Measurement Specialties PC-CARD-DAS16/12AO Manuale Utente
Chapter 1
Introducing the PC-CARD-DAS16/12AO
Overview: PC-CARD-DAS16/12AO features
The PC-CARD-DAS16/12AO is a data acquisition and control board for IBM PC compatible computers with
PCMCIA type II slots. The PC-CARD-DAS16/12AO provides 16 single-ended or 8 differential analog inputs,
12-bit A/D resolution, two analog outputs, four digital I/O lines, and three 16-bit down counters.
PCMCIA type II slots. The PC-CARD-DAS16/12AO provides 16 single-ended or 8 differential analog inputs,
12-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.
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-DAS16/12AO provides two single-ended 12-bit analog voltage outputs. The analog output
range is software selectable for ±10 V or ±5 V. The selected range applies to both channels.
range is software selectable for ±10 V or ±5 V. The selected range applies to both channels.
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.
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.
switches or jumpers to set.
PC-CARD-DAS16/12AO block diagram
PC-CARD-DAS16/12AO functions are illustrated in the block diagram shown here.
Controller FPGA
H
o
s
t B
u
s A
d
a
p
to
r
Counter/Pacer
Counter 1, 3 Out
10 MHz
Oscillator
2
Pacer Control
/EXT TRIG
Digital I/O
4-bits
8 channel
Analog MUX
S
ing
le
-e
n
d
ed
or
di
ff
e
ren
ti
al
s
el
ec
t
sw
it
ch
in
g
8 channel
Analog MUX
Programmable-Gain
Amplifier
Precision
Voltage
Reference
ADC
12-bit
10 µS
10 µS
A/D
Pacer
Attribute Memory
Control
/Clock
FIFO Buffer 4K x 8
HI_BYTE
FIFO Buffer
LOW_BYTE
4K x 8
DAC
12-bit
VOUT 0
DAC
12-bit
VOUT 1
VREF
Control, IREQ
Data Bus
Address Bus
Figure 1. PC-CARD-DAS16/12AO functional block diagram
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