NEC mPD780024AS Series Preliminary User's Manual page 192

CHAPTER 11 8-BIT A/D CONVERTER ( µ PD780024AS SUBSERIES)
Figure 11-23. Example of Connection If Signal Source Impedance Is High
<Sensor internal circuit>
Output impedance
of sensor
Remark n = 0 to 3
192
ANIn
R0
C0
µ
C0 ≤ 0.1 F
Lowpass filter
is created.
Preliminary User's Manual U16035EJ1V0UM
<Microcontroller internal circuit>
R1
C1 C2
R2
C3