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7721 Datasheet(PDF) 262 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 262 Page - Renesas Technology Corp |
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262 / 577 page  7721 Group User’s Manual 12–11 A-D CONVERTER Table 12.3.2 Change in successive approximation register and Vref during A-D conversion 12.3 A-D conversion method ± 1 1 n7 0 00 000 0 00 0 000 0 10 0 0 0 0 0 n7 n6 10 0 0 0 0 n7 n6 n5 n4 n3 n2 n1 1 n7 n6 n5 n4 n3 n2 n1 n0 b7 b0 1st comparison result 2nd comparison result Successive approximation register Change of Vref A-D converter halt 1st comparison 2nd comparison 3rd comparison 8th comparison Conversion complete – 2 VREF 512 VREF : 2 VREF ± 2 VREF 4 VREF – 512 VREF ± 2 VREF 4 VREF 8 VREF – 512 VREF ± ± 2 VREF 4 VREF 8 VREF ± ...... ± VREF 256 – 512 VREF [V] [V] [V] [V] [V] 4 VREF •n7=1 4 VREF •n7=0 + – 8 VREF 8 VREF •n6=1 •n6=0 + – : : : : : Fig. 12.3.1 Ideal A-D conversion characteristics 0016 0116 0216 0316 FE16 FF16 Analog input voltage VREF 256 !1 VREF 256 !2 VREF 256 !3 !253 VREF 256 VREF 256 !254 VREF 256 !255 VREF VREF 256 !0.5 ldeal A-D conversion characteristics 0 A-D conversion result FD16 |
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