SBOU122B September   2013  – August 2016 INA118 , INA121 , INA122 , INA126 , INA129 , INA141 , INA155 , INA156 , INA188 , INA317 , INA818 , INA821 , INA828

 

  1.   Universal Instrumentation Amplifier Evaluation Module
    1.     Trademarks
    2. 1 Overview
      1. 1.1 Features
      2. 1.2 IA Pinout
      3. 1.3 Compatible Devices
    3. 2 PCB Layout
    4. 3 Schematic
    5. 4 EVM Components
      1. 4.1 Power
      2. 4.2 Inputs
        1. 4.2.1 Input Filtering
      3. 4.3 Output
        1. 4.3.1 Output Filtering
      4. 4.4 Reference
      5. 4.5 Prototype Area
      6. 4.6 Miscellaneous
    6. 5 Quick Start
      1. 5.1 Dual-Supply Configuration
      2. 5.2 Single-Supply Configuration
        1. 5.2.1 Direct-Reference Connection
        2. 5.2.2 Buffered-Reference Voltage Connection
    7. 6 Bill of Materials
      1. 6.1 Universal IA EVM Bill of Materials
    8. 7 Related Documentation from Texas Instruments
  2.   Revision History

4.2.1 Input Filtering

R1, R2, and C1 through C3 provide the ability to apply common-mode and differential-mode filtering to the inputs. The cutoff frequencies for the filters are shown in Equation 1 and Equation 2. For best performance, make C2 approximately ten times larger than C1 and C3.. These calculations presume R1 = R2 and C1 = C3.

Equation 1. Common-mode cutoff frequency: q_fc-cm_bou122.gif
Equation 2. Differential-mode cutoff frequency: q_fc-dm_bou122.gif