DAC8222

–13–

REV. C

Figure 27. Single Supply Operation (Voltage Switching Mode)

Figure 28. Digitally-Programmable Window Detector (Upper/Lower Limit Detector)

BASIC APPLICATIONS

PROGRAMMING WINDOW DETECTOR

Figure 28 shows the DAC8222 used in a programmable window

detector configuration. The required upper and lower limits for

the test are loaded into

DAC A and DAC B. If a signal at the

test input is not within the programmed limits, the output will

indicate a logic zero.

MICROPROCESSOR INTERFACE CIRCUITS

The DAC8222’s versatile loading structure greatly simplifies in-

terfacing to 16-bit bus systems; it also reduces the number of

“glue” logic components. Data loading into its 12-bit wide data

input is achieved by use of only two control signals,

WR and

LDAC. DAC selection is controlled with a single DAC A/DAC B

line.

Figures 29 and 30 show how easily the DAC8222 interfaces

with the 8086 and 68000 16-bit microprocessors.