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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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L9678P 데이터시트(PDF) 169 Page - STMicroelectronics |
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L9678P 데이터시트(HTML) 169 Page - STMicroelectronics |
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169 / 215 page  DS11626 Rev 9 169/216 L9678P, L9678P-S System voltage diagnostics 214 applies to the case of a precise reference voltage: the spread of reference voltage causes a proportional error in the conversion output. The reference voltage of the ADC is set to 2.5 V. The conversion time is comprised of several factors: the number of measurements loaded into the queue, the number of samples taken for any measurement, and the various settling times. An example of conversion time calculation for a full ADC request queue is reported in Figure 57. The timings reported in Figure 57 are nominal ones, min/max values can be obtained by considering the internal oscillator frequency variation reported in the DC characteristics section. Figure 57. ADC conversion time GAPGPS01655 IQ Post ADC IQ IQ ADC Pre- DIAGCTRL_ A S * T_SC DIAGCTRL_B S * T_SC DIAGCTRL_C S*T_SC DIAGCTRL_D S*T_SC Post- ADC = Final ADC Settling Time = 3.44 μs IQ = Intra- Queue Settling Time = 3.5 μs T_ SC = Single Sample Conversion Time = 2.25 μs S = # of Samples (default = 4 for voltage only measurements) Pre- AD C = Initial ADC Settling Time = 4.81 μs |
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