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| 型号： | VCA821IDGSR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 14/36页 |
| 文件大小： | 1276K |
| 代理商： | VCA821IDGSR |
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DIFFERENTIAL CABLE EQUALIZER
AGC LOOP
2.0
1.5
1.0
0.5
0
-0.5
-1.0
Frequency(MHz)
1694FCableAttenuation(dB)
EqualizerGain(dB)
1
10
100
CableAttenuation
VCA821Equalization
R
2
453W
+V
IN
R
G+
R
G-
-VIN
R
9
432W
C
9
10 F
m
R
8
50W
R
5
50W
R
1
20W
R
10
75W
VCA821
R
21
3kW
C
5
4pF
R
17
6kW
C
6
320 F
m
R
18
13.6kW
C
7
300 F
m
V
G
DC
=+1V
75
Load
W
V
G
GND
V
REF
FB
V
OUT
V
IN
V
OUT
www.ti.com ....................................................................................................................................... SBOS407B – DECEMBER 2007 – REVISED DECEMBER 2008
A
differential
cable
equalizer
can
easily
be
In the typical AGC loop shown in Figure 81, the
implemented using the VCA821. An example of a
OPA695 follows the VCA821 to provide 40dB of
cable equalization for 100 feet of Belden cable 1694F
overall gain. The output of the OPA695 is rectified
is illustrated in Figure 78, with Figure 79 showing the
and integrated by an OPA820 to control the gain of
result for this implementation. This implementation
the VCA821. when the output level exceeds the
has a maximum error of 0.2dB from dc to 70MHz.
reference voltage (VREF), the integrator ramps down
reducing the gain of the AGC loop. Conversely, if the
Note that this implementation shows the cable
output is too small, the integrator ramps up increasing
attenuation side-by-side with the equalization in the
the net gain and the output voltage.
same plot. For a given frequency, the equalization
function realized with the VCA821 matches the cable
attenuation. The circuit in Figure 80 is a driver circuit.
To implement a receiver circuit, the signal is received
differentially between the +VIN and –VIN inputs.
Figure 79. Cable Attenuation versus Equalizer Gain
Figure 80. Differential Cable Equalizer
Copyright 2007–2008, Texas Instruments Incorporated
21
Product Folder Link(s): VCA821
相关PDF资料 |
PDF描述 |
|---|---|
| VCA821IDRG4 | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| VCO-103 | VCO, 50 MHz - 100 MHz |
| VCO-108 | VCO, 800 MHz - 1600 MHz |
| VCO-117TC | VCO, 300 MHz - 600 MHz |
| VCO-219TC | VCO, 3000 MHz - 4800 MHz |
相关代理商/技术参数 |
参数描述 |
|---|---|
| VCA821IDGSRG4 | 功能描述:运算放大器 - 运放 WB 40dB Adjust Range Linear RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| VCA821IDGST | 功能描述:运算放大器 - 运放 WB >40dB Adjust Rng Linear Vari Gain Amp RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| VCA821IDGSTG4 | 功能描述:运算放大器 - 运放 WB 40dB Adjust Range Linear RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| VCA821IDR | 功能描述:运算放大器 - 运放 WB >40dB Adjust Rng Linear Vari Gain Amp RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| VCA821IDRG4 | 功能描述:运算放大器 - 运放 WB 40dB Adjust Range Linear RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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