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We use the AD8092

Schematics is here

If signal generator is a sinewave 1.6V peak-to peak, pin 1 is a sinewave 3.2V peak to peak, and pin 7 is a sinewave but the max amplitude saturates at 2.8V.

AD8092A behaves as a rail to rail. while AD8092B does not.

Furthermore the behavior slight changes form one chip to another. Test made on three boards.

Do you have a suggestion?