NI 9683 User Guide and Specifications
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© National Instruments
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11
Sinking Digital Output
The NI 9683 provides connections for 24 sinking digital output channels.
Each channel has a sinking DO pin to which you can connect a digital input device. Sinking DO
pins have dedicated current return pins, GND, which are referenced to the ground of the board.
Figure 14.
Connecting a Digital Device to a Sinking DO Channel
The NI 9683 has current sinking digital outputs, meaning that the output pin is driven to ground
(GND) when the channel is ON.
Make sure the devices you connect to the NI 9683 are compatible with the output specifications.
Refer to the
section for information about output voltages.
Increasing Current Drive
Each channel has a continuous output current of 20 mA. If you want to increase the output
current to a device, you can connect any number of channels together in parallel. For example,
if you want to drive 80 mA of current, connect DO<0..3> in parallel as shown in Figure 15. You
must turn all parallel channels on and off simultaneously so that the current on any single
channel cannot exceed the 20 mA rating.
Figure 15.
Increasing the Current to a Device Connected to the NI 9683
NI 96
83
S
inking DO
Device
Vcc
NI 96
83
S
inking DO
3
S
inking DO1
S
inking DO0
S
inking DO2
8
0 mA
+
_
GND
20 mA
20 mA
20 mA
20 mA
Extern
a
l
Power
Su
pply
Device
