SBOU272 November   2021 INA2126 , INA2128

 

  1.   Trademarks
  2. 1Overview
    1. 1.1 Features
    2. 1.2 INA Pinout
    3. 1.3 Compatible Devices
  3. 2Quick Start
    1. 2.1 Dual-Supply Configuration
    2. 2.2 Single-Supply Configuration
      1. 2.2.1 Direct Reference Connection
      2. 2.2.2 Buffered-Reference Voltage Connection
  4. 3EVM Components
    1. 3.1 Power
    2. 3.2 Inputs
      1. 3.2.1 Input Filtering
    3. 3.3 Output
      1. 3.3.1 Output Filtering
    4. 3.4 Reference
    5. 3.5 Miscellaneous
  5. 4Schematic, PCB Layout, and Bill of Materials
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials

3.4 Reference

There are multiple methods of applying a reference voltage to the device. A straightforward approach is to apply a voltage to test point TP10 (TP18) with U1 and R5 (R25) not populated. If a buffered voltage is desired, U1 can be populated with an operational amplifier in an appropriate SOIC-8 (D) package and pinout. If the reference voltage is GND, R5 (R25) is populated with a 0-Ω resistor.

Reference voltage circuitry on the board provides numerous options for biasing the corresponding reference pins. The EVM layout allows for many configurations to bias the reference pin, such as: