Theory Of Operation; Functional Overview; Figure 4-1. Daqcard-1200 Block Diagram - National Instruments DAQCard-1200 User Manual

Theory of Operation

Functional Overview

PCMCIA
I/O
Channel
Interface
Interrupt
Interface
+5 V
DC-DC
Converter
© 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.
data
8
8
Decode
Circuitry,
Core
Control
Logic
Signals
82C53
Ctr/Timer
Group A
+12 V
1MHz
Timebase
–12 V
20 MHz
Oscillator

Figure 4-1. DAQCard-1200 Block Diagram

2K 12-Bit
FIFO A/D
3
8
82C55A
Digital
Interface
8
2 MHz
Time
Timebase
Divider
4-1
4
Dither
Pgm Input
Gain Mux
4
Calibration
4
12-Bit
8
D/A
1
12-Bit
8
D/A
1
82C53
Ctr/Timer
Group B
DAQCard-1200 User Manual
8