FEATURES
PIN CONFIGURATION
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
NC 1
NC
8
–INPUT
2
7
+VS
+INPUT
3
6
OUTPUT
–VS 4
TOP VIEW
5 NC
(Not to Scale)
NOTES
1. NC = NO CONNECT.
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 architecture allow maximum flexibility when designing active filters.
APPLICATIONS
The AD9631/AD9632 are offered in the industrial (−40°C to
+85°C) temperature range. They are available in PDIP and SOIC.
–30
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 feedback amplifiers. Its classical op amp structure works much more
predictably in many designs.
HARMONIC DISTORTION (dBc)
–40
VS = ±5V
RL = 500Ω
VOUT = 2V p-p
–50
–60
–70
–80
–90
SECOND HARMONIC
–100
–110
THIRD HARMONIC
–120
–130
10k
100k
1M
10M
100M
FREQUENCY (Hz)
00601-002
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
Rev. D
AD9631/
AD9632
00601-001
Data Sheet
Ultralow Distortion, Wide Bandwidth
Voltage Feedback Op Amps
AD9631/AD9632
Figure 2. AD9631 Harmonic Distortion vs. Frequency, G = +1
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