D/A External Timebase Signal - Measurement Computing PCI-DAS6013 User Manual

PCI-DAS6013 and PCI-DAS6014 User's Guide
Rising Edge Polarity
Falling Edge Polarity

D/A EXTERNAL TIMEBASE 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 TIMEBASE signal is 20 MHz. The
minimum pulse width is 23 ns high or low. There is no minimum frequency
specification.
Figure 4-19
signal.
Figure 4-17. D/A CONVERT Input Signal Timing
Figure 4-18. D/A CONVERT Output Signal Timing
shows the timing requirements for the D/A EXTERNAL TIMEBASE
t =50 ns minimum
p
t
t =23 ns minimum
w
Figure 4-19. D/A EXTERNAL TIMEBASE Signal Timing
t
w
t = 37.5 ns minimum
w
t
w
t = 225 ns
w
t
p
t
w w
4-12
Functional Details