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ADA4950-2 Input Current Specification


I am using ADA4950-2 Differential Amplifier to make  differential my DC signal. I hve a output common mode voltage of 1.5 V for this chip
I have two questions:

1) When nothing is connected to INA- and 1.65 V is connected to INA+ I see 1.47 V(apporixmately output common mode voltage) at INA- pin. What could be the reason for this?

2) I have a system with 1.65V -2.65 V changing DC level input for 1.5 V common mode voltage in this chip? What will be the input current for this sitiuation?( (Vin-Vocm)/500 ohm is a suitable approximation???)

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