SBOU286A October   2022  – December 2022 INA350 , INA351

 

  1.   DDF Instrumentation Amplifier Evaluation Module
  2.   Trademarks
  3. 1Overview
    1. 1.1 Features
    2. 1.2 Instrumentation Amplifier Pinout
    3. 1.3 Compatible Devices
  4. 2PCB Layout
  5. 3Schematic
  6. 4EVM 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 Other Passives
    6. 4.6 Miscellaneous
  7. 5Quick 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
  8. 6Bill of Materials
  9. 7Revision 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:
fo-cm=12π×R1×C1
Equation 2. Differential-mode cutoff frequency:
fo-dm=12π(R1+R2)(C2+C12)