Nope, actually, cancel that.
2% is an expression of the sum of ADC and DAC errors. ADC alone has a very consistent 5% error when readings are taken in reference with the external source.
I'm assuming I'll find a DAC error to be about 3% and "in an opposite direction", resulting in 2% net error when they are tied with a jumper wire.
If that can't be addressed at least to some extent, I think it should at least mentioned somewhere because when a description says:
Dual 1 MSPS 12 bit true analog DAC
Dual 1 MSPS 12 bit ADC
A beginner like myself (who, as we've established, these boards are targeted at) would not assume there could be an unspoken assumption that 5% error in readings is not an odd thing to happen.
ADC readings off on Itsy Bitsy M4
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- Bekar_T
- Posts: 22
- Joined: Wed Apr 21, 2021 12:41 am
Re: ADC readings off on Itsy Bitsy M4
Wellp, now I'm confused.
DAC output has barely 0.5% error when measured independently.
So main source of error is ADC and it varies A LOT depending on . . . I don't know what.
Does this mean that even if I go through the labors of calibrating and compensating for the error in ADC, it will still need adjusting in every specific circuit configuration?
DAC output has barely 0.5% error when measured independently.
So main source of error is ADC and it varies A LOT depending on . . . I don't know what.
Does this mean that even if I go through the labors of calibrating and compensating for the error in ADC, it will still need adjusting in every specific circuit configuration?
Please be positive and constructive with your questions and comments.