Amey Deosthali <PICLIST@MITVMA.MIT.EDU> wrote:

> I want to use the PIC16C71 A/D converter. Is it possible to use the
> 20Mhz clock to get 8-bit accuracy from A/D? The specifications say
> that if we use the 20Mhz clock, Tad is violated.

    There are two ways to solve this, Amey...

    1.  Set the A?D Clock Source to "internal RC" (ADCS0 and ADCS1
        both set to "1").  This will give you a Tad of 2-6 uS
        (typically 4 uS), which is legal for the 16C71.

    2.  Use a 16C710 or 16C711 instead of the 16C71.  The '710 and
        '711 have a minimum Tad of 1.6 uS, which means that you can
        use a 20 MHz clock and set the A/D Clock Source to "32Tosc"
        (ADCS1 = 1, ADCS0 = 0).

    -Andy

=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499