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[原创]LinearLT6375±270V共模电压差分放大器办理方案

2017-11-23 06:36 PM| 发布者: 噗噗东| 查看: 1127| 评论: 0

摘要: Linear公司的LT6375是±270V是共模电压差分放大器,具有极好的DC精度,非常高的(±270V)输入共模电压和很宽电源电压范围,包罗有细密运算放大器和高度匹配的薄膜电阻网络,具有非常高的CMRR(97dB),极低的增益误差0.0035% ...

Linear公司的LT6375是 ±270V是共模电压差分放大器,具有极好的DC精度,非常高的(±270V)输入共模电压和很宽电源电压范围,包罗有细密运算放大器和高度匹配的薄膜电阻网络,具有非常高的CMRR(97dB),极低的增益误差0.0035% (35ppm)和极低增益漂移(1ppm/℃),主要用在高边或低边电流检测,双向宽共模电流检测,高压/低压电平转换,细密差分放大器,工业数据收罗前端和绝缘电路替代件.本文先容了LT6375主要特点,框架图,多种应用电路,以及演示板DC2443评估电路,电路图,质料清单和PCB设计原理图。

The LT6375 is a unity-gain difference amplifier whichcombines excellent DC precision, a very high input commonmode range and a wide supply voltage range. It includes aprecision op amp and a highly-matched thin film resistornetwork. It features excellent CMRR, extremely low gainerror and extremely low gain drift.

Comparing the LT6375 to existing difference amplifierswith high common mode voltage range, the selectableresistor divider ratios of the LT6375 offer superior systemperformance by allowing the user to achieve maximumSNR, precision and speed for a specific input commonmode voltage range.

The op amp at the core of the LT6375 has Over-The-Top®protected inputs which allow for robust operation in environmentswith unpredictable voltage conditions.

The LT6375 is specified over the C40℃ to 125℃ temperaturerange and is available in space-saving MSOP16and DFN14 packages.

LT6375主要特点:

±270V Common Mode Voltage Range
97dB Minimum CMRR (LT6375A)
0.0035% (35ppm) Maximum Gain Error (LT6375A)
1ppm/℃ Maximum Gain Error Drift
2ppm Maximum Gain Nonlinearity
Wide Supply Voltage Range: 3.3V to 50V
Rail-to-Rail Output
350μA Supply Current
Selectable Internal Resistor Divider Ratio
300μV Maximum Offset Voltage (LT6375A)
575kHz C3dB Bandwidth (Resistor Divider = 7)
375kHz C3dB Bandwidth (Resistor Divider = 20)
C40℃ to 125℃ Specified Temperature Range
Low Power Shutdown: 20μA (DFN Package Only)
Space-Saving MSOP and DFN Packages

LT6375应用:

High Side or Low Side Current Sensing
Bidirectional Wide Common Mode Range Current Sensing
High Voltage to Low Voltage Level Translation
Precision Difference Amplifier
Industrial Data-Acquisition Front-Ends
Replacement for Isolation Circuits

图1.LT6375功能框架图

图2.LT6375宽电压范围电流检测框架图

图3.LT6375 2阶巴特沃斯滤波器输出滤波器图

图4.LT6375电流丈量框架图

图5.LT6375通信电源监测框架图

图6.LT6375 27dB音频增益电路图

图7. LT6375 +/-5mAhowland(差分电压/电流转换电路)电流源电流源

图8. LT6375细密基准电压分压器/缓冲器电路

演示板DC2443

Demonstration Circuit 2443 is a Configurable High Voltage Amplifier featuring the LT®6375.

This demo board translates a high common mode signal to an output related to a low voltage reference level. The demo circuit is equipped with jumpers to facilitate set­ting the pin-strapped internal divider ratio configuration. The LT6375 is unique in that it may be powered from a low voltage (down to 3.3V) while it accepts signals well outside the supply range. This device is also unusual in that it can operate with high supply voltages (up to 50V). Connection points are provided to wire the amplifier in other configurations besides the simple translator.

图9.演示板DC2443评估测试图

图10.演示板DC2443电路图

图11.演示板DC2443 PCB元件结构图(顶层)
演示板DC2443质料清单见:
详情请复制打开此衔接地址:
http://cds.linear.com/docs/en/datasheet/6375fa.pdf
和http://cds.linear.com/docs/en/demo-board-manual/DC2443F.PDF
6375fa.pdf
DC2443F.PDF
DC2443A-1_SCH.PDF
演示板DC2443 PCB设计文件.zip


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