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VCA2618

更新时间： 2024-11-02 12:01:27
品牌 Logo 应用领域
德州仪器 - TI 放大器
页数 文件大小 规格书
30页 934K
描述
High Gain Adjust Range, Wideband, VARIABLE GAIN AMPLIFIER

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VCA2618 数据手册

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VCA810  
www.ti.com  
SBOS275F –JUNE 2003–REVISED DECEMBER 2010  
High Gain Adjust Range, Wideband,  
VARIABLE GAIN AMPLIFIER  
Check for Samples: VCA810  
Operating from ±5V supplies, the gain control voltage  
1
FEATURES  
for the VCA810 will adjust the gain from –40dB at 0V  
input to +40dB at –2V input. Increasing the control  
voltage above ground will attenuate the signal path to  
greater than 80dB. Signal bandwidth and slew rate  
remain constant over the entire gain adjust range.  
This 40dB/V gain control is accurate within ±1.5dB  
(±0.9dB for high grade), allowing the gain control  
voltage in an AGC application to be used as a  
Received Signal Strength Indicator (RSSI) with  
±1.5dB accuracy.  
2
•
•
•
•
•
•
•
•
•
HIGH GAIN ADJUST RANGE: ±40dB  
DIFFERENTIAL IN/SINGLE-ENDED OUT  
LOW INPUT NOISE VOLTAGE: 2.4nV/√Hz  
CONSTANT BANDWIDTH vs GAIN: 35MHz  
HIGH dB/V GAIN LINEARITY: ±0.3dB  
GAIN CONTROL BANDWIDTH: 25MHz  
LOW OUTPUT DC ERROR: < ±40mV  
HIGH OUTPUT CURRENT: ±60mA  
Excellent  
common-mode  
common-mode  
input range  
rejection  
at the  
and  
two  
LOW SUPPLY CURRENT: 24.8mA  
(max for −40°C to +85°C temperature range)  
high-impedance inputs allow the VCA810 to provide a  
differential receiver operation with gain adjust. The  
output signal is referenced to ground. Zero differential  
input voltage gives a 0V output with a small dc offset  
error. Low input noise voltage ensures good output  
SNR at the highest gain settings.  
APPLICATIONS  
•
•
•
•
•
•
•
OPTICAL RECEIVER TIME GAIN CONTROL  
SONAR SYSTEMS  
VOLTAGE-TUNABLE ACTIVE FILTERS  
LOG AMPLIFIERS  
PULSE AMPLITUDE COMPENSATION  
AGC RECEIVERS WITH RSSI  
In applications where pulse edge information is  
critical, and the VCA810 is being used to equalize  
varying channel loss, minimal change in group delay  
over gain setting will retain excellent pulse edge  
information.  
IMPROVED REPLACEMENT FOR VCA610  
+5V  
6
An improved output stage provides adequate output  
current to drive the most demanding loads. While  
principally intended to drive analog-to-digital  
converters (ADCs) or second-stage amplifiers, the  
VCA810  
1
V+  
8
V-  
±60mA  
output  
current  
will  
easily  
drive  
Gain  
doubly-terminated 50Ω lines or a passive post-filter  
Adjust  
stage over the ±1.7V output voltage range.  
+
VOUT  
X1  
5
VCA810 RELATED PRODUCTS  
2
GAIN  
ADJUST  
RANGE  
(dB)  
INPUT  
NOISE  
(nV/√Hz)  
SIGNAL  
BANDWIDTH  
(MHz)  
3
VC  
SINGLES  
DUALS  
—
0 ® -2V  
VCA811  
80  
45  
45  
45  
45  
45  
2.4  
1.25  
1
80  
80  
80  
40  
40  
30  
7
-40dB ® +40dB Gain  
—
—
—
—
VCA2612  
VCA2613  
VCA2614  
VCA2616  
VCA2618  
-5V  
3.6  
3.3  
5.5  
DESCRIPTION  
The VCA810 is a dc-coupled, wideband, continuously  
variable, voltage-controlled gain amplifier. It provides  
a differential input to single-ended output conversion  
with a high-impedance gain control input used to vary  
the gain over a –40dB to +40dB range linear in dB/V.  
1
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.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2003–2010, Texas Instruments Incorporated  
 
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