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AD7685: SDO

Question asked by Mr.K on Aug 17, 2015
Latest reply on Aug 28, 2015 by KarenNE

Hello,

 

I am using AD7685, and the mode is CS Mode 3-Wire with Busy.

In this mode, SDO goes high because it is a pull-up when the analog to digital conversion starts.

 

In the data sheet, the pull-up of SDO is 47KΩ.

 

AD7685.jpg

 

In the pull-up of 47KΩ, it goes slowly high.

 

AD7685_PullUp_47K.jpg

In the pull-up of 4.7KΩ, it is improved.

However, the response is still smooth.

 

AD7685_PullUp_4_7K.jpg

Could you tell me the value of a correct pull-up resistor?

 

Best Regards,

Mr.K

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