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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega128 датащи(PDF) 239 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 239 Page - ATMEL Corporation |
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239 / 386 page  239 2467S–AVR–07/09 ATmega128 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 2 n-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 115. Offset Error • Gain Error: After adjusting for offset, the gain error is found as the deviation of the last transition (0x3FE to 0x3FF) compared to the ideal transition (at 1.5 LSB below maximum). Ideal value: 0 LSB Figure 116. Gain Error • Integral Non-linearity (INL): After adjusting for offset and gain error, the INL is the maximum deviation of an actual transition compared to an ideal transition for any code. Ideal value: 0 LSB. Output Code VREF Input Voltage Ideal ADC Actual ADC Offset Error Output Code VREF Input Voltage Ideal ADC Actual ADC Gain Error |
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