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Interfacing AD7680 with PIC

 
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akshaymathur39



Joined: 05 Aug 2008
Posts: 11

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Interfacing AD7680 with PIC
PostPosted: Tue Mar 30, 2010 11:41 am     Reply with quote
Dear Friends,

I am new to A/D converter and wondering if someone has written a driver for interfacing AD7680 with PIC.

Please let me know if somebody has done this. Looking forward to some positive replies.

Best regards,
Akshay
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Mar 30, 2010 1:53 pm     Reply with quote
The AD7680 is similar to the AD7799, which has a driver in this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=41059

But with the AD7680, you can't write to the chip, so the line for
ad7799_write_config(0x0010) should not be called in the
ad7799_init() routine. Just comment that line out.

Also, the 24-bit output data word has 4 trailing zero bits, so it must be
shifted 4-bits to the right, to right-justify it. Just do this to the retval
value, just before it's returned from the ad7799_read_data() routine:
Quote:

retval >>= 4; // Right-justify the result

return(retval);
}
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