In a message dated 11/15/01 3:15:19 PM Pacific Standard Time,
brandon@E-HA.COM writes:


> This AD7829 has a reference output of about 4v instead of 2.5 +/- 2% like
> specs say. I plug it in without any connections whatsoever (except -Chip
> Select) and it has this output.
>
> If anyone has experience in these I'de like to know why its doing this.
> Could it be burnt out? It seems to do conversions ok, except for the
> horribly off reference.
>
> Thanks.
>
> -brandon irwin
>


Well, according to the datasheet, either you can supply Vref or use the
internal Vref. They also mention decoupling the Vref pin to AGND via a .1uF
cap. They also the same for the Vmid pin. See if that helps.

-Tim

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.