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XWM8181CDW Datasheet(PDF) 10 Page - Wolfson Microelectronics plc |
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XWM8181CDW Datasheet(HTML) 10 Page - Wolfson Microelectronics plc |
10 / 14 page WM8181 Advanced Information WOLFSON MICROELECTRONICS LTD AI Rev 3.0 January 2000 10 SYSTEM ASIC CIS SENSOR V OUT WM8181 VSMP DOUT MCLK VINP VINM CLAMP VREFIN V R T V R B EXACT CIRCUITRY MAY VARY DEPENDING ON SENSOR USED BLACK REFERENCE LEVEL SET VOLTAGE TO MATCH V PP FROM SENSOR OR TIE TO AVDD TO SET FULL-SCALE INPUT TO 1.5V Figure 6 d.c. Coupled Positive Video Some of the newer CIS devices have a reference voltage that corresponds closely to the black level. In most cases this reference voltage cannot be applied directly to the VINM pin because the black video output can go below this value and will be outside the range of the ADC. To overcome this, VINM should be driven from a voltage that is slightly more negative than the CIS reference voltage. This is shown in Figure 7. The input current to VINM is small but care should be taken to ensure that R2 and R3 do not load the CIS reference circuit. SYSTEM ASIC CIS SENSOR V OUT WM8181 VSMP DOUT MCLK VINP VINM CLAMP V REF VREFIN V R T V R B EXACT CIRCUITRY MAY VARY DEPENDING ON SENSOR USED SET VOLTAGE TO MATCH V PP FROM SENSOR OR TIE TO AVDD TO SET FULL-SCALE INPUT TO 1.5V Figure 7 CIS with Reference Voltage |
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