Analog Input; Analog Input Circuitry - National Instruments NI 6238 User Manual

Analog Input

AI <0..7>+
Mux
AI <0..7>–
AI GND

Analog Input Circuitry

© National Instruments Corporation
Figure 4-1 shows the analog input circuitry of NI 6238 and NI 6239
devices.
AI Terminal
Configuration
NI-PGIA
Selection
Input Range
Selection
Figure 4-1. NI 6238/6239 Analog Input Circuitry
I/O Connector
You can connect analog input signals to the M Series device through the I/O
connector. The proper way to connect analog input signals is outlined in the
Connecting Analog Current Input Signals
Appendix A, Device-Specific
pinouts.
MUX
Each M Series device has one analog-to-digital converter (ADC). The
multiplexers (MUX) route one AI channel at a time to the ADC through the
NI-PGIA.
Instrumentation Amplifier (NI-PGIA)
The NI programmable gain instrumentation amplifier (PGIA) is a
measurement and instrument class amplifier that minimizes settling times
Isolation
Barrier
Digital
ADC
Isolators
section. Also refer to
Information, for device I/O connector
4-1
4
AI FIFO
AI Data
NI 6238/6239 User Manual