參數(shù)資料
型號： VCA822IDGS
廠商： Texas Instruments, Inc.
英文描述： Wideband, > 40dB Gain Adjust Range, Linear in V/V VARIABLE GAIN AMPLIFIER
中文描述： 寬帶，“40dB的增益調(diào)整范圍在V，線性音頻/視頻可變增益放大器
文件頁數(shù)： 21/35頁
文件大?。?/td> 837K
代理商： VCA822IDGS
www.ti.com
DIFFERENTIAL EQUALIZER
If the application requires frequency shaping (the
transition from one gain to another), the VCA822 can
be used advantageously because its architecture
allows the application to isolate the input from the
gain
setting
elements.
implementation of such a configuration. The transfer
function is shown in
Equation 3
.
G = 2
′
′
R
F
R
G
1 + sR C
1
1 + sR C
1
(3)
9
6
-
24
Frequency (Hz)
G
1M
1G
3
-
21
-
3
0
100M
10M
-
18
-
15
-
12
-
9
-
6
Initial Frequency Response
of VCA822 with RC Load
Equalized Frequency
Response
DIFFERENTIAL CABLE EQUALIZER
A
differential
cable
implemented using the VCA822. An example of a
cable equalization for 100 feet of Belden Cable
1694F is illustrated in
Figure 85
, with the result for
this
implementation
shown
implementation has a maximum error of 0.2dB from
dc to 40MHz.
R
F
+V
IN
R
G+
R
G
-
-
V
IN
FB
R
S
20
W
V
IN1
VCA822
R
G
R
1
C
1
R
S
V
IN2
2.0
-
1.0
Frequency (MHz)
1
E
1
100
1.5
1.0
10
-
0.5
0
0.5
Cable Attenuations
VCA822 with
Equalization
VCA822
SBOS343A–SEPTEMBER 2007–REVISED OCTOBER 2007
Figure
82
shows
an
Figure 83. Differential Equalization of an RC Load
equalizer
can
easily
be
in
Figure
84
.
This
Figure 82. Differential Equalizer
This transfer function has one pole, P
1
(located at
R
G
C
1
), and one zero, Z
1
(located at R
1
C
1
). When
equalizing an RC load, R
L
and C
L
, compensate the
pole added by the load located at R
L
C
L
with the zero
Z
1
. Knowing R
L
, C
L
, and R
G
allows the user to select
C
1
as a first step and then calculate R
1
. Using
R
L
= 75
, C
L
= 100pF and wanting the VCA822 to
operate at a gain of +2V/V, which gives R
F
= R
G
=
1.33k
, allows the user to select C
1
= 5pF to ensure
a positive value for the resistor R
1
. With all these
values known, R
1
can be calculated to be 170
. The
frequency response for both the initial, unequalized
frequency response and the resulting equalized
frequency response are shown in
Figure 83
.
Figure 84. Cable Attenuation versus Equalizer
Gain
Note that this implementation shows the cable
attenuation side-by-side with the equalization in the
same plot. For a given frequency, the equalization
function realized with the VCA822 matches the cable
attenuation. The circuit in
Figure 85
is a driver circuit.
To implement a receiver circuit, the signal is received
differentially between the +V
IN
and –V
IN
inputs.
Copyright 2007, Texas Instruments Incorporated
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VCA822
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VCA822IDGSRG4 功能描述:運算放大器 - 運放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
VCA822IDGST 功能描述:運算放大器 - 運放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
VCA822IDGSTG4 功能描述:運算放大器 - 運放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
VCA822IDR 功能描述:運算放大器 - 運放 WB >40dB Gain Adj Rng Lin V/V Var Gain RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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