I have 50 seperate logic lines  that switch in sequence from # 1 to # 50 =
then reverse from # 50 to # 1
at any one time only one line is in a low state  and all others are high =
state. what I need is an analog output
voltage generated from the pic in response to which switched line is =
enabled.
example:

 max reference voltage output is 1 volt at line 50 switched on.=20
 half of the reference voltage is 500 mv at line 25 switched on.
 each switched line represents a 20 mv  change in output voltage.
=20
 these parameters are not set in stone and the analog reference voltage =
could
change if it made code and chip selection easier.

any thoughts on which pic chip to use  as i have not bought any chips =
yet.
is there a simple  mixed signal  or  d/a chip that will do this instead =
of using a pic chip?
it seems that this type of digital line switching (single line enabled =
only )=20
to generate an analog voltage is really not what the D/A chips do that =
are
presently out there on the market. well as easy as this application =
seems to be
 i want to ask before  i begin  re-inventing  sliced bread....

thanks alot  for reading this and all comments and suggestions welcome   =
      tims 800

 =20

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