
Ultralow Distortion, Wide Bandwidth
Voltage Feedback Op Amps
Data Sheet
Rev. D
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FEATURES
Wide bandwidth
Small signal
Large signal (4 V p-p)
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
amplifiers. The AD9631 is unity gain stable. The AD9632 is
stable at gains of 2 or great
er. Using a voltage feedback
architecture, the exceptional settling time, bandwidth, and low
distortion of the AD9631/AD9632 meet the requirements of
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
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.
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.
+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.
00601-
001
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
10k
100k
1M
10M
100M
HAR
M
O
NI
C
D
IS
T
O
RT
IO
N
(
d
Bc
)
FREQUENCY (Hz)
THIRD HARMONIC
SECOND HARMONIC
VS = ±5V
RL = 500
VOUT = 2V p-p
0060
1-
002