ATmega16 datasheet(207/315 Pages) ATMEL

부품명	ATMEGA16

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

PDF	315 Pages

Scroll/Zoom	100%

제조업체	ATMEL [ATMEL Corporation]

홈페이지	http://www.atmel.com

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207 / 315 page

207

ATmega16(L)

2466E–AVR–10/02

Figure 105. Analog Input Circuitry

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:

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.

The AVCC pin on the device should be connected to the digital V

CC supply

voltage via an LC network as shown in Figure 106.

Use the ADC noise canceler function to reduce induced noise from the CPU.

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 106. ADC Power Connections

ADCn

IIH

1..100 k

Ω

CS/H= 14 pF

VCC/2

IIL

PA4 (ADC4)

PA5 (ADC5)

PA6 (ADC6)

PA7 (ADC7)

AREF

AVCC

GND

PC7

ATMEGA16 데이터시트(PDF) 207 Page - ATMEL Corporation