Document Number: 002-10635 Rev. *I
Page
254 of 325
S6J3310/20/30/40 Series
9.1.5.2
Notes on A/D Converters
About the Output Impedance of an External Circuit for Analog Input
When the external impedance is too high, the analog voltage sampling time may become insufficient. In this case, we recommend
attaching a capacitor (about 0.1 µF) to an analog input pin.
Analog input circuit model
R C
12-bit A/D 3.9 kiloohms (max) 11.0 pF (max) (4.5 V ≤ AV
CC
5 ≤ 5.5 V)
Note: Use the numerical values provided here simply as a guide.
R
C
Sampling ON
Comparator
Analog input