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AD7391AR Datasheet(PDF) 11 Page - Analog Devices

Part # AD7391AR
Description  3 Volt Serial-Input Micropower 10-Bit & 12-Bit DACs
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7391AR Datasheet(HTML) 11 Page - Analog Devices

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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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