CHAPTER 10 A/D CONVERTER
User’s Manual U16898EJ3V0UD
175
(10) Internal equivalent circuit
The equivalent circuit of the analog input block is shown below.
Figure 10-21. Internal Equivalent Circuit of ANIn Pin
ANIn
C
OUT
C
IN
R
IN
LSI internal
R
OUT
Table 10-3. Resistance and Capacitance Values (Reference Values) of Equivalent Circuit
AV
REF
R
OUT
R
IN
C
OUT
C
IN
4.5 V
≤
AV
REF
≤
5.5 V
1 k
Ω
3
k
Ω
8 pF
15 pF
2.7 V
≤
AV
REF
< 4.5 V
1 k
Ω
60
k
Ω
8 pF
15 pF
Remarks 1.
The resistance and capacitance values shown in Table 10-3 are not guaranteed values.
2.
n = 0 to 3
3.
R
OUT
: Allowable signal source impedance
R
IN
: Analog input equivalent resistance
C
IN
: Analog input equivalent capacitance
C
OUT
: Internal pin capacitance