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TL064: Single Supply operation

Part Number: TL064
Other Parts Discussed in Thread: OPA2990

A Question from one of my customers:

"If we operate a TL064 opamp from a single ended 21.6 volt supply.  How close can we take the inputs to ground?"

We don't specify the TL064 for single supply operation, but I'm guessing that the TL064 can operate under the conditions above (Vcc=21.6V, Vss=0V).

And I'm also guessing that the common-mode input limits still apply and that the answer to the question above is "4V minimum" (4V above Vss).

Please confirm that assessment as well as whether or not Single Supply operation is OK.

Thanks!