National Instruments 6008 用户手册

The NI USB-6008/6009 creates an external reference and supplies a power 
source. All voltages are relative to COM unless otherwise noted.

+2.5 External References

The NI USB-6008/6009 creates a high-purity reference voltage supply for 
the ADC using a multi-state regulator, amplifier, and filter circuit. The 
resulting 

+2.5 V reference voltage can be used as a signal for self test. 

+5 V Power Source

The NI USB-6008/6009 supplies a 5 V, 200 mA output. This source can be 
used to power external components. 

While the device is in USB suspend, the output is disabled.

The following specifications are typical at 25 °C, unless otherwise noted.

Converter type ........................................Successive approximation

Analog inputs..........................................8 single-ended, 4 differential, 

software selectable

Input resolution

NI USB-6008...................................12 bits differential,

11 bits single-ended

NI USB-6009...................................14 bits differential,

13 bits single-ended

Max sampling rate

1

NI USB-6008...................................10 kS/s

NI USB-6009...................................48 kS/s

AI FIFO ..................................................512 bytes

Timing resolution ...................................41.67 ns (24 MHz timebase)

1   

System dependent.