80C552 datasheet(12/23 Pages) PHILIPS

12 / 23 page

Philips Semiconductors

Product data

80C552/83C552

Single-chip 8-bit microcontroller with 10-bit A/D,

capture/compare timer, high-speed outputs, PWM

2002 Sep 03

14. The offset error (OSe) 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 (Ge) 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 (Ae) 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.

SU01693

1018

1019

1020

1021

1022

1023

1018

1019

1020

1021

1022

1023

1024

Code

Out

(2)

(1)

(5)

(4)

(3)

1 LSB

(ideal)

Offset

error

OSe

Offset

error

OSe

Gain

error

AVIN (LSBideal)

1 LSB =

AVREF+ – AVREF–

1024

(1)

Example of an actual transfer curve.

(2)

The ideal transfer curve.

(3)

Differential non-linearity (DLe).

(4)

Integral non-linearity (ILe).

(5)

Center of a step of the actual transfer curve.

Figure 1. ADC Conversion Characteristic

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