REV. 0

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a

AD8022

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., 1999

Dual High-Speed

Low-Noise Op Amps

FUNCTIONAL BLOCK DIAGRAM

8

7

6

5

1

2

3

4

OUT1

–IN1

+IN1

OUT2

–IN2

+IN2

AD8022

–

+

–

+

FEATURES

Low-Noise Amplifiers Provide Low Noise and Low

Distortion, Ideal for xDSL Modem Receiver

+5 V to

12 V Voltage Supply

Low-Power Consumption

4.0 mA/Amp (Typ) Supply Current

Voltage Feedback Amplifiers

Low Noise and Distortion

2.5 nV/

√Hz Voltage Noise @ 100 kHz

SFDR –95 dBc @ 1 MHz

MTPR < –66 dBc

High Speed

120 MHz Bandwidth (–3 dB), G = 1

50 V/ s Slew Rate

Low-Offset Voltage, 1.5 mV Typical

APPLICATIONS

ADSL, VDSL, HDSL, and Proprietary xDSL Systems

Low-Noise Instrumentation Front End

Ultrasound Preamp

PRODUCT DESCRIPTION

The AD8022 consists of two low-noise, high-speed, voltage feed-

back amplifiers. Both inputs add only 2.5 nV/

√Hz of voltage

noise. These dual amplifiers provide wideband, low-distortion

performance, with high-output current optimized for stability

when driving capacitive loads. Operating from +5 V to

±12 V

supplies, the AD8022 typically consumes only 4.0 mA/Amp

quiescent current. The AD8022 is available in both an 8-lead

microSOIC and an 8-lead SOIC package. Fast overvoltage

recovery and wide bandwidth make the AD8022 ideal as the

receive channel front end to an ADSL, VDSL or proprietary

xDSL transceiver design.

Low-noise receive amplifiers in the AD8022 are independent

voltage feedback amplifiers and can be configured as the differ-

ential receiver from the line transformer or as independent active

filters in an xDSL line interface circuit.

FREQUENCY – Hz

3.0

10k

2.5

2.0

1.5

1.0

0.5

0

100k

1M

VOLTAGE NOISE, nV

CURRENT NOISE, pA

Figure 1. Current and Voltage Noise vs. Frequency