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VCA2613 PDF预览

VCA2613

更新时间: 2024-11-01 22:16:15
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16页 341K
描述
Dual, VARIABLE GAIN AMPLIFIER with Low-Noise Preamp

VCA2613 数据手册

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VCA2613  
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SBOS179D – DECEMBER 2000 – REVISED OCTOBER 2004  
Dual, VARIABLE GAIN AMPLIFIER  
with Low-Noise Preamp  
FEATURES  
DESCRIPTION  
The VCA2613 is a dual, Low-Noise Preamplifier (LNP), plus  
low-noise Variable Gain Amplifier (VGA). The combination of  
Active Termination (AT) and Maximum Gain Select (MGS)  
allow for the best noise performance. The VCA2613 also  
features low crosstalk and outstanding distortion perfor-  
mance.  
LOW NOISE PREAMP:  
Low Input Noise: 1.0nV/Hz  
Active Termination Noise Reduction  
Switchable Termination Value  
80MHz Bandwidth  
5dB to 25dB Gain  
The LNP has differential input and output capability and is  
strappable for gains of 5dB, 17dB, 22dB or 25dB. Low input  
impedance is achieved by AT, resulting in as much as a 4.6dB  
improvement in noise figure over conventional shunt termina-  
tion. The termination value can also be switched to accommo-  
date different sources. The output of the LNP is available for  
external signal processing.  
Differential In and Out  
LOW NOISE VARIABLE GAIN AMPLIFIER:  
Low Noise VCA: 3.3nV/Hz, Differential  
Programming Optimizes Noise Figure  
24dB to 45dB Gain  
40MHz Bandwidth  
Differential In and Out  
The variable gain is controlled by an analog voltage whose  
gain varies from 0dB to the gain set by the MGS. The ability  
to program the variable gain also allows the user to optimize  
dynamic range. The VCA input can be switched from the  
LNP to external circuits for different applications. The output  
can be used in either a single-ended or differential mode to  
drive high-performance Analog-to-Digital (A/D) converters,  
and is cleanly limited for optimum overdrive recovery.  
LOW CROSSTALK: 52dB at Max Gain, 5MHz  
HIGH-SPEED VARIABLE GAIN ADJUST  
SWITCHABLE EXTERNAL PROCESSING  
APPLICATIONS  
The combination of low noise, gain, and gain range program-  
mability makes the VCA2613 a versatile building block in a  
number of applications where noise performance is critical.  
The VCA2613 is available in a TQFP-48 package.  
ULTRASOUND SYSTEMS  
WIRELESS RECEIVERS  
TEST EQUIPMENT  
Maximum Gain Select  
VCACNTL  
FBCNTL  
LNPOUTN  
VCAINN  
MGS0 MGS1 MGS2  
RF2  
RF1  
FBSW  
FB  
VCA2613  
(1 of 2 Channels)  
Analog  
Control  
Maximum Gain  
Select  
Input  
LNPIN  
P
VCAOUTN  
LNPGS1  
LNPGS2  
Programmable  
Gain Amplifier  
24 to 45dB  
Voltage  
Controlled  
Attenuator  
Low Noise  
Preamp  
5dB to 25dB  
LNP  
Gain Set  
LNPGS3  
VCAOUT  
P
LNPIN  
N
LNPOUT  
P
VCAIN  
P
SEL  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
Copyright © 2000-2004, Texas Instruments Incorporated  
www.ti.com  

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