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Problem with AD5263

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

attachments.zip
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  • Hello koushik,

    I can't send you the waveform today, it will be tomorrow morning.

    A thing that I didn't say : there is a third device which is chained with the 2 AD5263 ; it's a DS1267S-10. I saw one thing ; the SPI signal which enters in it is very bad, but on the output, it is reformed.

    Concerning the frame, I will look at the program this afternoon, and I'll send you the information.

    Regards, Florian

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  • Hello koushik,

    I can't send you the waveform today, it will be tomorrow morning.

    A thing that I didn't say : there is a third device which is chained with the 2 AD5263 ; it's a DS1267S-10. I saw one thing ; the SPI signal which enters in it is very bad, but on the output, it is reformed.

    Concerning the frame, I will look at the program this afternoon, and I'll send you the information.

    Regards, Florian

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