Datasheet

M16C/6S Group IT800AFE (Analog Front End)
R01DS0201EJ0502 Rev.5.02 page 190 of 203
Dec 25, 2012
(b)ADC (Analog to Digital Converter)
The output of the channel filter (maximum of three) connected outside is connected to 1 bit ADC which
consists of an operational amplifier and a comparator.
M16C/6S build in ADC of three equivalent performances. The circuit of one ADC has composition
shown in the following figure.
Three ADC use all three by the signal zone to be used. The constant of a filter is set up as shown in the
following table.
Figure 1.23.4 ADC block diagram
Table 1.23.3 The example of an ADC part constant setting
C1
R1
33
33
10
R2 R3
10 12
10
C2 C3 Unit
Unit
Parts
Parts
Register
Capacitor
Application
characteristic
Application
characteristic
FCC/ARIB
CECLEC-B
FCC/ARIB
CECLEC-B
10 pF
pF
22
AMP1_IN/
AMP1_Out/AMP2_Out/ CH1_InP/CH2_InP/
CH3_InPAMP3_Out
AMP2_IN/
AMP3_IN/
Vref
CH1_InN/CH2_InN/ FB1/FB2/FB3
CH3_InN
3.3V
10k
10k
1k
R1/R2/R3
C1/C2/C3
Channel
Filter
Amplifier
Comparator
+
+
-
-
0.22 F
0.1
F
0.1 F