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Figure 12. Connecting Single-Ended Voltage Signals to the Scanned Analog Inputs
Voltage Source
+
–
+
–
Scanned Analog Inputs Accuracy and Bandwidth
Use signal sources with an output impedance of less than 2 kΩ to ensure specified performance.
Large source impedances add to the input resistor inside the NI 9683, which results in increased
settling time and decreases the accuracy of the measurement. Increased input impedance also
results in a decrease of the -3 dB bandwidth.
Half-Bridge Digital Output
The NI 9683 provides connections for 14 half-bridge digital output channels.
Each channel has an half-bridge DO pin to which you can connect a digital input device. An
external power supply referenced to ground of the board must be connected to V
Figure 13. Connecting a Digital Device to a Half-Bridge DO Channel
NI 9683
The NI 9683 has push-pull half-bridge digital outputs, meaning the NI 9683 can sink or source
current. When the channel is ON, the half-bridge DO pin is driven to the external power supply
minus a voltage drop due to the sourced current. When the channel is turned OFF, the half-bridge
DO pin is driven to ground plus a voltage drop due to the sinked current.
Make sure the devices you connect to the NI 9683 are compatible with the
Note
half-bridge digital output specifications. Use connections that match the output
impedance of the NI 9683 half-bridge outputs. Refer to the
information about output voltages.
10 | ni.com | NI 9683 User Guide and Specifications
Scanned AI0
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.
.
Scanned AI7
GND
V
ext
100 Ω
Half-Bridge DO
GND
MUX
ADC
NI 9683
ext
Device
Specifications
.
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