Datasheet

249
8011O–AVR–07/10
ATmega164P/324P/644P
Signal components higher than the Nyquist frequency (f
ADC
/2) should not be present for either
kind of channels, to avoid distortion from unpredictable signal convolution. The user is advised
to remove high frequency components with a low-pass filter before applying the signals as
inputs to the ADC.
Figure 20-8. Analog Input Circuitry
ADCn
I
IH
1..100 kΩ
C
S/H
= 14 pF
V
CC
/2
I
IL