Datasheet

ADC0844, ADC0848
www.ti.com SNAS523D –JUNE 1999–REVISED MARCH 2013
Figure 14. Referencing Examples - Absolute with a Reduced Span
The full-scale adjustment should be made [with the proper V
IN
(−) voltage applied] by forcing a voltage to the V
IN
(+) input which is given by:
where
• V
MAX
= the high end of the analog input range
• V
MIN
= the low end (the offset zero) of the analog range. (Both are ground referenced.) (1)
The V
REF
(or V
CC
) voltage is then adjusted to provide a code change from FE
HEX
to FF
HEX
. This completes the
adjustment procedure.
For an example see the Zero-Shift and Span Adjust circuit below.
Figure 15. Zero-Shift and Span Adjust (2V ≤ V
IN
≤ 5V)
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