SBOU255 January   2021 INA183

 

  1. 1Trademarks
  2. 2Introduction and Overview
    1. 2.1 INA183
    2. 2.2 INA183EVM
    3. 2.3 Hardware Included
  3. 3Quick Start Setup and Use
    1. 3.1 Measurement With Shunt
    2. 3.2 Measurement Without Shunt
  4. 4INA183EVM Circuit
    1. 4.1 Rx03
    2. 4.2 Rx01, Rx02, Cx01, Cx02, Cx03
    3. 4.3 U1, U2 and U3
    4. 4.4 Voltage Inputs
  5. 5INA183EVM Schematic and PCB Layout
    1. 5.1 Schematic
    2. 5.2 PCB
  6. 6Bill of Materials

4.3 U1, U2 and U3

Ux is the device under test. Three device boards are supplied with the INA183EVM kit. Each board is populated with one of the available device gains. This allows users to test the devices and determine the gain setting that is best suited for a given application.

Here is a list of the factors involved in selecting the appropriate device.

  • The INA183 devices are identical with the exception of different gain settings.
  • The differential input voltage is either applied across the inputs or developed based on the load current that flows through the shunt resistor.
  • The limiting factor that requires attention to be given to device selection is the output voltage.
  • The selected device must allow the output voltage to remain within the acceptable range after the developed input voltage is amplified by the respective device gain. The output voltage must remain with the range of 50 mV above ground to 200 mV below the supply voltage.
  • An output below the minimum allowable output requires the selection of a device with a higher gain. Likewise, an output above the maximum allowable output requires the selection of a device with a lower gain.