Philips Semiconductors
Product specification
Single-chip 8-bit microcontroller
80C552/83C552
13.The integral non-linearity (IL ) is the peak difference between the center of the steps of the actual and the ideal transfer curve after
e
appropriate adjustment of gain and offset error. (See Figure 1.)
14.The offset error (OS ) is the absolute difference between the straight line which fits the actual transfer curve (after removing gain error), and
e
a straight line which fits the ideal transfer curve. (See Figure 1.)
15.The gain error (G ) is the relative difference in percent between the straight line fitting the actual transfer curve (after removing offset error),
e
and the straight line which fits the ideal transfer curve. Gain error is constant at every point on the transfer curve. (See Figure 1.)
16.The absolute voltage error (A ) is the maximum difference between the center of the steps of the actual transfer curve of the non-calibrated
e
ADC and the ideal transfer curve.
17.This should be considered when both analog and digital signals are simultaneously input to port 5.
Offset
error
Gain
error
OS
e
G
e
1023
1022
1021
1020
1019
1018
(2)
7
6
5
(1)
Code
Out
(5)
4
3
(4)
(3)
2
1
0
1 LSB
(ideal)
1
2
3
4
5
6
7
1018
1019
1020
1021
1022
)
1023
1024
AV (LSB
IN
Offset
error
OS
e
ideal
AV
– AV
REF–
REF+
1024
1 LSB =
(1) Example of an actual transfer curve.
(2) The ideal transfer curve.
(3) Differential non-linearity (DL ).
e
(4) Integral non-linearity (IL ).
e
(5) Center of a step of the actual transfer curve.
Figure 1. ADC Conversion Characteristic
12
1998 Aug 13
NXP [ NXP ]
