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USB-9201/9221 Circuitry
Specifications
Input Characteristics
USB-9201/9221 User Guide and Specifications
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Refer to your software documentation, accessible from Start»
All Programs»National Instruments»NI-DAQ, for information about
different methods of reading USB-9201/9221 data.
The USB-9201/9221 channels are isolated, and the device protects each
channel from overvoltages. The input signals are scanned, buffered,
conditioned, and then sampled by a single 12-bit ADC. For more
information about overvoltage protection, refer to the Specifications
section.
AI 0
Overvoltage
Protection
AI 7
COM
Figure 10. Input Circuitry for One Channel
The following specifications are typical for the range 0 to 60 °C
unless otherwise noted. All voltages are relative to COM unless otherwise
noted.
Number of channels................................8
ADC resolution.......................................12 bits
Type of ADC ..........................................Successive approximation
Mux
Buffer
register (SAR)
10
Isolated
ADC
USB-9201/9221
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