PCI-DAS6052 User's Guide
Functional Details
SSH signal
The SSH signal can be used 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.
shows the timing for the SSH signal.
Figure 4-10
Figure 4-10. SSH Signal Timing
Start Pulse
t
off
= 10 ns minimum
CONVERT
SSH
t
off
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 convert pulses must be separated by a
minimum of 5
µ
s to remain within the 200 kS/s conversion rate specification.
Refer to
(page 4-6) and
(page 4-7) for the relationship of
A/D CONVERT to the DAQ sequence.
and
show the input and
output pulse width requirements for the A/D CONVERT signal.
Figure 4-3
Figure 4-6
Figure 4-11
Figure 4-12
4-9
