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AD7391AR Datasheet(PDF) 11 Page - Analog Devices |
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AD7391AR Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page AD7390/AD7391 REV. 0 –11– MICROCOMPUTER INTERFACES The AD7390 serial data input provides an easy interface to a va- riety of single-chip microcomputers ( µCs). Many µCs have a built-in serial data capability which can be used for communi- cating with the DAC. In cases where no serial port is provided, or it is being used for some other purpose (such as an RS-232 communications interface), the AD7390/AD7391 can easily be addressed in software. Twelve data bits are required to load a value into the AD7390. If more than 12 bits are transmitted before the load LD input goes high, the extra (i.e., the most-significant) bits are ignored. This feature is valuable because most µCs only transmit data in 8-bit increments. Thus, the µC sends 16 bits to the DAC in- stead of 12 bits. The AD7390 will only respond to the last 12 bits clocked into the SDI input, however, so the serial-data interface is not affected. Ten data bits are required to load a value into the AD7391. If more than 10 bits are transmitted before load LD returns high, the extra bits are ignored. |
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