ATTIny13-12PI ATMEL Corporation, ATTIny13-12PI Datasheet - Page 85
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ATTIny13-12PI
Manufacturer Part Number
ATTIny13-12PI
Description
8-bit AVR Microcontroller with 1K Bytes In-System Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATTINY13-12PI.pdf
(169 pages)
- Current page: 85 of 169
- Download datasheet (3Mb)
Analog Input Circuitry
2535B–AVR–01/04
The analog input circuitry for single ended channels is illustrated in Figure 46. 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
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
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 46. Analog Input Circuitry
or less. If such a source is used, the sampling time will be negligible. If a source
ADCn
I
IH
I
IL
1..100 k
ADC
/2) should not be present to
C
S/H
= 14 pF
ATtiny13
V
CC
/2
85
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