AnsweredAssumed Answered

AD779 channel 3 doesn't work

Question asked by arek_wala on Dec 11, 2017
Latest reply on Dec 18, 2017 by JellenieR

Hello everyone,

 

I'm using AD7793 and almost everything is fine, but I have problems with channel 3.

In my application I have to measure all 3 channels sequently. Channels 1 and 2 works great, but not third one. I'am using standard commands for Configuration Register:

 

0x1080   - unipolar mode, internal reference 1,17V, channel 1  --> ok

0x1081  -  unipolar mode, internal reference 1,17V, channel 2  --> ok

0x1082  -  unipolar mode, internal reference 1,17V, channel 3 -> I get always 0's

 

When I try set buffered mode on channel 3 it starts read something, but the result is about 4x lower than it should be.

 

I read the whole datasheet and I don't know what I'm doing wrong. Is there some special threatment for channel 3? Should I set something more than on the others 2 channels?

 

Sorry for my english, I hope this post is understandable:)

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