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7906 Datasheet(PDF) 308 Page - Renesas Technology Corp |
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7906 Datasheet(HTML) 308 Page - Renesas Technology Corp |
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308 / 531 page  A-D CONVERTER 7906 Group User’s Manual Rev.2.0 12-13 12.3 A-D conversion method Table 12.3.2 Change of successive approximation register and Vref during A-D conversion (8-bit resolution) Table 12.3.3 Change of successive approximation register and Vref during A-D conversion (10-bit resolution) ± 1 1 n9 0 0 0 000 0 0 0 00 0 000 00 0 10 0 0 0 0 0 0 0 n9 n8 10 0 0 0 0 00 n9 n8 n7 n6 n5 n4 n3 10 0 n9 n8 n7 n6 n5 n4 n3 n2 00 b9 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 completed – 2 VREF 2048 VREF : 2 VREF ± 2 VREF 4 VREF – 2048 VREF ± 2 VREF 4 VREF 8 VREF – 2048 VREF ± ± 2 VREF 4 VREF 8 VREF ± ...... ± VREF 256 – 2048 VREF [V] [V] [V] [V] [V] 4 VREF •n9 = 1 4 VREF •n9 = 0 + – 8 VREF 8 VREF •n8 = 1 •n8 = 0 + – : : : : : 1 1 n9 00000 0000 00 0 0 0 0 0 0 0 10 0 0 0 0 000 n9 n8 1000 00 0 0 n9 n8 n7 n6 n5 n4 n3 n2 n1 1 n9 n8 n7 n6 n5 n4 n3 n2 n1 n0 b9 b0 ± – 2 VREF 2048 VREF 2 VREF ± 2 VREF 4 VREF – 2048 VREF ± 2 VREF 4 VREF 8 VREF – 2048 VREF ± ± 2 VREF 4 VREF 8 VREF ± ...... ± VREF 1024 – 2048 VREF [V] [V] [V] [V] [V] Successive approximation register Change of Vref A-D converter halt 1st comparison 2nd comparison 3rd comparison 10th comparison Conversion completed 1st comparison result 2nd comparison result 4 VREF •n9 = 1 4 VREF •n9 = 0 + – 8 VREF 8 VREF •n8 = 1 •n8 = 0 + – : : : : : : |
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