I'm using a MCU to generate a sine-wave (as single ended signal) that is amplified and changed to differential signal with a OPA1632D.
The enable pin of the OPA1632D is used as a modulation input pin.
The circuit works correctly except when the OPA1632D stays inactive for several seconds.
On first image, you can see sine-wave generation (RED) and modulated signal (BLUE). Also you can see request message and on the right of image, the answer of the device.
On second image, you can see that the beginning of the request has been truncated so no answer from the device.
I also tested the signal that attacks the Enable pin of the OPA to check if any dysfonction, but the Enable signal is also correct.
On the datasheet the delay on the Enable signal is 2 us, but the OPA takes too much time to start, I don't know why.
FYI, when I keep sending request continuously there is no problem, only when the circuit is on hold for several seconds.
Please, what can I do to avoid this misfunctionning.