General-Purpose, Low Cost,
DC-Coupled VGA
Data Sheet
AD8337
FEATURES
GENERAL DESCRIPTION
Low noise
Voltage noise = 2.2 nV/√Hz
Current noise = 4.8 pA/√Hz (positive input)
Wide bandwidth (−3 dB) = 280 MHz
Nominal gain range: 0 dB to 24 dB (preamp gain = 6 dB)
Gain scaling: 19.7 dB/V
The AD8337 is a low noise, single-ended, linear-in-dB, general-
purpose, variable gain amplifier (VGA) usable at frequencies
from dc to 100 MHz; the −3 dB bandwidth is 280 MHz.
Excellent bandwidth uniformity across the entire gain range
and low output referred noise make the AD8337 ideal for
gain trim applications and for driving high speed analog-to-
digital converters (ADCs).
DC-coupled
Single-ended input and output
High speed uncommitted op amp input
Supplies: +5 V, 2.5 V, or 5 V
Low power: 78 mW with 2.5 V supplies
Excellent dc characteristics combined with high speed make the
AD8337 particularly suited for industrial ultrasound, PET
scanners, and video applications. Dual-supply operation enables
gain control of negative going pulses, such as those generated
by photodiodes or photomultiplier tubes.
APPLICATIONS
Gain trim
PET scanners
The AD8337 uses the Analog Devices, Inc., exclusive X-AMP®
architecture with 24 dB gain range scaled to 19.7 dB/V,
referenced to VCOM.
High performance AGC systems
I/Q signal processing
Video
Industrial and medical ultrasound
Radar receivers
The AD8337 preamplifier is configured in a current feedback
architecture optimized for gains of 6 dB to 24 dB. The AD8337
is characterized by a noninverting preamplifier gain of 2× using a
pair of 100 Ω resistors. The attenuator has a range of 24 dB, and
the output amplifier has a fixed gain of 8× (18.06 dB). The lowest
nominal gain range is 0 dB to 24 dB and can be shifted up or down
by adjusting the preamplifier gain. Series connected AD8337
devices provide larger gain ranges, interstage filtering to suppress
noise and distortion, and nulling of offset voltages.
FUNCTIONAL BLOCK DIAGRAM
GAIN CONTROL
INTERFACE
GAIN
EIGHT SECTIONS
PREAMP
INPP
INPN
18dB
VOUT
PRAO
VCOM
Figure 1
Rev. D
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