Anonymous
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Feb 21, 2013
08:54 AM
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Feb 21, 2013
08:54 AM
I am making a design for test of DELSIG-ADC, Basically it's working, Then I think how to get more precise resolution. Finally want to compensate the offset. But which radix of the offset? In actual ADC value? Or converted value to u/m/ V? I don't know, One reason is no offset value has not able to get. Even It seems has some offset value, But always these value are ZERO, Is it OK? Configuration: [ resolution: 20bit, rate: 10/sec, continuous conversion, input mode: single-end, buffer mode: rail-to-rail, range: 0-6*vref, Vref: 1.024v ] Regards, Happy ADC
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PSoC 3
3 Replies
Feb 21, 2013
03:13 PM
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Feb 21, 2013
03:13 PM
"Finally want to compensate the offset. But which radix of the offset? In actual ADC value?
Or converted value to u/m/ V?"
You can work in either, but working directly with ADC counts would eliminate math error contribution
due to scale factors if you were to work in converted value.
Not sure why you are getting 0 as ADC count for Vin = 0, you should see some offset.
Regards, Dana.
Anonymous
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Feb 21, 2013
07:29 PM
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Feb 21, 2013
07:29 PM
Hi Dana-san, thank you. The radix is presumed as adc count, because commonly number is count, Each converted value is depend on what unit user is use. Anyway, i have all source code then check up, it described [ Parameters: int32 offset : Offset in counts ] OK, nonetheless offset is always zero, measured value was change when every i did zero-in procedure. (this design can do zero-in when Sw was pushed) Single-end mode and rail-to-rail drive that can't measure offset value when input is zero ? right? A question is still remain but it's not a deal, not to hurry. Thank you, Happy ADC!
Anonymous
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Feb 21, 2013
09:07 PM
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Feb 21, 2013
09:07 PM