Philips Semiconductors
Product data
Single-chip 8-bit microcontroller with 10-bit A/D,
capture/compare timer, high-speed outputs, PWM
80C552/83C552
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
AV
1021
1022
)
1023
1024
AV (LSB
IN
Offset
error
OS
e
ideal
– AV
(1)
Example of an actual transfer curve.
The ideal transfer curve.
REF+
REF–
1 LSB =
(2)
(3)
(4)
(5)
1024
Differential non-linearity (DL ).
e
Integral non-linearity (IL ).
e
SU01693
Center of a step of the actual transfer curve.
Figure 1. ADC Conversion Characteristic
12
2002 Sep 03
NXP [ NXP ]
