Applications information – Rainbow Electronics ADC0848 User Manual
Page 11
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Applications Information
(Continued)
The full-scale adjustment should be made with the proper
V
IN
(b) voltage applied by forcing a voltage to the V
IN
(a)
input which is given by
V
IN
(a) fs adjeV
MAX
b
1 5
(V
MAX
b
V
MIN
)
256
(
where V
MAX
e
the high end of the analog input range and
V
MIN
e
the low end (the offset zero) of the analog range
(Both are ground referenced )
The V
REF
(or V
CC
) voltage is then adjusted to provide a
code change from FE
HEX
to FF
HEX
This completes the ad-
justment procedure
For an example see the Zero-Shift and Span Adjust circuit
below
Zero-Shift and Span Adjust (2V
s
V
IN
s
5V)
TL H 5016 – 18
11
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