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OMB-DAQ-2416-4AO User's Guide Functional Details
21
Analog output terminals (VDAC0 through VDAC3)
The OMB-DAQ-2416-4AO has four 16-bit analog output channels with a ±10 V output range.
Analog outputs can be updated at a maximum rate of 1000 samples per second (S/s).
Digital I/O
Up to eight digital I/O lines are available in each OMB-DAQ-2416-4AO.
Digital input voltage ranges of 0 to +15V are permitted, with thresholds of 0.6 V (low) and 2.6 V (high). Each
DIO channel is an open-drain, which, when used as an output, is capable of sinking up to 150 mA for direct
drive applications. The maximum sink current is 150 mA per 8-channel bank, or if all eight channels are used,
18 mA (maximum) per channel.
Figure 15 represents a typical DIO connection for one channel. The other seven channels are connected in the
same manner.
Figure 15. Digital output connection example
Internal pull-up/pull-down capability
Each of the eight DIO bits on the OMB-DAQ-2416-4AO has a 47 kΩ pull-up/pull-down resistor. The pull-
up/pull-down voltage is common to all of the internal 47 kΩ resistors.
All pins are pulled up to +5V by default. To configure these bits for the 0V pull-down option, open the OMB-
DAQ-2416-4AO case to access the three-pin jumper labeled JP1.
To open the case and set the JP1 jumper, do the following.
1. Turn over the OMB-DAQ-2416-4AO and rest it on its top on a flat, stable surface.
2. Remove the five screws shown in Figure 16 from the bottom of the module.
3. Holding both the top and bottom sections of the module, turn it back over, rest it on the surface, and
carefully remove the top portion of the case.