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Chapter 4 Theory of Operation
SCXI-1503 User Manual 4-2 ni.com
Figure 4-1. Block Diagram of SCXI-1503
AI 15 +
AI 15 –
Calibration
Source
SCXIbus
Interface
CJSENSOR
Front Signal Connector
Rear Signal Connector
32-to-1 Mux
Input Protection
and Lowpass Filter
Switch
Switch
Switch Mux
Inst.
Amp
+
–
AI 0 +
AI 0 –
AI 0 +
AI 0 –
Lowpass
Filter
Buffer Buffer
Inst.
Amp
+
–
Gain 31
Gain 0
Lowpass
Filter
Gain Select
Digital Interface
and Control
Buffer
Buffer
Mux
Calibration EEPROM
Input Select
OUT REF
AI GND
AB 0 +
AB 0 –
SCXIbus Connector
100 µA
IEX 15 –
IEX 15 +
100 µA
IEX 0 –
IEX 0 +