AD7391ARU 查看數據表（PDF） - Analog Devices
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AD7391ARU Datasheet PDF : 12 Pages
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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.
AD7390/AD7391
REV. 0
–11–
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