MAC7200 datasheet(856/976 Pages) FREESCALE

Part #	MAC7200

Description	MAC7200 Microcontroller Family Reference Manual

PDF	976 Pages

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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856 / 976 page

Initialization/Application Information

MAC7200 Microcontroller Family Reference Manual, Rev. 2

778

Freescale Semiconductor

33.12.2.1.5

Gain Error Correction via GCC (Gain Too Low)

If the ATD transfer curve shows a gain that is too low (see green line in Figure 33-25) this can simply be

corrected by increasing the GCC. If done correctly, the ideal transfer curve and the actual transfer curve

will match and the TUE can be reduced to zero.

Figure 33-25. Gain Error (Gain Too Low) Compensated via GCC

33.12.2.2 Offset Error

Offset errors will lead to a constant TUE. The transfer curve will be clipped either at the beginning or the

end of the curve depending on the offset being negative or positive (see Figure 33-26). Offset errors can

easily be corrected by changing the OCC value.

TUEmax

VRH-VRL

VANx

Counts

0xFFF

VRH-VRL

Ideal transfer

curve

0x000

TUE [counts]

VANx

TUEmax

0xFFC

Gain too low

MAC7200 Datasheet(PDF) 856 Page - Freescale Semiconductor, Inc