Harold,

I was trying to keep away from 12-bit A/D's due to cost reason. I have=20
the uP and it have a 10-bit A/D. If there are any 12-bit A/D's available=20
at a good price oh well its another situation. Suggestions?

/Ake

Harold Hallikainen wrote:

>Seems complicated to me! I'd be concerned about the stability of the
>differential amplifier (if you're trying to build the diff amp yourself)=
,
>stability of the PWM output, ripple of the PWM output, etc. IF the
>transducer indeed has the resolution and accuracy you're seeking, it see=
ms
>a simpler approach is to use an external A/D that has more resolution. I
>did a precision thermometer using a Data Acquisition System chip from
>Maxim. It, as I recall, has a 16 bit delta sigma A/D, a 10 bit D/A, and =
a
>real time clock. Simple to interface to the PIC with SPI.
>
>Harold
> =20
>


--=20
 ---
Ake Hedman (YAP - Yet Another Programmer)
eurosource, Brattbergav=E4gen 17, 820 50 LOS, Sweden
Phone: (46) 657 413430 Cellular: (46) 73 84 84 102
Company home: http://www.eurosource.se     =20
Kryddor/Te/Kaffe: http://www.brattberg.com
Personal homepage: http://www.eurosource.se/akhe
Automated home: http://www.vscp.org


--=20
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