AD7391AR(Rev0) Ver la hoja de datos (PDF) - Analog Devices

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AD7391AR
(Rev.:Rev0)

+3 Volt Serial-Input Micropower 10-Bit & 12-Bit DACs

Analog Devices 

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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