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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny25 датащи(PDF) 119 Page - ATMEL Corporation |
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ATtiny25 датащи(HTML) 119 Page - ATMEL Corporation |
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119 / 196 page  119 7598H–AVR–07/09 ATtiny25/45/85 Figure 18-8. Analog Input Circuitry 18.6.2 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: a. 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 digi- tal tracks. b. Use the ADC noise canceler function to reduce induced noise from the CPU. c. If any port pins are used as digital outputs, it is essential that these do not switch while a conversion is in progress. 18.6.3 ADC Accuracy Definitions An n-bit single-ended ADC converts a voltage linearly between GND and V REF in 2 n steps (LSBs). The lowest code is read as 0, and the highest code is read as 2n-1. Several parameters describe the deviation from the ideal behavior: • Offset: The deviation of the first transition (0x000 to 0x001) compared to the ideal transition (at 0.5 LSB). Ideal value: 0 LSB. Figure 18-9. Offset Error ADCn IIH 1..100 kohm CS/H= 14 pF VCC/2 IIL Output Code VREF Input Voltage Ideal ADC Actual ADC Offset Error |
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