FUNCTIONAL BLOCK DIAGRAM

TOP VIEW

(Not to Scale)

AD815

13

16

15

14

24

23

22

21

20

19

18

17

12

11

10

9

8

1

2

3

4

7

6

5

NC = NO CONNECT

NC

NC

NC

NC

NC

NC

NC

NC

+IN1

–IN1

–IN2

+IN2

OUT1

OUT2

*HEAT TABS ARE CONNECTED TO THE POSITIVE SUPPLY.

THERMAL

HEAT TABS

THERMAL

HEAT TABS

REV. C

a

High Output Current

Differential Driver

AD815

GENERAL DESCRIPTION

The AD815 consists of two high speed amplifiers capable of

supplying a minimum of 500 mA. They are typically configured

as a differential driver enabling an output signal of 40 V p-p on

±15 V supplies. This can be increased further with the use of a

coupling transformer with a greater than 1:1 turns ratio. The

low harmonic distortion of –66 dB @ 1 MHz into 200

Ω

FEATURES

Flexible Configuration

Differential Input and Output Driver

or Two Single-Ended Drivers

Industrial Temperature Range

High Output Power

Thermally Enhanced SOIC

Low Distortion

(6 Back-Terminated Video Loads)

High Speed

120 MHz Bandwidth (–3 dB)

900 V/ s Differential Slew Rate

70 ns Settling Time to 0.1%

Thermal Shutdown

APPLICATIONS

ADSL, HDSL, and VDSL Line Interface Driver

Coil or Transformer Driver

CRT Convergence and Astigmatism Adjustment

Video Distribution Amp

Twisted Pair Cable Driver

FREQUENCY – Hz

–40

–50

–110

100

10M

1k

10k

100k

1M

–60

–70

–80

–90

–100

G = +10

(DIFFERENTIAL)

(DIFFERENTIAL)

Figure 1. Total Harmonic Distortion vs. Frequency

AMP1

+15V

–15V

120

110

499

40Vp-p

4Vp-p

1/2

AD815

1/2

AD815

G = +10

100

100

AMP2

40Vp-p

1:2

TRANSFORMER

499

Figure 2. Subscriber Line Differential Driver

combined with the wide bandwidth and high current drive make

the differential driver ideal for communication applications such

as subscriber line interfaces for ADSL, HDSL and VDSL.

The AD815 differential slew rate of 900 V/

µs and high load drive

are suitable for fast dynamic control of coils or transformers,

and the video performance of 0.05% and 0.45

° differential gain

and phase into a load of 25

Ω enable up to 12 back-terminated

loads to be driven.

The 24-lead SOIC (RB) is capable of driving 26 dBm for full

rate ADSL with proper heat sinking.

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. 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.

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

Tel: 781/329-4700

www.analog.com

Fax: 781/461-3113

© 2005 Analog Devices, Inc. All rights reserved.