SLYA042
July 2024
FDC1004
,
FDC1004-Q1
1
Abstract
Trademarks
1
Introduction
2
CSAs and Input Bias Stage
3
CSA and Gain Error Factor
4
Applications for Resistance at Input Pins of Current Sense Amplifiers
4.1
Input Resistance Design Considerations
5
Applications for Input Resistance at Reference Pins of Current Sense Amplifiers
5.1
Bidirectional CSA and Applications
5.2
Driving CSA Reference Pin With High-Resistance Source Voltage
5.3
Input Resistance at Reference Pin Design Considerations
6
Design Procedure and Error Calculation for External Input Resistance on CSA
6.1
Calculating eEXT for INA185A4 With 110Ω Input Resistors
7
Design Procedure for Input Resistance on Capacitively-Coupled Current Sense Amplifier
7.1
Bench Verification of Input eEXT for Capacitively-Coupled Current Sense Amplifiers
8
Design Procedure for Input Resistance at CSA Reference Pins
9
Input Resistance Error Test with INA185 Over Temperature
9.1
Schematic
9.2
Methods
9.3
Theoretical Model
9.4
Data for INA185A4 with 110Ω Input Resistors
9.4.1
Data Calculations
9.5
Analysis
10
Input Resistance Error Test with INA191 Over Temperature
10.1
Schematic
10.2
Methods
10.3
Theoretical Model
10.4
Data for INA191A4 With 2.2kΩ Input Resistors
10.4.1
Data Analysis
10.5
Analysis
11
Derivation of VOS, EXT for a Single Stage Current Sense Amplifier (CSA)
12
Summary
13
References
User's Guide
Input Resistance Error for Current Sense Amplifiers