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Chapter 4 Theory of Operation
NI PXI-4224 User Manual 4-2 ni.com
Figure 4-1. Block Diagram of NI PXI-4224
NI-PGA
Input
Protection
AI0
Input
Protection
AI1
Input
Protection
AI2
Input
Protection
AI3
Input
Protection
AI4
Input
Protection
AI5
Input
Protection
AI6
Input
Protection
AI7
PGA
Post
Filter
ISO
Amp
PGA
Post
Filter
ISO
Amp
PGA
Post
Filter
ISO
Amp
PGA
Post
Filter
ISO
Amp
PGA
Post
Filter
ISO
Amp
PGA
Post
Filter
ISO
Amp
PGA
Post
Filter
ISO
Amp
PGA
Post
Filter
ISO
Amp
Opto
Isolation
Opto
Isolation
Opto
Isolation
Opto
Isolation
Opto
Isolation
Opto
Isolation
Opto
Isolation
Opto
Isolation
Trigger
Interface
Analog Input
Timing/Control
DMA/
Interrupt
Request
Bus
Interface
DAQ-STC
Digital
I/O
RTSI Bus
Interface
AI Control
IRQ
DMA
Analog
Input
Control
EEPROM
Control
DMA
Interface
Plug
and
Play
DAQ-APE
Bus
Interface
82C55
DIO
Control
DAQ-STC
Bus
Interface
EEPROM
RTSI
PXI Connector
Control
Address/Data
Generic
Bus
Interface
PCI
Bus
Interface
MINI-
MITE
EEPROM
SMB
Signal Cond
References
Configuration
Memory
Analog
Input
MUX
Cal
MUX
Analog
Mode
Multiplexor
A/D
Converter
ADC
FIFO
Calibration DACs
Voltage
Ref
Data
Temp Sensor