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LM1972 / IN2 pin treatment

Hi,

We have obtained two questions from our customers.

1.

Our customers will use only 1-channel( IN1 pin).

In the case,We attempt to treat IN2-pin open.

Is it correct? 

2.

About Electrical Characteristics of the Data Sheet.

The item of Supply Current Conditions indicate 「Inputs are AC Grounded」.

What does that mean?

Could you tell us these.

Best Regards,

Kato