m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 330

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

characteristics,” also.
12.4 Absolute accuracy and Differential non-linearity error
The A-D converter’s accuracy is described below. Refer to section “Appendix 10. 4. A-D converter standard
Fig. 12.4.1 Absolute accuracy of A-D converter (10-bit resolution mode)
12.4.1 Absolute accuracy
The absolute accuracy is the difference expressed in the LSB between the actual A-D conversion result
and the output code of an A-D converter with ideal characteristics. (See Figure 12.4.1 for more details.)
The analog input voltage at measurement of the absolute accuracy is assumed to be the mid point of the
analog input voltage width that outputs the same output code from an A-D converter with ideal characteristics.
For example, in the case of the 10-bit resolution mode, when V
mV, 5 mV, 10 mV, 15 mV, 20 mV, ... are selected as the analog input voltages.
The absolute accuracy = ±3 LSB indicates that when the analog input voltage is 25 mV, the output code
expected from an ideal A-D conversion characteristics is “005
between “002
The absolute accuracy includes the zero error and the full-scale error.
The absolute accuracy degrades when V
in the range from V
(A-D conversion result)
16
” to “008
00B
00A
009
008
007
006
005
004
003
002
001
000
Output code
16
16
16
16
16
16
16
16
16
16
16
16
REF
0
to Vcc is “3FF
16
.”
5
12.4 Absolute accuracy and Differential non-linearity error
10
15
16
7905 Group User’s Manual Rev.1.0
.”
REF
Analog input voltage (mV)
20
is lowered. Any of the output codes for analog input voltages
+3 LSB
–3 LSB
25
30
35
16
REF
,” but the actual A-D conversion result is
40
= 5.12 V, 1 LSB width is 5 mV, and 0
45
Ideal A-D conversion
characteristics
A-D CONVERTER
50
55
12-19