Rainbow-electronics ADC0848 Manuel d'utilisateur télécharger pdf (Page 11)

Applications Information (Continued)

The full-scale adjustment should be made

[

with the proper

(

) voltage applied

]

by forcing a voltage to the V

(

)

input which is given by:

(

)fsadj

MAX

1.5

MAX

MIN

)

256

(

where V

MAX

the high end of the analog input range and

MIN

the low end (the offset zero) of the analog range.

(Both are ground referenced.)

The V

REF

(or V

) 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

5V)

TL/H/5016–18

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

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Rainbow-electronics ADC0848 Manuel d'utilisateur Page 11