| 摘要 |
PURPOSE: To attain an operation with the limited number of pins and various serial data input formats by dividing the master lock signal of a signal converter having a three wire serial interface. CONSTITUTION: All three functions can be obtained by using a pin 2 of a D/A converter IC20. When it is necessary for a user to report the change of a de- emphasis DEM filter, an inside serial clock SCLC is automatically generated by using the pin 2 as a static DEM control pin DEM. For example, in a system in which serial data SDATA are asynchronous with a master clock MSCLK, when the user necessitates an outside SCLK, the switching of the DEM is automatically unnecessitated by using the pin 2 as the SCLK input. In any case, when it is necessary for the user to operate with an SDATA format except an initialization format, a 8 bit constitution sequence CONFIG is applied to the pin 2. As a result, the maximum flexibility can be obtained with the limited number of pins.
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