DRV8313EVM: ADC GAIN of DC current sense

Hi Prabhat,

The DRV8313EVM has an external, non-inverting CSA. It can be seen here on the EVM schematic (found in the "Design Files" located on this webpage (LINK)):

The gain of this external CSA on the EVM is 33.2. The output offset for this configuration is approximately ± 3.32 mV, and the current sense offset is approximately ± 10 mA.

best,

Johnny

Hi Prabhat,

My apologies, I provided you with the expected offset error of this particular op amp in my previous post (± 3.32 mV). The resistor divider on the + pin of the op-amp biases the output at 1/2 of the 3.3V input since the two resistors of the voltage divider are equal. The output offset would be 1.65V.