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MB90591GPF Datasheet(PDF) 50 Page - Fujitsu Component Limited. |
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MB90591GPF Datasheet(HTML) 50 Page - Fujitsu Component Limited. |
50 / 60 page MB90590G Series 50 DS07-13704-6E (Continued) 7. Notes on Using A/D Converter Select the output impedance value for the external circuit of analog input according to the following conditions, : • Output impedance values of the external circuit of 15 k Ω or lower are recommended. • When capacitors are connected to external pins, the capacitance of several thousand times the internal capacitor value is recommended to minimized the effect of voltage distribution between the external capacitor and internal capacitor. When the output impedance of the external circuit is too high, the sampling period for analog voltages may not be sufficient (sampling period = 4.00 µs @machine clock of 16 MHz). •Error The smaller the | AVRH − AVRL |, the greater the error would become relatively. Linearity error 3FF 3FE 3FD 004 003 002 001 Analog input AVRL AVRH Analog input AVRL AVRH Actual conversion characteristics VOT (measured value) VFST (measured value) Actual conversion value VNT {1 LSB × (N – 1)+ VOT} Theoretical characteristics Differential linearity error Theoretical characteristics V(N + 1)T (measured value) Actual conversion value VNT (measured value) Actual conversion value Linearity error of digital output N VOT : Voltage at transition of digital output from “000H” to “001H” VFST : Voltage at transition of digital output from “3FEH” to “3FFH” [LSB] VNT – {1 LSB × (N – 1) + VOT} 1 LSB = [V] VFST – VOT 1022 = 1 LSB – 1 LSB [LSB] V(N + 1)T – VNT 1 LSB = Differential linearity error of digital N N + 1 N N – 1 N – 2 (measured value) Comparator Analog input 30 pF Max 3.2 k Ω Max • Equipment of analog input circuit model Note : Listed values must be considered as standards. |
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