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

AD9630*

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

Tel: 617/329-4700

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

Fax: 617/326-8703

© Analog Devices, Inc., 1999

Low Distortion 750 MHz

Closed-Loop Buffer Amp

PIN CONFIGURATION

1

2

3

4

8

7

6

5

NC = NO CONNECT

AD9630

***

NC

**

INPUT

NC

OUTPUT

NOTE: FOR BEST SETTLING TIME PERFORMANCE USE

OPTIONAL POWER SUPPLIES. ALL SPECIFICATIONS

ARE BASED ON USING SINGLE

EXCEPT FOR SETTLING TIME TO 0.02% AND SMALL

SIGNAL S21. CONSULT THE FACTORY FOR VERSIONS

WITH OPTIONAL POWER SUPPLY PINS DISCONNECTED

INTERNAL TO THE PACKAGE.

FEATURES

Excellent Gain Accuracy: 0.99 V/V

Wide Bandwidth: 750 MHz

Slew Rate: 1200 V/ s

Low Distortion

–65 dBc @ 20 MHz

–80 dBc @ 4.3 MHz

Settling Time

5 ns to 0.1%

8 ns to 0.02%

Low Noise: 2.4 nV/

√Hz

Improved Source for CLC-110

APPLICATIONS

IF/Communications

Impedance Transformations

Drives Flash ADCs

Line Driving

GENERAL DESCRIPTION

The AD9630 is a monolithic buffer amplifier that utilizes a

patented, innovative, closed-loop design technique to achieve

exceptional gain accuracy, wide bandwidth, and low distortion.

Slew rate limiting has been overcome as indicated by the

1200 V/

µs slew rate; this improvement allows the user greater

flexibility in wideband and pulse applications. The second har-

monic distortion terms for an analog input tone of 4.3 MHz

and 20 MHz are –80 dBc and –66 dBc, respectively. Clearly,

the AD9630 establishes a new standard by combining out-

standing dc and dynamic performance in one part.

The large signal bandwidth, low distortion over frequency, and

drive capabilities of the AD9630 make the buffer an ideal flash

ADC driver. The AD9630 provides better signal fidelity than

many of the flash ADCs that it has been designed to drive.

Other applications that require increased current drive at unity

voltage gain (such as cable driving) benefit from the AD9630’s

performance.

The AD9630 is available in plastic DIP (N) and SOIC (R).

*Protected under U.S. patent numbers 5,150,074 and 5,537,079.