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7477 Datasheet(PDF) 163 Page - Renesas Technology Corp |
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7477 Datasheet(HTML) 163 Page - Renesas Technology Corp |
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163 / 354 page  7470/7471/7477/7478 GROUP USER’S MANUAL 1-146 HARDWARE 1.14 A-D converter Fig. 1.14.3 Definition of A-D conversion precision Vn: Analog input voltage when output data changes from “n” to “n + 1” (n = 0 – 254). • 1LSB = V254 – VO (V) → 1LSB at relative precision • 1LSB = VREF (V) → 1LSB at absolute precision 254 256 2 1 LSB 2 3 LSB VREF V254 Vn+1 Vn V1 V0 0 1 n n+1 254 255 Output data Full-scale transition error (VFST) Analog voltage Absolute accuracy Zero transition error (V OT) Differential non-linearity error Non-linearity error Ideal A-D conversion characteristics between 0 and VREF Ideal A-D conversion characteristics between V0 and V254 1LSB at relative accuracy 1LSB at absolute accuracy Actual A-D conversion characteristics |
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