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Before performing A/D conversions, the JP1 jumper should be set for single-ended or
differential.
The software driver supports both polling and interrupt driven A/D, however, polling
is the simplest way to perform an A/D conversion.
The settling time of multiplexer depends on the impedance of the signal source.
Because the driver does not incorporate the settling time,
the user needs to program a
delay when switching from one channel to another or when changing gains.
Suggested Settling Times
One settling time is suggested for all ranges of the OME-PCI-1002L. The settling time
for the OME-PCI-1002H is based on the analog input range. The table below shows the
suggested settling times for each range.
OME-PCI-1002L Settling Time:
33
µ
seconds for all ranges
OME-PCI-1002H Settling Time
Input Range
Settling Time
±
10V
23
µ
S
±
5V
28
µ
S
±
0.1V
140
µ
S
±
0.01V
1300
µ
S
The software driver provides
a machine independent timer, P1002_Delay()
, for
settling time delay. If the user calls P1002_Delay(), counter 0 will be reserved and can
not be used as a user programmable timer/counter.
The A/D converter requires a trigger signal to start an A/D conversion cycle
. The
OME-PCI-1002 supports three trigger modes,
software, pacer and external trigger
.
39
Summary of Contents for OME-PCI-1002
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