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参数资料
| 型号： | VCA821IDG4 |
| 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, MS-012AB, SOIC-14 |
| 文件页数： | 18/36页 |
| 文件大小： | 1276K |
| 代理商： | VCA821IDG4 |
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OUTPUT VOLTAGE DYNAMIC RANGE
OFFSET ADJUSTMENT
BANDWIDTH
+V
IN
R
G+
R
G-
-VIN
FB
R
G
50W
10kW
1kW
50W
V
IN
VCA821
R
F
0.1 F
m
0.1 F
m
10kW
4kW
+5V
-5V
V
OUT
+5V
-5V
InputStageandMultiplexerCore
OffsetCompensationCircuit
OutputStageOffset
CompensationCircuit
www.ti.com ....................................................................................................................................... SBOS407B – DECEMBER 2007 – REVISED DECEMBER 2008
With its large output current capability and its wide
As a result of the internal architecture used on the
output voltage swing of ±3.9V typical on 100
load, it
VCA821, the output offset voltage originates from the
is easy to forget other types of limitations that the
output stage and from the input stage and multiplier
VCA821 can encounter. For these limitations, careful
core. Figure 85 shows how to compensate both
analysis must be done to avoid input stage limitation:
sources of the output offset voltage. Use this
either voltage or IRG current. Note that if control pin
procedure to compensate the output offset voltage:
VG varies, the gain limitation may affect other aspects
starting with the output stage compensation, set
of the circuit.
VG = –1V to eliminate all offset contribution of the
input stage and multiplier core. Adjust the output
stage offset compensation potentiometer. Finally, set
VG = +1V to the maximum gain and adjust the input
The output stage of the VCA821 is a wideband
stage
and
multiplier
core
potentiometer.
This
current-feedback amplifier. As such, the feedback
procedure effectively eliminates all offset contribution
resistance is the compensation of the last stage.
at the maximum gain. Because adjusting the gain
Reducing the feedback element and maintaining the
modifies the contribution of the input stage and the
gain constant limits the useful range of IRG, and
multiplier core, some residual output offset voltage
therefore, reduces the gain adjust range. For a given
remains.
gain, reducing the gain element limits the maximum
achievable output voltage swing.
Figure 85. Adjusting the Input and Output Voltage Sources
Copyright 2007–2008, Texas Instruments Incorporated
25
Product Folder Link(s): VCA821
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| VCA821IDGSR | 功能描述:运算放大器 - 运放 WB 40dB Adj Rng Lin Variable 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 |
| 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 |
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