REV. B

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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

500 mA Differential Driver and

Dual Low Noise (VF) Amplifiers

AD816*

FEATURES

Flexible Configuration

Two Low Noise Voltage Feedback Amplifiers with

High Current Drive, Ideal for ADSL Receivers or

Drivers for Low Impedance Loads such as CRT Coils

Two High Current Drive Amplifiers, Ideal for an ADSL

Differential Driver or Single Ended Drivers for Low

Impedance Loads such as CRT Coils

Thermal Overload Protection

CURRENT FEEDBACK AMPLIFIERS/DRIVERS

High Output Drive

26 dBm Differential Line Drive for ADSL Transmitters

@ 1 MHz

for DMT

Low Distortion

High Speed

120 MHz Bandwidth (–3 dB)

70 ns Settling Time to 0.1%

VOLTAGE FEEDBACK AMPLIFIERS/RECEIVERS

High Input Performance

4 nV/

√Hz Voltage Noise

15 mV Max Input Offset Voltage

Low Distortion

High Speed

100 MHz Bandwidth (–3 dB)

180 V/ s Slew Rate

High Output Drive

70 mA Output Current Drive

APPLICATIONS

ADSL, VDSL and HDSL Line Interface Driver and Receiver

CRT Convergence and Astigmatism Adjustment

Coil and Transformer Drivers

Composite Audio Amplifiers

FUNCTIONAL BLOCK DIAGRAM

OUT1 RECEIVER

–IN1 RECEIVER

+IN1 RECEIVER

+IN1 DRIVER

–IN1 DRIVER

OUT1 DRIVER

OUT2 RECEIVER

–IN2 DRIVER

+IN2 DRIVER

+IN2 RECEIVER

–IN2 RECEIVER

NC

TAB IS

NC = NO CONNECT

OUT2 DRIVER

B

A

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

PRODUCT DESCRIPTION

The AD816 consists of two high current drive and two low

noise amplifiers. These can be configured differentially for driv-

ing low impedance loads and receiving signals over twisted pair

cable or could be used independently for single ended driving

application such as correction circuits within high resolution

CRT Monitors.

The two high output drive amplifiers are capable of supplying

a minimum of 500 mA continuous output current and up to

1A peak output current, and when configured differentially,

40 V p-p differential output swing can be achieved on

±15 V

supplies into a load of 50

Ω. The drivers have 120 MHz of

bandwidth and 1,500 V/

µs of differential slew rate while

featuring total harmonic distortion of –68 dB at 1 MHz into a

100

Ω load, specifications required for high frequency telecom-

munication subscriber line drivers.

The low noise voltage feedback amplifiers are fully independent

and can be configured differentially for use as receiver amplifi-

ers within a subscriber line hybrid interface or individually for

signal conditioning or filtering. The low noise of 4 nV/

√Hz and

distortion of –68 dB at 1 MHz enable low level signals to be

resolved and amplified in the presence of large common-mode

voltages. 100 MHz of bandwidth and 180 V/

µs of slew rate

combined with a load drive capability of 70 mA enable these

amplifiers to drive passive filters and low inductance coils. The

AD816 has thermal overload protection for system reliability

and is available in low thermal resistance power packages. The

AD816 operates over the industrial temperature range (–40

°C

to +85

°C).

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