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VCA810AID

更新时间： 2024-11-02 22:16:15
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BB 放大器
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25页 414K
描述
High Gain Adjust Range, Wideband, Voltage-Controlled Amplifier

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VCA810AID 数据手册

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VCA810  
SBOS275C − JUNE 2003 − REVISED OCTOBER 2004  
High Gain Adjust Range, Wideband,  
Voltage-Controlled Amplifier  
FEATURES  
DESCRIPTION  
The VCA810 is a DC-coupled, wideband, continuously  
D
D
D
D
D
D
D
D
D
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  
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.  
Operating from 5V supplies, the gain control voltage 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 > 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.  
LOW SUPPLY CURRENT: 24.8mA (max for  
−40ꢂ C to +85ꢂ C temperature range)  
Excellent common-mode rejection and common-mode input  
range at the two 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  
D
D
D
D
D
D
D
OPTICAL RECEIVER TIME GAIN CONTROL  
SONAR SYSTEMS  
VOLTAGE-TUNABLE ACTIVE FILTERS  
LOG AMPLIFIER  
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.  
PULSE AMPLITUDE COMPENSATION  
AGC RECEIVER WITH RSSI  
IMPROVED REPLACEMENT FOR THE  
VCA610  
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 2nd-stage  
amplifiers, the 60mA output current will easily drive  
doubly-terminated 50Ω lines or a passive post filter stage  
over the 1.7V output voltage range.  
+5V  
6
VCA810  
1
8
V+  
VCA810 RELATED PRODUCTS  
−
V
Gain  
INPUT  
NOISE  
(nV/ꢁHz)  
SIGNAL  
BANDWIDTH  
(MHz)  
Adjust  
GAIN ADJUST  
RANGE (dB)  
+
V
X1  
OUT  
SINGLES  
DUALS  
—
5
VCA811  
80  
45  
45  
45  
45  
45  
2.4  
1.25  
1
80  
80  
80  
40  
40  
30  
2
3
—
—
—
—
—
VCA2612  
VCA2613  
VCA2614  
VCA2616  
VCA2618  
V
C
3.6  
3.3  
5.5  
→ −  
0
2V  
→
+40dB Gain  
7
−
40dB  
−
5V  
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.  
ꢀꢁ ꢂ ꢃꢄ ꢅ ꢆꢇ ꢂꢈ ꢃ ꢉꢆꢉ ꢊꢋ ꢌꢍ ꢎ ꢏꢐ ꢑꢊꢍꢋ ꢊꢒ ꢓꢔ ꢎ ꢎ ꢕꢋꢑ ꢐꢒ ꢍꢌ ꢖꢔꢗ ꢘꢊꢓ ꢐꢑꢊ ꢍꢋ ꢙꢐ ꢑꢕꢚ ꢀꢎ ꢍꢙꢔ ꢓꢑꢒ  
ꢓ ꢍꢋ ꢌꢍꢎ ꢏ ꢑꢍ ꢒ ꢖꢕ ꢓ ꢊ ꢌꢊ ꢓ ꢐ ꢑꢊ ꢍꢋꢒ ꢖ ꢕꢎ ꢑꢛꢕ ꢑꢕ ꢎ ꢏꢒ ꢍꢌ ꢆꢕꢜ ꢐꢒ ꢇꢋꢒ ꢑꢎ ꢔꢏ ꢕꢋꢑ ꢒ ꢒꢑ ꢐꢋꢙ ꢐꢎ ꢙ ꢝ ꢐꢎ ꢎ ꢐ ꢋꢑꢞꢚ  
ꢀꢎ ꢍ ꢙꢔꢓ ꢑ ꢊꢍ ꢋ ꢖꢎ ꢍ ꢓ ꢕ ꢒ ꢒ ꢊꢋ ꢟ ꢙꢍ ꢕ ꢒ ꢋꢍꢑ ꢋꢕ ꢓꢕ ꢒꢒ ꢐꢎ ꢊꢘ ꢞ ꢊꢋꢓ ꢘꢔꢙ ꢕ ꢑꢕ ꢒꢑꢊ ꢋꢟ ꢍꢌ ꢐꢘ ꢘ ꢖꢐ ꢎ ꢐꢏ ꢕꢑꢕ ꢎ ꢒꢚ  
Copyright 2003−2004, Texas Instruments Incorporated  
www.ti.com  
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