Analog Input; Input Mode - National Instruments NI 6115/6120 User Manual

Chapter 3 Hardware Overview
CH0+
AI CH0
Mux
CH0–
CH1+
AI CH1
Mux
CH1–
CH2+
AI CH2
Mux
CH2–
CH3+
AI CH3
Mux
CH3–
Calibration
Mux
Trigger
Trigger Level
DACs
PFI / Trigger
Timing
STC Digital I/O (8)
DIO
Digital I/O (8)
FPGA Digital I/O (8)
MUX
DAC0
DAC1

Analog Input

Input Mode

Note The inputs are differential only in the sense that the ground loops are broken.
The negative input is not intended to carry signals of interest; rather it provides a DC
reference point for the positive input, which may be different than ground.
NI 6115/6120 User Manual
+
Anti- CH0
CH0
Aliasing 16-Bit
Amplifier
Filter ADC
–
+
Anti- CH1
CH1
Aliasing 16-Bit
Amplifier
Filter ADC
–
+
Anti- CH2
CH2
Aliasing 16-Bit
Amplifier
Filter ADC
–
+
Anti- CH3
CH3
Aliasing 16-Bit
Amplifier
Filter ADC
–
Analog
2
Trigger
Circuitry
Trigger
Counter/
Timing I/O
Digital I/O
DAC
Data (16)
FIFO
Calibration
DACs
The following sections describe in detail each AI category.
The NI 6115/6120 supports only differential (DIFF) input mode. For more
information about DIFF input, refer to the
Signals section of Chapter 4,
showing the signal paths for DIFF input mode.
16
CH0
Data (16)
Latch
CH1
16
Data (16)
Latch
16 CH2
Data (16)
Latch
ADC
FIFO
16 CH3
Data (16)
Latch
AI Control
IRQ
DMA
Analog Input
DMA/IRQ
Timing/Control
Bus
DAQ - STC
Interface
Analog Output
RTSI Bus
Timing/Control
Interface
AO Control
Data (32)
RTSI Bus
Figure 3-2. NI 6120 Block Diagram
Connecting
3-2
Generic
PCI
Mini
Bus
Bus
MITE
Data (32)
Interface
Interface
Address/Data
EEPROM
Analog
EEPROM
DMA
Input
Control
Interface
Control
DAQ-STC
DIO
Bus FPGA
FIFO
Interface
Analog
I/O
DIO
Output
Bus
Control
Control
Interface
Connecting Analog Input
Signals, which contains diagrams
Control
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