Chapter 4 Theory Of Operation; Functional Overview; Figure 4-1. Daqcard-500 Block Diagram - National Instruments Corporation DAQCard-500 User Manual

Chapter 4
Theory of Operation
This chapter includes an overview of the DAQCard-500 and explains the operation of each
functional unit making up the DAQCard-500.

Functional Overview

The block diagram in Figure 4-1 shows a functional overview of the DAQCard-500.
PCMCIA
I/O
Channel
Interface
Interrupt
Interface
+5 V
© National Instruments Corporation
12-Bit
16-Word
Sampling
FIFO
ADC
OUT0
A/D Timing
MSM82C54
From A/D FIFO
Digital
I/O
+12 V
DC-DC
Converter
-12 V

Figure 4-1. DAQCard-500 Block Diagram

4-1
Input
Mux
8-Channel
Buffer
Single-
Ended
EXTCONV*
1 MHz
GATE2
CLK <1..2>
OUT <1..2>
4
4
To Analog Circuit
+5.1 V -5.1 V
1 A Resettable Fuse
8
Scanning Counter
To Analog Circuit
+5 V
DAQCard-500 User Manual