M37702E6BFS Renesas Electronics America, M37702E6BFS Datasheet - Page 232

• Manufacturer Part Number: M37702E6BFS
• Description: EPROM MCU/8BIT CMOS EMULATION CH
• Manufacturer: Renesas Electronics America

Specifications of M37702E6BFS

• Accessory Type: Emulator EPROM MCU
• For Use With/related Products: 7702
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

8.4 Absolute accuracy and differential non-linearity error
A-D CONVERTER
8.4 Absolute accuracy and differential non-linearity error
The A-D converter’s accuracy is described below.
Fig. 8.4.1 Absolute accuracy of A-D converter
8–12
8.4.1 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. The analog input voltage when measuring
the accuracy is assumed to be the mid point of the input voltage width that outputs the same output code
from an A-D converter with ideal characteristics. For example, when V
and 0 mV, 20 mV, 40 mV, 60 mV, 80 mV, ... are selected as the analog input voltages.
The absolute accuracy = ±3 LSB indicates that when the analog input voltage is 100 mV, the output code
expected from an ideal A-D conversion characteristics is “005
is between “002
The absolute accuracy includes the zero error and the full-scale error.
The absolute accuracy degrades when V
AV
CC
is “FF
16
(A-D conversion result)
.”
01
0B
0A
09
08
07
04
03
02
16
06
05
00
Output code
” to “008
16
16
16
16
16
16
16
16
16
16
16
16
0
16
20
.”
40
60
7702/7703 Group User’s Manual
REF
Analog input voltage (mV)
is lowered. The output code for analog input voltages V
80
–3 LSB
+3 LSB
100
120
16
140
,” however the actual A-D conversion result
160
REF
= 5.12 V, 1 LSB width is 20 mV,
180
Ideal A-D conversion
characteristics
200
220
REF
to