AVR-Chat

Hi
 
No AVR has DAC but what resolution do you need and at what speed (it can
be done using the ADC and a PWM channel)
 
Regards
Lasse 
 
 
 
-----Original Message-----
From: tfcsd [mailto:tfcsd@earthlink.net] 
Sent: 27. oktober 2004 01:18
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] AVR with DAC?
 
I am using an non AVR application that uses 2 dacs that go 0-5v. Does
any AVR have dacs?

Lasse Madsen wrote:


Hi

>BTW, the built-in "Precision" ref is anything but... I'm running one
>prototype board with a M128 who's 2.56V ref measures 2.783V! 


This is a common problem if you consult the datasheet you will see it
specified with a large variation making it "unusable" for anything that
requires precision I'm using the VCC through a RCL network and this is
more accurate.
 
Regards
L. Madsen
 
 
-----Original Message-----
From: Bruce Parham [mailto:obparham@jpl.nasa.gov] 
Sent: 26. oktober 2004 18:27
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] AVR with DAC?
 


> Do any of the AVRs have a programmable voltage reference?  I've gone
> through some of the datasheets and it doesn't look like they do.
> 
> Mike

Not that I recall but, if you have an unused timer, you can put it into
PWM mode and connect its output to the AREF pin via a suitable R-C
filter. 

Bruce



 




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