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Chapter 1
Introducing the PC-CARD-DAS16/16AO
Overview: PC-CARD-DAS16/16AO features
The PC-CARD-DAS16/16AO is a data acquisition and control board for IBM PC compatible computers with
PCMCIA type II slots. The PC-CARD-DAS16/16AO provides 16 single-ended or 8 differential analog inputs,
16-bit A/D resolution, two analog outputs, four digital I/O lines, and three 16-bit down counters.
The analog input range is fully programmable in one of four bipolar ranges. An on-board pacer clock, or an
external pacer input, or software polling can trigger A/D conversions. Transfers are via software polling,
interrupt service or REP-INSW. A 4096-word FIFO buffer provides buffering between the A/D circuit and the
PCMCIA bus.
The PC-CARD-DAS16/16AO provides two single-ended 16-bit analog voltage outputs. The analog output
range is ±10 V.
The four digital I/O bits are available on one 4-bit port. The digital channels are software configurable as four
inputs or four outputs, and allow you to sense and control discrete events.
All signals pass through a 50-pin high-density connector. The board is completely plug-and-play, with no
switches or jumpers to set.
PC-CARD-DAS16/16AO block diagram
PC-CARD-DAS16/16AO functions are illustrated in the block diagram shown here.
Controller FPGA
Host Bus Adaptor
Counter/Pacer
Counter 1, 3 Out
10 MHz
Oscillator
2
Pacer Control
/EXT TRIG
Digital I/O
4-bits
8 channel
Analog MUX
Single-ended or
differential select
switching
8 channel
Analog MUX
Programmable-Gain
Amplifier
Precision
Voltage
Reference
ADC
16-bit
5 µS
A/D
Pacer
A
ttribute Memory
Control
/Clock
FIFO Buffer 4K x 8
HI_BYTE
FIFO Buffer
LOW_BYTE
4K x 8
DAC
16-bit
V
OUT 0
DAC
16-bit
V
OUT 1
VREF
Control, IREQ
Data Bus
Address Bus
Figure 1. PC-CARD-DAS16/16AO functional block diagram
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