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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TC826 датащи(PDF) 7 Page - Microchip Technology |
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TC826 датащи(HTML) 7 Page - Microchip Technology |
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7 / 18 page  © 2002 Microchip Technology Inc. DS21477B-page 7 TC826 For a constant VIN: EQUATION 3-2: The dual slope converter accuracy is unrelated to the integrating resistor and capacitor values, as long as they are stable during a measurement cycle. An inher- ent benefit is noise immunity. Noise spikes are inte- grated or averaged to zero during the integration periods. Integrating ADCs are immune to the large con- version errors that plague successive approximation converters in high noise environments. Interfering sig- nals with frequency components at multiples of the averaging period will be attenuated (Figure 3-2). The TC826 converter improves the conventional dual slope conversion technique by incorporating an auto- zero phase. This phase eliminates zero scale offset errors and drift. A potentiometer is not required to obtain a zero output for zero input. FIGURE 3-2: NORMAL MODE REJECTION OF DUAL SLOPE CONVERTER VIN =VR TRI TSI T = Measurement Period 30 20 10 0 0.1/T 1/T 10/T Input Frequency |
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