REV. 0

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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

AD9621*

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

Tel: 617/329-4700

Fax: 617/326-8703

CONNECTION DIAGRAM

1

2

3

4

8

7

6

5

AD9621

NC #

–INPUT

+INPUT

–V

S

NC #

+V

S

OUTPUT

NC

# OPTIONAL CAPACITOR CB CONNECTED HERE

DECREASES SETTLING TIME

FEATURES

350 MHz Small Signal Bandwidth

130 MHz Large Signal BW (4 V p-p)

High Slew Rate: 1200 V/ s

Fast Settling: 11 ns to 0.01%/7 ns to 0.1%

3 V Supply Operation

APPLICATIONS

ADC Input Driver

Differential Amplifiers

IF/RF Amplifiers

Pulse Amplifiers

Professional Video

DAC Current-to-Voltage

Baseband and Video Communications

Pin Diode Receivers

Active Filters/lntegrators/Log Amps

GENERAL DESCRIPTION

The AD9621 is one of a family of very high speed and wide

bandwidth amplifiers utilizing a voltage feedback architecture.

These amplifiers define a new level of performance for voltage

feedback amplifiers, especially in the categories of large signal

bandwidth, slew rate, settling, and low noise.

Proprietary design architectures have resulted in an amplifier

family that combines the most attractive attributes of both cur-

rent feedback and voltage feedback amplifiers. The AD9621 ex-

hibits extraordinarily accurate and fast pulse response

characteristics (7 ns settling to 0.1%) as well as extremely wide

small and large signal bandwidth previously found only in cur-

rent feedback amplifiers. When combined with balanced high

impedance inputs and low input noise current more common to

voltage feedback architectures, the AD9621 offers performance

not previously available in a monolithic operational amplifier.

*Protected by U.S. Patent 5,150,074 and others pending.

Other members of the AD962X amplifier family are the

AD9622 (G = +2), AD9623 (G = +4), and the AD9624

(G = +6). A separate data sheet is available from Analog De-

vices for each model. Each generic device has been designed for

a different minimum stable gain setting, allowing users flexibility

in optimizing system performance. Dynamic performance speci-

fications such as slew rate, settling time, and distortion vary

from model to model. The table below summarizes key perfor-

mance attributes for the AD962X family and can be used as a

selection guide.

The AD9621 is offered in industrial and military temperature

ranges. Industrial versions are available in plastic DIP, SOIC,

and cerdip; MIL versions are packaged in cerdips.

PRODUCT HIGHLIGHTS

1. Wide Large Signal Bandwidth

2. High Slew Rate

3. Fast Settling

4. Output Short-Circuit Protected

Parameter

AD9621

AD9622

AD9623

AD9624

Units

Minimum Stable Gain

+1

+2

+4

+6

V/V

Harmonic Distortion (20 MHz)

–52

–66

–64

–66

dB

Large Signal Bandwidth (4 V p-p)

130

160

190

200

MHz

SSBW (0.5 V p-p)

350

220

270

300

MHz

Slew Rate

1200

1500

2100

2200

V/

µs

Rise/Fall Time (0.5 V Step)

2.4

1.7

1.6

1.5

ns

Settling Time (to 0.1%/0.01%)

7/11

8/14

8/14

8/14

ns

Input Noise (0.1 MHz – 200 MHz)

80

49

36

32

µV rms

Wideband Voltage

Feedback Amplifier