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ATmega165 Datasheet(PDF) 197 Page - ATMEL Corporation

Part # ATmega165
Description  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  336 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega165 Datasheet(HTML) 197 Page - ATMEL Corporation

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197
ATmega165/V
2573G–AVR–07/09
Analog Noise Canceling
Techniques
Digital circuitry inside and outside the device generates EMI which might affect the
accuracy of analog measurements. If conversion accuracy is critical, the noise level can
be reduced by applying the following techniques:
1.Keep analog signal paths as short as possible. Make sure analog tracks run
over the analog ground plane, and keep them well away from high-speed
switching digital tracks.
2.The AVCC pin on the device should be connected to the digital V
CC supply volt-
age via an LC network as shown in Figure 91.
3.Use the ADC noise canceler function to reduce induced noise from the CPU.
4.If any ADC port pins are used as digital outputs, it is essential that these do not
switch while a conversion is in progress.
Figure 91. ADC Power Connections
VCC
100nF
Analog Ground Plane
(ADC0) PF0
(ADC7) PF7
(ADC1) PF1
(ADC2) PF2
(ADC3) PF3
(ADC4) PF4
(ADC5) PF5
(ADC6) PF6
AREF
GND
AVCC
52
53
54
55
56
57
58
59
60
61
61
62
62
63
63
64
64
1
51
PA0
10
μΗ
GND



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