD8132 can be

used for differential signal processing (gain and filtering) through-

out a signal chain, easily simplifying the conversion between

differential and single-ended components.

The AD8132 is available in both SOIC and

µSOIC packages for

operation over –40

°C to +85°C temperatures.

FREQUENCY – MHz

6

1

3

0

–3

–6

–9

–12

10

100

1k

G = 1

Figure 1. Large Signal Frequency Response