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MB95430 Datasheet(PDF) 47 Page - fujitsu semiconductor |
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MB95430 Datasheet(HTML) 47 Page - fujitsu semiconductor |
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47 / 56 page  MB95430H Series DS07–12xxx–1E 47 (3) Definitions of A/D Converter Terms • Resolution It indicates the level of analog variation that can be distinguished by the A/D converter. When the number of bits is 10, analog voltage can be divided into 210 = 1024. • Linearity error (unit: LSB) It indicates how much an actual conversion value deviates from the straight line connecting the zero transition point (“00 0000 0000” ← → “00 0000 0001”) of a device to the full-scale transition point (“11 1111 1111” ← → “11 1111 1110”) of the same device. • Differential linear error (unit: LSB) It indicates how much the input voltage required to change the output code by 1 LSB deviates from an ideal value. • Total error (unit: LSB) It indicates the difference between an actual value and a theoretical value. The error can be caused by a zero transition error, a full-scale transition errors, a linearity error, a quantum error, or noise. (Continued) VFST Ideal I/O characteristics 001H 002H 003H 004H 3FDH 3FEH 3FFH 2 LSB VOT 1 LSB 0.5 LSB Total error Analog input Analog input 001H 002H 003H 004H 3FDH 3FEH 3FFH Actual conversion characteristic Ideal characteristic Actual conversion characteristic N VNT : A/D converter digital output value : Voltage at which the digital output transits from (N - 1)H to NH {1 LSB × (N-1) + 0.5 LSB} VNT Total error of digital output N VNT - {1 LSB × (N - 1) + 0.5 LSB} 1 LSB [LSB] = VCC - VSS 1024 (V) 1 LSB = VSS VCC VSS VCC |
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