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Jack H

16.9 PRACTICE PROBLEMS

1. You need to read an analog voltage that has a range of -10V to 10V to a precision of +/-0.05V. What resolution of A/D converter is needed?

(ans.

10V – ( –10V)

 

7 bits = 128

R =

= 200

 

0.1V

 

8 bits = 256

The minimum number of bits is 8.

2.We are given a 12 bit analog input with a range of -10V to 10V. If we put in 2.735V, what will the integer value be after the A/D conversion? What is the error? What voltage can we calculate?