Other Parts Discussed in Thread: TEST,
I'm using following circuit for bidirectional current monitoring using LMP8601MA.
With these values, I'm wondering to obtain a Gr = 7.654 and output offset of Vs/2.
Input current range is +/-20mA, I used 10Ohm shunt resistor and a reduced gain in order to have an output range between 0-Vs, centered around Vs/2.
At 0mA, I expected output voltage of VCC/2, but I measured 0V. With +10mA, the voltage was 0.186V. I verified all connections and everything is ok.
After that, I tried to remove the 10nF, but nothing changed. Next step, I removed the 62kOhm resistor, knowing that the gain will be standard value G=20.
In this configuration, the output voltage since at 0mA was Vs/2, and it works fine giving positive and negative current (I set lower values to avoid output saturation).
I don't understand why my configuration doesn't work. Is there any limit in reducing gain? Bidirectional configuration is compatible with reduced gain application?
Please, help me to solve this issue.