Part Number: OPA387
Hi Sir,
I am using an OPA387 amplifier in my design to measure current and display the reading on an LCD. The input current is up to 30 A, and I am using a 1 mOhm shunt resistor. The voltage drop across the shunt resistor is connected to the OPA387 op amp.
Here, 1 A corresponds to 1 mV, and the LCD will display this as 01.00. Since accuracy is very important for this application, I am concerned about the following measurements:
- When the input is 1 mV, the output is 1.8 mV.
- When the input is 6.5 mV, the output is 12.5 mV.
Please review the circuit and help me identify and fix the issue.
Regards,
Venkatesha