Hi, in datasheet sector:
7.4.3 Input Bias Current Return Path
The picture shows that we could connect 10kohm between one input to GND.
But I think in this case the common mode input voltage is still almost 0, right?
Then the common mode input range is still violated, right?
Since the common mode range is V- +0.1V to V+ -1.5V, right?
Justifice,
This would be true if you use a single supply voltage. However, if you use a dual supply like +/5V, the input range would be from -4.9V to +3.5V and thus would include the ground.
Please download the TI engineering calculator by clicking on the link below and use Vcm vs Vout for Instrumentation Amplifier to determine INA188 valid input/output ranges for given supply, gain and reference voltage - see example below.
https://www.ti.com/tool/ANALOG-ENGINEER-CALC?keyMatch=INA%20CALCULATOR
Having said that, for a single supply thermocouple or thermopile application, instead of INA188 it would be better to use an op amp like OPA387 - see below.
