RE: eQADC operation on MPC5554

"Dees Randy-rsaf30" <[email protected]> Tue, 14 Nov 2006 10:53:02 -0700

Newsgroups	gmane.comp.hardware.motorola.microcontrollers
Message-ID	<3CCF040BDA7E0A46B3DF0F6B4741630ACFC1F3@az33exm23.fsl.freescale.net>

are you performing calibration? see AN 2989 - Design, Accuracy, and
Calibration of Analog to Digital Converters on the MPC5500 Family.
http://www.freescale.com/files/32bit/doc/app_note/AN2989.pdf

________________________________

From: [email protected] [mailto:[email protected]] On Behalf
Of JVB1_wow
Sent: Tuesday, November 14, 2006 11:37 AM
To: [email protected]
Subject: [MPC500] eQADC operation on MPC5554

Hello,
I am designing a system with the MPC5554 micro-controller. We are
planning on using the eQADC. Checkout of the prototype hardware shows
a large offset voltage of around -0.900V. The measured data in
perfectly linear just offset by this bias. Anyone seen this before? 
Thanks.

Joe

.

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