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Problem with AD5263

Question asked by florianperrichon on Jul 25, 2017
Latest reply on Aug 22, 2017 by florianperrichon

Hello,

 

For an application, I use 2 AD5263 in SPI (see attach, "Capture.PNG).

 

The frequency of the SPI input signal (SDIMESURES) is 2,5Mhz (see attach SDIMESURES2,5MHz).

The problem I have is that my signal is damaged on the output of the first AD5263 (SDOMESESURES2,5MHz, see attach) and even more on the output of the second AD5263 (POT2,5MHz, see attach).

 

How can I do to have steep fronts? I saw in the datasheet :

 

" It is recommended to increase the clock period when using a pull-up resistor to the SDI pin of the following device because capacitive loading at the daisy-chain node (SDO to SDI) between devices may induce time delay to subsequent devices"

 

I try to change my frequency to 1,25MHz, but nothing change, my fronts are also longer (SDOMESURES1,25MHz, see attach).

 

If you have any suggestions, I would be very happy :-). Excuse my poor English, I'm French.

 

Regards, Florian

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