I'm using INAEVM-MSOP8 to test INA333 with below configuration. V+=3.3V, V- = 0V. REF=0.3V(not to GND shown in the picture), IN- to GND is 1.65V(add a 1.65V reference from IN- to GND), RG=536ohm, which sets GAIN=187.
when 2mV is added to IN+ to IN-, the output waveform is
when 10mV is applied to IN+ to IN-, the output waveform is
We are sure the power supply, the REF pin is very stable.
So why is there output ripple(about 190mV)?