AD4680: Is tQUIET always necessary for all the Fsclk?

Hi 

We will coordinate this to the product owner and get back to you. 

Thanks,

Jellenie

Hi Jellenie,

Thanks a lot for your follow. waiting for the update.

Best Regards,

Leo

Hi,

1. The tquiet is defined as the Interface quiet time before conversion, so this is the delay before it will have a new set of conversion or acquire time. This tquiet is required to all the frequency of the SCLK since this will make sure that the communication between the ADC and the microcontroller has ended and it is ready for a new set of conversion and acquisition.

2. Acquisition time overlaps on the later part of the conversion is approximately 140ns to 160ns after the start of conversion because this feature is available for AD4680 in which this overlap achieves a longer acquisition time allowing much time for the input signal to settle. Longer acquisition time gives you a wider range of flexibility on changing the RC filters to a larger value that will result in a higher bandwidth and filters the high-frequency signal that will enter the ADC.

Regards,
Andrei

Hi Andrei,

Thank you for the detailed explanation. 

In the Timing Diagram, tCSH and tQUIET describe the same period that looks a little strange and confusing.

Is that correct?

Best Regards,

Leo

Hi Leo,

The tQUIET of the AD4680 which has a minimum of 500ns can go down to 10ns as same as the tCSH. But going down to this time that same as the tCSH, the performance of the ADC will not be guaranteed and will result in a reduction in performance. 

Regards,

Andrei

Hi Andrei,
I will keep tQUIET above 500ns.thank you so much. 

Best Regards,

Leo