參數(shù)資料
型號(hào)： VCA810
英文描述： High Gain Adjust Range, Wideband, Voltage-Controlled Amplifier
中文描述： 高增益調(diào)整范圍，寬帶，電壓控制放大器
文件頁(yè)數(shù)： 15/25頁(yè)
文件大?。?/td> 417K
代理商： VCA810
"#$%
SBOS275C JUNE 2003 REVISED OCTOBER 2004
www.ti.com
15
5
4
3
2
1
0
1
2
3
4
5
V
IN
/V
R
Voltage Ratio
0.001
0.01
0.1
1
10
100
O
I
II
III
Figure 8. Test Result for LOG Amp for
V
R
= 100mV
LOW DRIFT, WIDEBAND EXPONENTIAL AMP
A common use of the log amp above involves signal
companding. The inverse function, signal expanding,
requires an exponential transfer function. The VCA810
produces this latter response directly, as shown in
Figure 9. DC reference V
R
again sets the amplifier input
voltage, and the input signal V
IN
now drives the gain
control point. Resistors R
1
and R
2
attenuate this drive to
prevent overloading the gain control input. Setting these
resistors at the same values as in the preceding log amp
produces an exponential amplifier with the inverse
function of the log amp.
Testing the circuit given in Figure 9 gives the exponential
response shown in Figure 10.
R
2
330
VCA810
R
1
470
V
10mV
V
C
500
500
OPA698
V
IN
V
L
V
I
3.4V
+0.5V
V
OL
=
V
R
x 10
R
1
V
IN
R
1
+R
2
2
(
+1
)
Figure 9. Exponential Amplifier
1
0.1
0.01
0.001
Input Voltage (V)
+3.0
+2.5
+2.0
+1.5
+1.0
+0.5
0
O
Figure 10. Exponential Amplifier Response
VOLTAGE-CONTROLLED LOW-PASS FILTER
In the circuit of Figure 11, the VCA810 serves as the
variable-gain element of a voltage-controlled low-pass
filter. This section discusses how this implementation
expands the circuit voltage swing capability over that
normally achieved with the equivalent multiplier
implementation. The circuit response pole responds to
control voltage V
C
according to the relationship in
Equation (3):
f
P
G
2
R
2
C
where
G
10
2(VC
1)
.
With the components shown, the circuit provides a linear
variation of the low-pass cutoff from 300Hz to 1MHz.
The response control results from amplification of the
feedback voltage applied to R
2
. First consider the case
where the VCA810 produces G = 1. Then, the circuit
performs as if this amplifier were replaced by a short
circuit. Visually doing so leaves a simple voltage amplifier
with a feedback resistor bypassed by a capacitor. This
basic circuit produces a response pole at
f
P
G
2
R
2
C
.
(3)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
VCA810_12 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Gain Adjust Range, Wideband, VARIABLE GAIN AMPLIFIER
VCA-8103 制造商:Quest Technology International Inc 功能描述:
VCA810AID 功能描述:特殊用途放大器 High-Gain Adj Range Wideband Vltg-Cntrl RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
VCA810AIDG4 功能描述:特殊用途放大器 High-Gain Adj Range Wideband Vltg-Cntrl RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
VCA810AIDR 功能描述:特殊用途放大器 High-Gain Adj Range Wideband Vltg-Cntrl RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
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