NI USB-6000 - Analog Input

10 | ni.com | NI USB-6000 User Guide
Analog Input
The NI USB-6000 has eight ±10 V fixed-range analog input channels for single-ended analog
input measurements.
Figure 5 shows the analog input circuitry of the NI USB-6000.
Figure 5. NI USB-6000 Analog Input Circuitry
The main blocks featured in the analog input circuitry are as follows:
• MUX—The multiplexer (MUX) routes one AI channel at a time to the amplifier (AMP).
• AMP—The amplifier (AMP) buffers analog input signal, before the signal is sampled by
the analog-to-digital converter (ADC).
• ADC—The analog-to-digital converter (ADC) digitizes the AI signal by converting the
analog voltage into digital code.
• AI FIFO—The NI USB-6000 can perform both single and multiple analog-to-digital
conversions of a fixed or infinite number of samples. A first-in-first-out (FIFO) buffer
holds data during AI acquisitions to ensure that no data is lost.
PFI 1 D GND Input PFI 1—A digital trigger input. Refer to the
Using PFI 1 to Trigger an Analog Input
Acquisition section for more information.
AI <0..7> AI GND Input Analog Input Channels 0 to 7—Analog
input voltage channels. Refer to the Analog
Input section for more information.
Table 4. Signal Descriptions (Continued)
Signal
Name
Reference Direction Description
AI 7
AMP
AI FIFO
ADC
MUX
AI 0
1 MΩ
1 MΩ