ATmega165 datasheet(197/336 Pages) ATMEL

부품명	ATmega165

상세설명	8-bit Microcontroller with 16K Bytes In-System Programmable Flash

PDF	336 Pages

Scroll/Zoom	100%

제조업체	ATMEL [ATMEL Corporation]

홈페이지	http://www.atmel.com

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197 / 336 page

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

PA0

μΗ

GND

ATmega165 데이터시트(PDF) 197 Page - ATMEL Corporation