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Chapter 4
Theory of Operation
GATEB2
CLKB2
OUTB2
GATEB1
CLKB1
OUTB1
OUTB0
GATEB0
EXTCONV*
EXTTRIG
EXTUPDATE*
DAQCard-1200 User Manual
GATEB2
CLKB2
General
Purpose
Counter
OUTB2
GATEB1
CLKB1
Scan
MUX
Interval/
General
Purpose
Counter
CLKA0
OUTB1
OUTB0
GATEB0
Timebase
Extension/
General
Purpose
Counter
2 MHz
CLKB0
Source
82C53 Counter/Timer
Group B
OUTB1
A/D Conversion Logic
D/A Conversion Logic
OUTB0
1 MHz Source
MUX
GATEB1
CLKB1
OUTB1
GATEB1
CLKA2
GATEA2
+5 V
CLKA2
GATEA2
OUTA2
82C53 Counter/Timer
Figure 4-3. Timing Circuitry
4-4
CTR RD
CTR WRT
Data
8
Sample
Interval
Counter
Sample
Counter
CLKA2
GATEA2
DAC
DAC
Timing
Timing
OUTA2
Group A
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