National Instruments NI 6225 User Manual

© National Instruments Corporation 4-1 M Series User Manual
4
Analog Input
Figure 4-1 shows the analog input circuitry of M Series devices.
Figure 4-1. M Series Analog Input Circuitry
The main blocks featured in the M Series analog input circuitry are as
follows:
• 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 depends on the analog input ground-reference settings,
described in the Analog Input Ground-Reference Settings section. Also
refer to Appendix A, Device-Specific Information, for device I/O
connector 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.
• Ground-Reference Settings—The analog input ground-reference
settings circuitry selects between differential, referenced single-ended,
and non-referenced single-ended input modes. Each AI channel can
use a different mode.
• Instrumentation Amplifier (NI-PGIA)—The NI programmable gain
instrumentation amplifier (NI-PGIA) is a measurement and instrument
class amplifier that minimizes settling times for all input ranges. The
DIFF, RSE,
or NRSE
I/O Connector
AI <0..n>
Mux
AI SENSE
AI GND
NI-PGIA
AI Terminal
Configuration
Selection
Input Range
Selection
ADC
AI FIFO
AI Data
AI Lowpass
Filter

National Instruments NI 6225 Specifications

General

Brand	National Instruments
Model	NI 6225
Category	Media Converter
Language	English