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

4.4 Reference

There are multiple methods of applying a reference voltage to the device. A straightforward approach is to apply a voltage to the VREF test point with U2 unpopulated. If a buffered voltage is desired, then U2 can be populated with an operational amplifier in an appropriate DBV package with the OUT pin on pin 1. Ensure the series resistor R15, as well as any accompanying passive components, are populated before using the reference buffer.

If the reference voltage is GND, then either R17 can be populated with a 0-Ohm resistor or the VREF test point can be connected to GND. When grounding the reference pin, ensure R15 is not populated.