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4508 Datasheet(PDF) 42 Page - Renesas Technology Corp |
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4508 Datasheet(HTML) 42 Page - Renesas Technology Corp |
42 / 142 page Rev.1.02 2006.12.22 page 42 of 140 REJ03B0148-0102 4508 Group (14) Definition of A/D converter accuracy The A/D conversion accuracy is defined below (refer to Figure 35). • Relative accuracy ➀ Zero transition voltage (V0T) This means an analog input voltage when the actual A/D con- version output data changes from “0” to “1.” ➁ Full-scale transition voltage (VFST) This means an analog input voltage when the actual A/D con- version output data changes from “1023” to ”1022.” ➂ Linearity error This means a deviation from the line between V0T and VFST of a converted value between V0T and VFST. ➃ Differential non-linearity error This means a deviation from the input potential difference re- quired to change a converter value between V0T and VFST by 1 LSB at the relative accuracy. • Absolute accuracy This means a deviation from the ideal characteristics between 0 to VDD of actual A/D conversion characteristics. Fig. 35 Definition of A/D conversion accuracy VFST–V0T 1022 VDD 1024 Vn: Analog input voltage when the output data changes from “n” to “n+1” (n = 0 to 1022) • 1LSB at relative accuracy → (V) • 1LSB at absolute accuracy → (V) VDD V1022 Vn V1 V0 Vn+1 n+1 n 1022 1023 1 0 b a c Output data Differential non-linearity error = Linearity error = [LSB] c a b–a a [LSB] Actual A/D conversion characteristics a: 1LSB by relative accuracy b: Vn+1–Vn c: Difference between ideal Vn and actual Vn Zero transition voltage (V0T) Analog voltage Full-scale transition voltage (VFST) Ideal line of A/D conversion between V0–V1022 |
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