National Instruments DAQ Series - Page 40

Chapter 4 Theory of Operation
DAQCard-700 User Manual 4-2 ni.com
Figure 4-1. DAQCard-700 Block Diagram
The following are the major components making up the DAQCard-700:
• PCMCIA I/O channel interface circuitry
• AI circuitry
Buffer
PCMCIA I/O Channel
I/O Connector
12-Bit
Sampling
ADC
Instrumentation
Amplifier
Input
Mux1 Dual
(8-Channel
Single-
Ended)
Input
Mux2
(4-Channel)
PCMCIA
I/O Channel
Interface
MSM82C54
Scanning
Counter
Interrupt
Interface
OUT0EXTCONV*
A/D Timing
Digital
I/O
DC-DC
Converter
512-Word
FIFO
GATE<0..2>
CLK<1..2>
OUT<0..2>
3
3
2
From A/D FIFO
8
8
To Analog CircuitTo Analog Circuit
1 A Resettable Fuse
+5 V+5 V
+12 V
+12 V
+
–
8
8