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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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7733 датащи(PDF) 281 Page - Renesas Technology Corp |
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7733 датащи(HTML) 281 Page - Renesas Technology Corp |
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281 / 940 page  A-D CONVERTER 7733 Group User’s Manual 9–16 07 05 06 03 00 02 Analog input voltage (mV) 02 01 00 04 02 01 00 01 08 09 10 30 17.5 37.5 q8-bit A-D converter (When VREF = 5.12 V) Output code (A-D conversion result) qM37733MHBXXXFP’s A-D converter with ideal characteristics (When VREF = 5.12 V) Output code (A-D conversion result) 8-bit resolution 10-bit resolution (g) Analog input voltage (mV) 8-bit resolution 10-bit resolution g: Difference from output code change point VREF: Reference voltage (g) 9.4.3 Comparison voltage when resolution = 8 bits When 8-bit resolution is selected in the M37733MHBXXXFP, the high-order 8 bits of the 10-bit successive approximation register is the conversion result. Accordingly, when compared with the 8-bit A-D converter, the comparison reference voltage is different by 3VREF/2048 (refer to the underlined portions in the Table 9.4.1). The difference of the output code change point is generated as shown in Figure 9.4.3. M37733MHBXXXFP (When resolution = 8 bits) 8-bit A-D converter Comparison reference voltage Vref VREFV1/28 ! nV2 – VREF/210 ! 0.5 VREF/28 ! n – VREF/28 ! 0.5 VREFV1: Reference voltage nV2: Contents of successive approximation register Table 9.4.1 Compare reference voltage 9.4 Absolute accuracy and Differential non-linearity error Fig. 9.4.3 Difference of output code change point |
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