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PCI-DAS6031 & PCI-DAS6033 User's Guide
SSH signal
You can use the SSH signal as a control signal for external sample/hold circuits. The SSH signal is a
programmable polarity pulse that is asserted throughout a channel scan. The state of this signal changes after the
start of the last conversion in the scan. The SSH signal may be routed via software selection to any of the
AUXOUT pins.
Figure 4-10
A/D CONVERT signal
The A/D CONVERT signal indicates the start of an A/D conversion. It is available through software selection
as an input to any of the AUXIN pins (defaulting to AUXIN0) or the DAQ-Sync DS A/D CONVERT input and
as an output to any of the AUXOUT pins.
When used as an input, the polarity is software selectable. The A/D CONVERT signal starts an acquisition on
the selected edge. The selected edge (either rising of falling) of the convert pulses must be separated by a
minimum of 10 µs to remain within the 100 kS/s conversion rate specification.
Refer to
Figure 4-3
and
and
Figure 4-12
show the input and output pulse width requirements for the A/D CONVERT signal.
Rising Edge Polarity
Falling Edge Polarity
The A/D CONVERT signal is generated by the on-board pacer circuit unless the external clock option is in use.
This signal may be gated by hardware (A/D PACER GATE) or software.
shows the timing for the SSH signal.
Start Pulse
CONVERT
SSH
t
off
Figure 4-10. SSH signal timing
Figure 4-6
for the relationship of A/D CONVERT to the DAQ sequence. Fi
Figure 4-11. A/D CONVERT signal input timing requirement
Figure 4-12. A/D CONVERT signal output timing requirement
= 10 ns minimum
t
w
t
= 37.5 ns minimum
w
t
w
t
= 50 ns
w
4-7
Functional Details
t
off
gure 4-11
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