attiny13-20ss ATMEL Corporation, attiny13-20ss Datasheet - Page 88
attiny13-20ss
Manufacturer Part Number
attiny13-20ss
Description
8-bit Microcontroller With 1k Bytes In-system Programmable Flash - Atmel Corporation
Manufacturer
ATMEL Corporation
Datasheet
1.ATTINY13-20SS.pdf
(177 pages)
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Analog Input Circuitry
The analog input circuitry for single ended channels is illustrated in Figure 47. An analog
source applied to ADCn is subjected to the pin capacitance and input leakage of that
pin, regardless of whether that channel is selected as input for the ADC. When the chan-
nel is selected, the source must drive the S/H capacitor through the series resistance
(combined resistance in the input path).
The ADC is optimized for analog signals with an output impedance of approximately
10 k' or less. If such a source is used, the sampling time will be negligible. If a source
with higher impedance is used, the sampling time will depend on how long time the
source needs to charge the S/H capacitor, with can vary widely. The user is recom-
mended to only use low impedant sources with slowly varying signals, since this
minimizes the required charge transfer to the S/H capacitor.
Signal components higher than the Nyquist frequency (f
/2) should not be present to
ADC
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 47. Analog Input Circuitry
I
IH
ADCn
1..100 kΩ
C
= 14 pF
S/H
I
IL
V
/2
CC
ATtiny13
88
2535G–AVR–01/07
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