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MB90347E Datasheet(PDF) 66 Page - Fujitsu Component Limited. |
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MB90347E Datasheet(HTML) 66 Page - Fujitsu Component Limited. |
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66 / 84 page 
MB90340E Series 66 6. Definition of A/D Converter Terms (Continued) Resolution : Analog variation that is recognized by the A/D converter. Non linearity error : The deviation between the actual conversion characteristics and a line that joins the zero-transition line ( “00 0000 0000” ← → “00 0000 0001” ) to the full-scale transition line ( “11 1111 1110” ← → “11 1111 1111” ) . Differential linearity error : Deviation of input voltage, which is required for changing output code by 1 LSB, from an ideal value. Total error : Difference between the actual value and the ideal value. The total error includes zero transition error, full-scale transition error, and linear error. 3FFH 3FEH 3FDH 004H 003H 002H 001H AVRL AVRH VNT 1.5 LSB 0.5 LSB {1 LSB × (N − 1) + 0.5 LSB} Actual conversion characteristics (Actually-measured value) Actual conversion characteristics Ideal characteristics Analog input Total error Total error of digital output “N” = VNT − {1 LSB × (N − 1) + 0.5 LSB} 1 LSB [LSB] 1 LSB (Ideal value) = AVRH − AVRL 1024 [V] VOT (Ideal value) = AVRL + 0.5 LSB [V] VFST (Ideal value) = AVRH − 1.5 LSB [V] VNT : A voltage at which the digital output transitions from (N − 1)H to NH. N : Value of the digital output from the A/D converter |
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