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AD8337 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8337
Beschreibung DC-Coupled VGA
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 28 Seiten
AD8337 Datasheet, Funktion
Data Sheet
FEATURES
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
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
APPLICATIONS
Gain trim
PET scanners
High performance AGC systems
I/Q signal processing
Video
Industrial and medical ultrasound
Radar receivers
General-Purpose, Low Cost,
DC-Coupled VGA
AD8337
GENERAL DESCRIPTION
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).
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.
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.
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
GAIN CONTROL
INTERFACE
INPP
INPN
PREAMP
PRAO
EIGHT SECTIONS
VCOM
Figure 1
18dB
VOUT
Rev. D
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2005–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






AD8337 Datasheet, Funktion
AD8337
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Data Sheet
VOUT 1
VCOM 2
INPP 3
INPN 4
AD8337
TOP VIEW
(Not to Scale)
8 VPOS
7 GAIN
6 VNEG
5 PRAO
NOTES
1. FOR BEST THERMAL PERFORMANCE,
EXPOSED PAD MUST BE SOLDERED
TO PCB.
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1 VOUT
VGA Output.
2 VCOM
Common Ground When Using Plus and Minus Supply Voltages. For single-supply operation, provide half the
positive supply voltage at the VPOS pin to VCOM pin.
3 INPP
Positive Input to Preamplifier.
4 INPN
Negative Input to Preamplifier.
5 PRAO
Preamplifier Output.
6 VNEG
Negative Supply (−VPOS for Dual Supply; GND for Single Supply).
7 GAIN
Gain Control Input Centered at VCOM.
8 VPOS
Positive Supply.
EP Exposed Pad For best thermal performance, exposed pad must be soldered to PCB.
Rev. D | Page 6 of 28

6 Page









AD8337 pdf, datenblatt
AD8337
80
VGAIN = 0.7V
60
8
6
40 4
20 2
00
–20
INPUT
–40 OUTPUT
–60
–2
–4
–6
–80
–20
–10 0
10 20 30 40 50 60
TIME (ns)
Figure 33. Small Signal Pulse Response
(See Figure 53)
–8
70
80
VGAIN = 0.7V
60
INPUT
40
8
6
4
20 2
00
–20 –2
–40
OUTPUT
–60
–4
–6
–80
–20
–10 0
–8
10 20 30 40 50 60 70
TIME (ns)
Figure 34. Small Signal Pulse Response—Inverting Feedback
(See Figure 59)
800
VGAIN = 0.7V
600
80
60
400 40
200 20
00
–200 INPUT
–400 OUTPUT
–600
–20
–40
–60
–800
–20 –10
0
10 20 30 40 50 60
TIME (ns)
Figure 35. Large Signal Pulse Response
(See Figure 53)
–80
70
Data Sheet
800 CL = 0pF
600
CL = 10pF
CL = 22pF
CL = 47pF
400
80
60
40
200 20
00
–200
INPUT
–20
–400
OUTPUT
–40
–600
–800
VS = ±2.5V
VGAIN = 0.7V
–20 –10 0
–60
–80
10 20 30 40 50 60 70
TIME (ns)
Figure 36. Large Signal Pulse Response for Three Capacitive Loads
(See Figure 53)
800 CL = 0pF
600
CL = 10pF
CL = 22pF
CL = 47pF
400
80
60
40
200 20
00
–200
INPUT
–400 OUTPUT
–20
–40
–600
–800
VS = ±5V
VGAIN = 0.7V
–20 –10 0
–60
–80
10 20 30 40 50 60 70
TIME (ns)
Figure 37. Large Signal Pulse Response for Three Capacitive Loads, VS = ±5 V
(See Figure 53)
0.8
0.6 VOUT
0.4
0.2
0
–0.2
–0.4
–0.6
VGAIN
–0.8
–0.5
0
0.5 1.0
TIME (µs)
Figure 38. Gain Response
(See Figure 54)
1.5
2.0
Rev. D | Page 12 of 28

12 Page





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