Chapter 4 Analog Input
© National Instruments 4-41 X Series User Manual
Analog Input on Simultaneous MIO X Series Devices
Figure 4-25 shows the analog input circuitry of the Simultaneous MIO
X Series devices.
Figure 4-25. Simultaneous MIO X Series Analog Input Circuitry
On Simultaneous MIO X Series devices, each channel uses its own
instrumentation amplifier, FIFO, multiplexer (mux), and A/D converter
(ADC) to achieve simultaneous data acquisition. The main blocks featured
in the Simultaneous MIO X Series device analog input circuitry are as
follows:
• I/O Connector—You can connect analog input signals to the
Simultaneous MIO X Series device through the I/O connector. Refer to
Appendix A, Device-Specific Information, for device I/O connector
pinouts.
• Instrumentation Amplifier (NI-PGIA)—The NI programmable gain
instrumentation amplifier (NI-PGIA) can amplify or attenuate an AI
signal to ensure that you get the maximum resolution of the ADC. The
NI-PGIA also allows you to select the input range.
• ADC—The analog-to-digital converter (ADC) digitizes the AI signal
by converting the analog voltage into a digital number.
• Analog Input Timing Signals—For information about the analog
input timing signals available on Simultaneous MIO X Series devices,
refer to the Analog Input Timing Signals section.
NI-PGIA
+
–
AI Data
Analog Input Timing Signals
ADC
AI FIFO
+
–
ADC
I/O Connector
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