Ultralow Distortion, Wide Bandwidth

Voltage Feedback Op Amps

Data Sheet

AD9631/AD9632

Rev. D

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FEATURES

Wide bandwidth

AD9631, G = +1

AD9632, G = +2

Small signal

AD9631, 320 MHz

AD9632, 250 MHz

Large signal (4 V p-p)

AD9631, 175 MHz

AD9632, 180 MHz

Ultralow distortion (SFDR), low noise

−113 dBc typical @ 1 MHz

−95 dBc typical @ 5 MHz

−72 dBc typical @ 20 MHz

46 dBm third-order intercept @ 25 MHz

7.0 nV/√Hz spectral noise density

High speed

Slew rate: 1300 V/μs

Settling time to 0.01%, 2 V step: 16 ns

±3 V to ±5 V supply operation

17 mA supply current

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/integrators/log amps

GENERAL DESCRIPTION

The AD9631/AD9632 are very high speed and wide bandwidth

amplifiers. The AD9631 is unity gain stable. The AD9632 is

stable at gains of 2 or greater. Using a voltage feedback

architecture, the exceptional settling time, bandwidth, and low

distortion of the AD9631/AD9632 meet the requirements of

many applications that previously depended on current feed-

back amplifiers. Its classical op amp structure works much more

predictably in many designs.

PIN CONFIGURATION

Figure 1. 8-Lead PDIP (N) and SOIC (R) Packages

A proprietary design architecture has produced an amplifier

that combines many of the best characteristics of both current

feedback and voltage feedback amplifiers. The AD9631/AD9632

exhibit exceptionally fast and accurate pulse response (16 ns to

0.01%) as well as extremely wide small signal and large signal

bandwidth and ultralow distortion. The AD9631 achieves

−72 dBc at 20 MHz, 320 MHz small signal bandwidth, and

175 MHz large signal bandwidths.

These characteristics position the AD9631/AD9632 ideally for

driving flash as well as high resolution ADCs. Additionally, the

balanced high impedance inputs of the voltage feedback archi-

tecture allow maximum flexibility when designing active filters.

The AD9631/AD9632 are offered in the industrial (−40°C to

+85°C) temperature range. They are available in PDIP and SOIC.

Figure 2. AD9631 Harmonic Distortion vs. Frequency, G = +1

1

2

3

4

NC

–INPUT

+INPUT

–VS

8

7

6

5

NC

AD9631/

AD9632

TOP VIEW

(Not to Scale)

+VS

OUTPUT

NC

NOTES

1. NC = NO CONNECT.

–30

–40

–50

–60

–70

–80

–90

–100

–110

–120

–130

10k

100k

1M

10M

100M

FREQUENCY (Hz)

THIRD HARMONIC

SECOND HARMONIC

VS = ±5V

RL = 500Ω

VOUT = 2V p-p