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AD8337_07

更新时间: 2024-11-25 04:31:03
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
24页 800K
描述
General-Purpose, Low Cost, DC-Coupled VGA

AD8337_07 数据手册

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General-Purpose, Low Cost,  
DC-Coupled VGA  
AD8337  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
VPOS  
Low noise  
8
Voltage noise = 2.2 nV/√Hz  
AD8337  
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  
GAIN CONTROL  
INTERFACE  
GAIN  
7
18dB  
1 VOUT  
PREAMP  
(PRA)  
DC-coupled  
8 SECTIONS  
3
4
2
+
INPP  
INPN  
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  
VCOM  
5
6
PRAO  
VNEG  
Figure 1.  
APPLICATIONS  
Gain trim  
PET scanners  
High performance AGC systems  
I/Q signal processing  
Video  
Industrial and medical ultrasound  
Radar receivers  
GENERAL DESCRIPTION  
The AD8337 includes an uncommitted operational current-  
feedback preamplifier (PrA) that operates in inverting or  
noninverting configurations. Using external resistors, the  
device can be configured for gains of 6 dB or greater. The  
AD8337 is characterized by a noninverting PrA gain of 2× using  
two external 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 preamp gain. Multiple  
AD8337s can be connected in series for larger gain ranges, and  
for interstage filtering to suppress noise and distortion, and for  
nulling offset voltages.  
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 makes 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 generated by  
photodiodes or photomultiplier tubes.  
The operating temperature range is –40°C to +85°C, and it is  
available in an 8-lead, 3 mm × 3 mm LFCSP.  
The AD8337 uses the popular and versatile X-AMP® architecture,  
exclusively from Analog Devices, Inc., with a gain range of 24 dB.  
The gain control interface provides precise linear-in-dB scaling  
of 19.7 dB/V, referenced to VCOM.  
Rev. B  
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 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.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
www.analog.com  
Fax: 781.461.3113 ©2005-2007 Analog Devices, Inc. All rights reserved.  
 

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