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AD8331TRQZ-EP PDF预览

AD8331TRQZ-EP

更新时间: 2024-11-07 19:34:59
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页数 文件大小 规格书
9页 209K
描述
Single VGA with Ultralow Noise Preamplifier and Programmable RIN

AD8331TRQZ-EP 数据手册

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Ultralow Noise VGA with  
Preamplifier and Programmable RIN  
Enhanced Product  
AD8331-EP  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
LON LOP VIP VIN  
VCM  
HILO  
Ultralow noise preamplifier (preamp)  
Input voltage noise: 0.74 nV/√Hz typical  
Input current noise: 2.5 pA/√Hz typical  
−3 dB small signal bandwidth: 120 MHz typical  
Low power dissipation: 125 mW typical  
Wide gain range with programmable postamp  
−4.5 dB to +43.5 dB in low gain mode  
7.5 dB to 55.5 dB in high gain mode  
Low output-referred noise: 48 nV/√Hz typical  
Active input impedance matching  
3.5dB OR 15.5dB  
V
MID  
LNA  
19dB  
ATTENUATOR  
VOH  
VOL  
48dB  
21dB  
PA  
INH  
+
CLAMP  
LMD  
GAIN  
VCM  
BIAS  
VGA BIAS AND  
INTERPOLATOR  
RCLMP  
CONTROL  
INTERFACE  
AD8331-EP  
ENBx GAIN  
Optimized for 10-bit/12-bit ADCs  
Figure 1.  
Selectable output clamping level  
Single 5 V supply operation  
ENHANCED PRODUCT FEATURES  
Supports defense and aerospace applications  
(AQEC standard)  
Extended industrial temperature range: −55°C to +105°C  
Controlled manufacturing baseline  
1 assembly/test site  
1 fabrication site  
Product change notification  
Qualification data available on request  
The 48 dB gain range of the VGA makes this device suitable for  
a variety of applications. Excellent bandwidth uniformity is  
maintained across the entire range. The gain control interface  
provides precise linear in dB scaling of 50 dB/V for control  
voltages between 100 mV and 0.95 V. Factory trim ensures  
excellent part to part gain matching.  
APPLICATIONS  
Radars  
Ultrasound and sonar time-gain controls  
High performance automatic gain control (AGC) systems  
In-phase quadrature (I/Q) signal processing  
High speed ADC drivers  
Differential signal paths result in superb second- and third-  
order distortion performance and low crosstalk.  
The low output referred noise of the VGA is advantageous in  
driving high speed differential analog-to-digital converters  
(ADCs). The gain of the post amplifier (PA) can be pin selected  
to 3.5 dB or 15.5 dB to optimize gain range and output noise for  
12-bit or 10-bit converter applications. The output can be limited to  
a user selected clamping level, preventing input overload to a  
subsequent ADC. An external resistor adjusts the clamping level.  
GENERAL DESCRIPTION  
The AD8331-EP is a single-channel, ultralow noise, linear in dB,  
variable gain amplifier (VGA). Optimized for ultrasound  
systems, the device is usable as a low noise variable gain element  
at frequencies up to 120 MHz.  
Included in the channel are an ultralow noise preamp (LNA), an  
X-AMP® VGA with 48 dB of gain range, and a selectable gain  
postamp with adjustable output limiting. The LNA gain is 19 dB  
with a single-ended input and differential outputs. Using a single  
resistor, the LNA input impedance can be adjusted to match a  
signal source without compromising noise performance.  
The operating temperature is specified across the −55°C to  
+105°C extended industrial range.  
Additional application and technical information can be found  
in the AD8331 data sheet.  
Rev. 0  
Document Feedback  
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  
rightsof third parties that may result fromits 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 andregisteredtrademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Technical Support  
©2019 Analog Devices, Inc. All rights reserved.  
www.analog.com  
 
 
 
 
 

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