80C552 Datasheet, PDF (12/23 Pages) NXP Semiconductors – Single-chip 8-bit microcontroller

Philips Semiconductors
Single-chip 8-bit microcontroller with 10-bit A/D,
capture/compare timer, high-speed outputs, PWM
Product data
80C552/83C552
14. The offset error (OS_e) is the absolute difference between the straight line which fits the actual transfer curve (after removing gain error), and
a straight line which fits the ideal transfer curve. (See Figure 1.)
15. The gain error (G_e) is the relative difference in percent between the straight line fitting the actual transfer curve (after removing offset error),
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_e) is the maximum difference between the center of the steps of the actual transfer curve of the non-calibrated
ADC and the ideal transfer curve.
17. This should be considered when both analog and digital signals are simultaneously input to port 5.
1023
1022
1021
1020
1019
1018
Offset
error
OS_e
Gain
error
G_e
(2)
7
(1)
Code
Out
6
5
(5)
4
(4)
3
(3)
2
1
1 LSB
(ideal)
0
1
2
3
4
5
6
7
Offset
error
OS_e
(1)
(2)
(3)
(4)
(5)
Example of an actual transfer curve.
The ideal transfer curve.
Differential non-linearity (DL_e).
Integral non-linearity (IL_e).
Center of a step of the actual transfer curve.
1018 1019 1020 1021 1022 1023 1024
AV_IN (LSB_ideal)
1 LSB = ^{AVREF+ – AVREF–}
1024
SU01693
Figure 1. ADC Conversion Characteristic
2002 Sep 03
12