a
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
NC #
鈥揑NPUT
+INPUT
鈥揤
S
1
2
3
4
Wideband Voltage
Feedback Amplifier
AD9621*
CONNECTION DIAGRAM
8
7
6
5
NC #
+V
S
OUTPUT
NC
AD9621
# OPTIONAL CAPACITOR CB CONNECTED HERE
DECREASES SETTLING TIME
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
AD9622
AD9623
AD9624
Units
Parameter
AD9621
Minimum Stable Gain
Harmonic Distortion (20 MHz)
Large Signal Bandwidth (4 V p-p)
SSBW (0.5 V p-p)
Slew Rate
Rise/Fall Time (0.5 V Step)
Settling Time (to 0.1%/0.01%)
Input Noise (0.1 MHz 鈥?200 MHz)
+1
鈥?2
130
350
1200
2.4
7/11
80
+2
鈥?6
160
220
1500
1.7
8/14
49
+4
鈥?4
190
270
2100
1.6
8/14
36
+6
鈥?6
200
300
2200
1.5
8/14
32
V/V
dB
MHz
MHz
V/碌s
ns
ns
碌V
rms
REV. 0
Information furnished by Analog Devices is believed to be accurate and
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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