M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 424

• Manufacturer Part Number: M30622MA-XXXFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
• Manufacturer: RENESAS [Renesas Technology Corp]

A-D Converter
Figure 2.7.26. Absolute accuracy (10-bit resolution)
2.7.13 Absolute Accuracy and Differential Non-Linearity Error
• Absolute accuracy
Absolute accuracy is the difference between output code based on the theoretical A-D conversion
characteristics, and actual A-D conversion result. When measuring absolute accuracy, the voltage at
the middle point of the width of analog input voltage (1-LSB width), that can meet the expectation of
outputting an equal code based on the theoretical A-D conversion characteristics, is used as an ana-
log input voltage. For example, if 10-bit resolution is used and if V
then 1-LSB width becomes 5 mV, and 0 mV, 5 mV, 10 mV, 15 mV, 20 mV, ···· are used as analog input
voltages. If analog input voltage is 25 mV, “absolute accuracy =
A-D conversion falls on a range from “002
pected from the theoretical A-D conversion characteristics. Zero error and full-scale error are included
in absolute accuracy.
Also, all the output codes for analog input voltage between V
Output code
(result of A-D conversion)
00B
00A
009
008
007
006
005
004
003
002
001
000
16
16
16
16
16
16
16
16
16
16
16
16
0
5
10 15
Analog input voltage (mV)
20
–3LSB
+3LSB
25
16
30
” to ”008
35
16
40
” though an output code, “005
Theoretical A-D conversion
characteristic
45
REF
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
and AVcc becomes “3FF
50
3LSB” refers to the fact that actual
REF
(reference voltage) = 5.12 V,
55
Mitsubishi microcomputers
M16C / 62 Group
16
”, can be ex-
16
”.
409