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VCA2612

更新时间： 2024-11-02 03:20:31
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德州仪器 - TI 放大器
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35页 900K
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Wideband, > 40dB Gain Adjust Range, Linear in V/V VARIABLE GAIN AMPLIFIER

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VCA822  
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SBOS343A–SEPTEMBER 2007–REVISED OCTOBER 2007  
Wideband, > 40dB Gain Adjust Range, Linear in V/V  
VARIABLE GAIN AMPLIFIER  
1
FEATURES  
DESCRIPTION  
23  
•
150MHz SMALL-SIGNAL BANDWIDTH  
(G = +10V/V)  
The VCA822 is a dc-coupled, wideband, linear in V/V,  
continuously variable, voltage-controlled gain  
amplifier. It provides differential input to  
single-ended conversion with a high-impedance gain  
control input used to vary the gain down 40dB from  
the nominal maximum gain set by the gain resistor  
(RG) and feedback resistor (RF).  
•
•
•
•
•
•
137MHz, 5VPP BANDWIDTH (G = +10V/V)  
0.1dB GAIN FLATNESS to 28MHz  
1700V/µs SLEW RATE  
a
> 40dB GAIN ADJUST RANGE  
HIGH GAIN ACCURACY: 20dB ±0.3dB  
HIGH OUTPUT CURRENT: ±160mA  
The VCA822 internal architecture consists of two  
input buffers and an output current feedback amplifier  
stage integrated with a multiplier core to provide a  
complete variable gain amplifier (VGA) system that  
does not require external buffering. The maximum  
gain is set externally with two resistors, providing  
flexibility in designs. The maximum gain is intended  
to be set between +2V/V and +100V/V. Operating  
from ±5V supplies, the gain control voltage for the  
VCA822 adjusts the gain linearly in V/V as the control  
voltage varies from +1V to –1V. For example, set for  
a maximum gain of +10V/V, the VCA822 provides  
10V/V, at +1V input, to 0.1V/V at –1V input of gain  
control range. The VCA822 offers excellent gain  
APPLICATIONS  
•
•
•
•
•
•
DIFFERENTIAL LINE RECEIVERS  
DIFFERENTIAL EQUALIZERS  
PULSE AMPLITUDE COMPENSATION  
VARIABLE ATTENUATORS  
VOLTAGE-TUNABLE ACTIVE FILTERS  
DROP-IN UPGRADE TO LMH6503  
RF  
VIN1  
+VIN  
RG+  
RS  
linearity. For  
a
20dB maximum gain, and  
a
RL  
FB  
VCA822  
R1  
C1  
RG  
VOUT  
gain-control input voltage varying between 0V and  
1V, the gain does not deviate by more than ±0.3dB  
(maximum at +25°C).  
CL  
RG-  
VIN2  
-VIN  
20W  
RS  
Table 1. VCA822 RELATED PRODUCTS  
GAIN  
ADJUST  
RANGE  
(dB)  
INPUT  
NOISE  
(nV/√Hz)  
SIGNAL  
BANDWIDTH  
(MHz)  
Figure 1. Differential Equalizer  
SINGLES  
VCA810  
—
DUALS  
—
80  
45  
45  
52  
48  
40  
40  
40  
40  
2.4  
1.25  
1
35  
80  
9
6
VCA2612  
VCA2613  
VCA2615  
VCA2617  
—
Equalized Frequency  
Response  
—
80  
3
—
0.8  
4.1  
8.2  
7.0  
8.2  
7.0  
50  
0
-3  
—
50  
-6  
VCA820  
VCA821  
VCA822  
VCA824  
150  
420  
150  
420  
Initial Frequency Response  
of VCA822 with RC Load  
-9  
—
-12  
-15  
-18  
-21  
-24  
—
—
RL = 75W  
CF = 100pF  
1M  
10M  
100M  
Frequency (Hz)  
1G  
Figure 2. Differential Equalization of an RC Load  
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.  
2
3
X2Y is a trademark of X2Y Corporation.  
All other 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 the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2007, Texas Instruments Incorporated  
 
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