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Theory of Operation
Functional Overview
Input
8
Mux
4
Calibration
4
12-Bit
D/A
1
12-Bit
D/A
1
82C53
Ctr/Timer
Group B
© National Instruments Corporation
This chapter explains the operation of each functional unit of the
DAQCard-1200.
The block diagram in Figure 4-1 shows a functional overview of the
DAQCard-1200.
Dither
Pgm
12-Bit
Gain
A/D
3
8
8
82C55A
Digital
Interface
8
8
2 MHz
Divider
Timebase
Figure 4-1. DAQCard-1200 Block Diagram
1 KS
FIFO
8
Decode
Circuitry,
Core
Logic
82C53
Ctr/Timer
Group A
1 MHz
Timebase
Time
20 MHz
Oscillator
4-1
4
Data
PCMCIA
8
I/O
Channel
Interface
Control
Signals
Interrupt
Interface
+
DC-DC
+5 V
–
Converter
DAQCard-1200 User Manual
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