參數(shù)資料
型號(hào)： VCA810AID
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)： 16/25頁(yè)
文件大?。?/td> 417K
代理商： VCA810AID
"#$%
SBOS275C JUNE 2003 REVISED OCTOBER 2004
www.ti.com
16
For G > 1, the circuit applies a greater voltage to R
2
,
increasing the feedback current this resistor supplies to
the summing junction of the OPA820. The increased
feedback current produces the same result as if R
2
had
been decreased in value in the basic circuit described
above. Decreasing the effective R
2
resistance moves the
circuit pole to a higher frequency, producing the
G
2
f
P
R
2
C
response control.
Finite loop gain and a signal-swing limitation set
performance boundaries for the circuit. Both limitations
occur when the VCA810 attenuates, rather than amplifies,
the feedback signal. These two limitations reduce the
circuit’s utility at the lower extreme of the VCA810 gain
range. For 1
≤
V
C
≤
0, this amplifier produces attenuating
gains in the range from 0dB to 40dB. This range directly
reduces the net gain in the circuit’s feedback loop,
increasing gain error effects. Additionally, this attenuation
transfers an output swing limitation from the OPA820
output to the overall circuit’s output. Note that OPA820
output voltage, V
OA
, relates to V
O
through the expression,
V
O
G
V
OA
. Thus, a G < 1 limits the maximum V
O
swing to a value less than the maximum V
OA
swing.
OPA820
VCA810
V
C
V
O
V
OA
R
2
330
R
1
330
C
0.047
μ
F
V
I
f
P
G
2 R
2
C
G
10
2(VC
1)
V
O
V
I
R
2
R
1
1
s
R
2
C
2
G
1
Figure 11. Tunable Low-Pass Filter
Figure 12 shows the low-pass frequency for different
control voltages.
3
0
3
6
9
12
15
Frequency (Hz)
10k
100k
1M
10M
G
V
C
=
1.4V
V
C
=
2V
V
C
=
1.6V
V
C
=
1.8V
Figure 12. Voltage-Controlled Low-Pass Filter
Frequency Response
TUNABLE EQUALIZER
A circuit analogous to the above low-pass filter produces
a voltage-controlled equalizer response. The gain control
provided by the VCA810 of Figure 13 varies this circuit
response zero from 1Hz to 10kHz, according to the
relationship of Equation (4):
f
Z
G
GR
1
C
2
where
G
10
2(VC
1)
.
To visualize the circuit’s operation, consider a circuit
condition and an approximation that permit replacing the
VCA810 and R
3
with short circuits. First, consider the case
where the VCA810 produces G = 1. Replacing this
amplifier with a short circuit leaves the operation
unchanged. In this shorted state, the circuit is simply a
voltage amplifier with an R-C bypass around R
1
. The
resistance of this bypass, R
3
, serves only to phase-
compensate the circuit, and practical factors make R
3
<< R
1
.
Neglecting R
3
for the moment, the circuit becomes just a
voltage amplifier with a capacitive bypass of R
1
. This
circuit produces a response zero at
f
Z
1
2
R
1
C
.
(4)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
VCA810AIDRG4 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
VCA810ID 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
VCA810IDG4 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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