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Manual Number: 00650-134-4
Page 3
Chapter 2: Functional Description
The AOB8/12 and AOB16/12 are full-size cards that can be installed in any long I/O slot of PC-AT
class computers. They contain either 8 or 16 double-buffered digital-to-analog converters (DAC)
and provide 8 or 16 independent analog output channels of 12-bit resolution. Each analog output
channel can be configured for ranges of:
0V to +2.5V
0V to +5V
0V to +10V
-2.5V to +2.5V
-5V to +5V
-10V to +10V
The analog output channels have a double-buffered input for single-step update and each is ad-
dressed at its own I/O location. Type AD7237 double-buffered, dual, DAC chips are used. Data are
transferred into outer registers a byte at a time (eight LSB’s then eight MSB’s) and then transferred
into inner registers a word at a time. The analog outputs can be updated either independently or
simultaneously.
In order to prevent excessive outputs at power-up, the AOBx/12 contain automatic circuits that set
D/A outputs to less than 15% of span at system power-on. Upon power-up, the DAC reference
voltage is set to a low voltage and the card is set in the Simultaneous Update mode. After all DAC’s
have been loaded with the desired values, a software command can be used to switch the reference
voltage ON at its nominal value. Similarly, a software command can be used at any time to set the
reference voltage to zero causing all DAC outputs to be zero volts.
Software provided with the card includes a unique program called FINDBASE that will help you to
select an I/O bus address for this card that will not conflict with other resources installed in your
computer. Software provided also includes setup and calibration programs and sample programs.
The setup and calibration program provides pictorial representation and menu selection on the com-
puter monitor. For setup, of course, it is not necessary that the card be plugged into the computer.
The Address Selection and Option Selection sections of this manual provide amplifying information
about switch settings.
Summary of Contents for AOB16/12
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