NEC 78K0S/KA1+ User Manual page 175

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