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ATtiny48 Datasheet(PDF) 166 Page - ATMEL Corporation |
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ATtiny48 Datasheet(HTML) 166 Page - ATMEL Corporation |
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166 / 266 page  166 8008C–AVR–03/09 ATtiny48/88 Figure 17-8. Analog Input Circuitry Note: The capacitor in the figure depicts the total capacitance, including the sample/hold capacitor and any stray or parasitic capacitance inside the device. The value given is worst case. 17.9 Analog Noise Canceling Techniques Digital circuitry inside and outside the device generates EMI which might affect the accuracy of analog measurements. When 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. • Keep analog tracks well away from high-speed switching digital tracks. • If any port pin is used as a digital output, it mustn’t switch while a conversion is in progress. • The analog supply voltage pin (AV CC) should be connected to the digital supply voltage pin (V CC) via an LC network as shown in Figure 17-9. Figure 17-9. ADC Power Connections ADCn IIH 1..100 k Ohm CS/H= 14 pF VCC/2 IIL PC1 (ADC1) PC0 (ADC0) PA1 (ADC7) GND PC7 AVCC PA0 (ADC6) PB5 VCC |
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