National Instruments 6008 - Manual (Page 16)

NI USB-6008/6009 User Guide and Specifications 16 ni.com
Analog Output
The NI USB-6008/6009 has two independent AO channels that can
generate outputs from 0–5 V. All updates of AO lines are software-timed.
Analog Output Circuitry
Figure 11 illustrates the analog output circuitry for the NI USB-6008/6009.
Figure 11. Analog Output Circuitry
DACs
Digital-to-analog converts (DACs) convert digital codes to analog
voltages.
Connecting Analog Output Loads
To connect loads to the NI USB-6008/6009, connect the positive lead of the
load to the AO terminal, and connect the ground of the load to a GND
terminal.
Figure 12. Connecting a Load
REF(+) REF(–)
12-Bit
DAC
Output
Buffer
50 Ω
AO
+5 V
GND
AI
Voltage
Source
NI USB-6008/6009
GND