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### Topic: Default analog reference for DUE (Read 3356 times)previous topic - next topic

#### goncalor

##### Apr 20, 2013, 09:25 pm
Hey there.

I'm assembling a circuit here and I wondered "what is the default analog reference for DUE?" I looked it up but I couldn't find it. Since due runs at 3.3V I assume its default reference is 3.3V. But it may be 5V as well and I don't want to mess up...

#### Gericom

#1
##### Apr 20, 2013, 09:49 pm

Hey there.

I'm assembling a circuit here and I wondered "what is the default analog reference for DUE?" I looked it up but I couldn't find it. Since due runs at 3.3V I assume its default reference is 3.3V. But it may be 5V as well and I don't want to mess up...

It's 3,3v. But it can only read in a range from 1/6 to 5/6 of the reference voltage.

#### goncalor

#2
##### Apr 20, 2013, 11:50 pm
Ok, thanks. About that "1/6 to 5/6 range" of the reference voltage: any reason why it only reads in that range?

#3
##### Apr 21, 2013, 10:30 am
Quote
But it can only read in a range from 1/6 to 5/6 of the reference voltage.

Do you have a reference for that Gericom, crippling an ADC like that would be quite extraordinary and the data sheet states

Quote
The conversions extend from 0V to ADVREF

______
Rob

Rob Gray aka the GRAYnomad www.robgray.com

#### goncalor

#4
##### Apr 21, 2013, 12:36 pm
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crippling an ADC like that would be quite extraordinary

I, too, think that. It would be weird. Reading only from 1/6 to 5/6 would mean putting 1/3 of the values in the trash can...

#### Gericom

#5
##### Apr 22, 2013, 08:10 am

Quote
But it can only read in a range from 1/6 to 5/6 of the reference voltage.

Do you have a reference for that Gericom, crippling an ADC like that would be quite extraordinary and the data sheet states

Quote
The conversions extend from 0V to ADVREF

______
Rob

Oh, sorry. I remember. It was for the dac output. Then I think it can read fron 0-3.3v indeed.

#### goncalor

#6
##### Apr 25, 2013, 12:56 pm
Quote

Oh, sorry. I remember. It was for the dac output. Then I think it can read fron 0-3.3v indeed.

Ah, better now haha. Thanks Gericom.

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