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DAC PROBLEM on 16f877

 
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jruibarroso



Joined: 07 Jan 2006
Posts: 64
Location: Braga

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DAC PROBLEM on 16f877
PostPosted: Thu Feb 02, 2006 2:19 pm     Reply with quote
Is possible to use analogs ports to output 0 ..5 v on a PIC 16F877 ?
kender



Joined: 09 Aug 2004
Posts: 768
Location: Silicon Valley

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PostPosted: Thu Feb 02, 2006 2:34 pm     Reply with quote
No. The analog ports on 16F877 (and I think on the rest of the PICs to) are either analog inputs or digital I/O. However, aside from buying a separate DAC chip, you can build a cruide DAC out of a PWM output, a low-pass filter and feedback to the PIC's A/D. This technique has been discussed in this forum:

http://www.ccsinfo.com/forum/viewtopic.php?t=19899
http://centauri.ezy.net.au/~fastvid/picsound.htm
Eugeneo



Joined: 30 Aug 2005
Posts: 155
Location: Calgary, AB

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PostPosted: Fri Feb 03, 2006 12:40 am     Reply with quote
Take a look at the Mchip TC1321
I used this quite a while ago but it worked great.

It's a 8 pin soic with a 12 bit res.
No opamp/fet required.
SPI


And you can set it up in about 1 hour

http://www.microchip.com/ParamChartSearch/chart.aspx?branchID=11028&mid=11&lang=en&pageId=79
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