Can I have spec on pin VIN(+) VIN(-)
1. common mode voltage
2. input impedance
3. any clamping circuit inside?
Let me check on these parameters and get back to you asap.
I have got some information for you.
For common mode, we only quote the differential input voltage range, +/-Vref for this part. The best place to have input common mode is in the middle if possible.
On the input impedance. We have not measured this directly but you can use the Average VIN Input Current specification per V in the datasheet to estimate it.
Lastly on clamping circuits. There are ESD diode clamps to GND and Vdd on the inputs.
I hope this helps.
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