Hi,
I have a bridge diff. signal and I want amplifier this signal with a Instrumentation Amplifier.
For that I use the INA 114.
the amplifier signal should be convert with a SAR ADC. The SAR ADC use a 3.3V power supply. The analog input pin is the P2_7. the corresponding AGround Pin 1 on conector J1. When I connect the following schematic the converted value is the Ref voltage. for that I thing there is a ground issue.
enclosed the schematic and the measured value.
many thanks you your support.
Carsten
