D/A External Time Base Signal; General-Purpose Counter Signal Timing - Measurement Computing PCI-DAS6031 User Manual

PCI-DAS6031 & PCI-DAS6033 User's Guide
Figure 4-26 and Figure 4-27
Rising Edge Polarity
Falling Edge Polarity

D/A EXTERNAL TIME BASE signal

The D/A EXTERNAL TIME BASE signal can serve as the source for the on-board DAC pacer circuit rather
than using the internal time base. Any AUXIN pin can be set programmatically as the source for this signal. The
polarity is programmable.
The maximum frequency for the D/A EXTERNAL TIME BASE signal is 20 MHz. The minimum pulse width
is 23 ns high or low. There is no minimum frequency specification.
Figure 4-28 shows the timing requirements for the D/A EXTERNAL TIME BASE signal.

General-purpose counter signal timing

The general-purpose counter signals are:
! CTR1 CLK
! CTR1 GATE
! CTR1 OUT
! CTR2 CLK
! CTR2 GATE
! CTR2 OUT
show the input and output timing requirements for the D/A CONVERT signal.
Figure 4-26. D/A CONVERT input signal timing
t
w
t = 225 ns
w
Figure 4-27. D/A CONVERT output signal timing
t =50 ns minimum
p
t
p
t t
w w
t =23 ns minimum
w
Figure 4-28. D/A EXTERNAL TIME BASE signal timing
4-15
t
w
t = 37.5 ns minimum
w
Functional Details