PIC16F916-I/ML【PDF 46/229 页】IC PIC MCU FLASH 8KX14 28QFN

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Sheet目录3862

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224

8018P–AVR–08/10

ATmega169P

22.7.2

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 22-9.

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 22-9. ADC Power Connections

VCC

GND

100 nF

Ground Plane

(ADC0) PF0

(ADC7) PF7

(ADC1) PF1

(ADC2) PF2

(ADC3) PF3

(ADC4) PF4

(ADC5) PF5

(ADC6) PF6

AREF

GND

AVCC

LCDCAP

PA0

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