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Please help check on strange SDO of AD7682

Question asked by richiechen on Jan 3, 2013
Latest reply on Jan 9, 2013 by richiechen

Hi everyone

 

I am using AD7682. The output of AD7682(SDO) is quite strange, which is shown in the diagram.

 

System description:

AD7682 is controlled by a microcontroller. The AD7682 CFG is configured as 0b11110010110001. Read After Conversion mode is selected. The following diagram is the schematic:

SCHEMATIC.jpg

 

 

The following diagrams are the SDO vs CLK, which are strange:

3V.png

The first diagram is when the Channel is connected with 3V.

 

0V.png

The second is when the Channel is connected with 0V.

 

It seems that the time for the last bit to discharge is quite long. Is the guess correct?

Or what does the "SLOPE" imply?

 

 

Thank you very much.

 

Best regards

Richie CHEN

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