907-0601-00 Rev. C Model 907 Video/Data Multiplexer – User’s Guide
Focal Technologies Corp. Page 5-8
5.6 907-DAC (8-Channel DAC Card)
The 907-DAC expansion card shown in Figure 5-6 is a digital-to-analog converter card used in conjunction
with the 907-ADC. The 907-DAC takes 8-bit digitized data streams (12-bit support can be provided through
factory configuration) and converts the samples into analog waveforms. Switch SW1 is used to select the
number of active channels, i.e. the inputs can be configured such that all 8 channels are active (8 x 8-bit) or
channels 1 through 6 are active (6 x 12-bit). The card provides a maximum of 1 VDC differential output
voltage, with a typical common mode voltage of 2.5 VDC, and handles signals from DC up to a maximum of
50 kHz bandwidth.
Figure 5-6: 907-DAC Expansion Card
Dual outputs are provided by connectors J1 - J4 so that channels may be monitored live while also connected
to controllers or logging equipment.
Switch SW1 is also used to set the backplane data port used by the 907-DAC card. Ports 1, 3 or 5 are
available. The default setting is data port #1.
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