Rainbow Electronics ADC0848 - Manual (Page 11)

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