Intel 8XC196MC User Manual

12-15

Note that the ideal characteristic possesses unique qualities: 

•

its first code transition occurs when the input voltage is 0.5 LSB; 

•

its full-scale code transition occurs when the input voltage equals the full-scale reference
voltage minus 1.5 LSB (V

REF

 – 1.5LSB); and

•

its code widths are all exactly one LSB. 

These qualities result in a digitization without zero-offset, full-scale, or linearity errors; in other
words, a perfect conversion.

FINAL CODE TRANSITION OCCURS

WHEN THE APPLIED VOLTAGE IS

EQUAL TO (Vref – 1.5 (LSB)).

ACTUAL CHARACTERISTIC OF

AN IDEAL A/D CONVERTER

FIRST CODE TRANSITION OCCURS

WHEN THE APPLIED VOLTAGE IS

EQUAL TO 1/2 LSB.

THE VOLTAGE CHANGE

BETWEEN THE ADJACENT CODE

TRANSITIONS (THE “CODE

WIDTH”) IS = 1 LSB.

1/2

1

2

3

4

5

6

7

8

6 1/2

0

1

2

3

4

5

6

7

INPUT VOLTAGE (LSBs)

Ø OUTPUT CODE, Q

A0083-01