CONNECTION DIAGRAMS

8-Lead Plastic Mini-DIP (N),

Cerdip (Q) and SOIC (R) Packages

TOP VIEW

(Not to Scale)

8

7

6

5

1

2

3

4

OFFSET NULL

AD829

–IN

+IN

OUTPUT

OFFSET NULL

20-Lead LCC Pinout

20 19

1

2

3

18

14

15

16

17

4

5

6

7

8

9 1011 1213

TOP VIEW

(Not to Scale)

AD829

NC

+V

NC

OUTPUT

NC

NC = NO CONNECT

NC

–IN

NC

+IN

NC

REV. E

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

High-Speed, Low-Noise

Video Op Amp

AD829

FEATURES

High Speed

120 MHz Bandwidth, Gain = –1

230 V/ s Slew Rate

90 ns Settling Time to 0.1%

Ideal for Video Applications

0.02% Differential Gain

0.04 Differential Phase

Low Noise

1.7 nV/

√Hz Input Voltage Noise

1.5 pA/

√Hz Input Current Noise

Excellent DC Precision

1 mV max Input Offset Voltage (Over Temp)

0.3

V/ C Input Offset Drift

Flexible Operation

Specified for

5 V to

15 V Operation

3 V Output Swing into a 150

Load

External Compensation for Gains 1 to 20

5 mA Supply Current

Available in Tape and Reel in Accordance with

EIA-481A Standard

PRODUCT DESCRIPTION

The AD829 is a low noise (1.7 nV/

√Hz), high speed op amp

with custom compensation that provides the user with gains

from

±1 to ±20 while maintaining a bandwidth greater than

50 MHz. The AD829’s 0.04

° differential phase and 0.02%

differential gain performance at 3.58 MHz and 4.43 MHz,

driving reverse-terminated 50

Ω or 75 Ω cables, makes it ideally

suited for professional video applications. The AD829 achieves

its 230 V/

µs uncompensated slew rate and 750 MHz gain band-

width product while requiring only 5 mA of current from the

power supplies.

The AD829’s external compensation pin gives it exceptional

versatility. For example, compensation can be selected to opti-

mize the bandwidth for a given load and power supply voltage.

As a gain-of-two line driver, the –3 dB bandwidth can be in-

creased to 95 MHz at the expense of 1 dB of peaking. In addi-

tion, the AD829’s output can also be clamped at its external

compensation pin.

The AD829 has excellent dc performance. It offers a minimum

open-loop gain of 30 V/mV into loads as low as 500

Ω, low

input voltage noise of 1.7 nV/

√Hz, and a low input offset volt-

age of 1 mV maximum. Common-mode rejection and power

supply rejection ratios are both 120 dB.

The AD829 is also useful in multichannel, high speed data

conversion where its fast (90 ns to 0.1%) settling time is of

importance. In such applications, the AD829 serves as an input

buffer for 8-to-10-bit A/D converters and as an output I/V con-

verter for high speed D/A converters.

The AD829 provides many of the same advantages that a trans-

impedance amplifier offers, while operating as a traditional

voltage feedback amplifier. A bandwidth greater than 50 MHz

can be maintained for a range of gains by changing the external

compensation capacitor. The AD829 and the transimpedance

amplifier are both unity gain stable and provide similar voltage

noise performance (1.7 nV/

√Hz). However, the current noise of

the AD829 (1.5 pA/

√Hz) is less than 10% of the noise of trans-

impedance amps. Furthermore, the inputs of the AD829 are

symmetrical.

PRODUCT HIGHLIGHTS

1. Input voltage noise of 2 nV/

√Hz, current noise of 1.5 pA/

√Hz and 50 MHz bandwidth, for gains of 1 to 20, make the

AD829 an ideal preamp.

2. Differential phase error of 0.04

° and a 0.02% differential

gain error, at the 3.58 MHz NTSC and 4.43 MHz PAL and

SECAM color subcarrier frequencies, make it an outstanding

video performer for driving reverse-terminated 50

Ω and

75

Ω cables to ±1 V (at their terminated end).

3. The AD829 can drive heavy capacitive loads.

4. Performance is fully specified for operation from

±5 V to

±15 V supplies.

5. Available in plastic, cerdip, and small outline packages.

Chips and MIL-STD-883B parts are also available.

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