Ai Convert Clock Timebase Signal - National Instruments NI 6221 User Manual

AI Convert Clock Timebase Signal

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ai/SampleClock
ai/ConvertClock
Channel Measured
• Properly Matched Sample Clock and Convert Clock
Figure 4-21. ai/SampleClock and ai/ConvertClock Properly Matched
It is also possible to use a single external signal to drive both
ai/SampleClock and ai/ConvertClock at the same time. In this mode, each
tick of the external clock will cause a conversion on the ADC. Figure 4-22
shows this timing relationship.
ai/SampleClock
ai/ConvertClock
Channel Measured
• One External Signal Driving Both Clocks
Figure 4-22. Single External Signal Driving ai/SampleClock and ai/ConvertClock
The AI Convert Clock Timebase (ai/ConvertClockTimebase) signal is
divided down to provide on of the possible sources for ai/ConvertClock.
Use one of the following signals as the source of
ai/ConvertClockTimebase:
• ai/SampleClockTimebase
• 20 MHz Timebase
ai/ConvertClockTimebase is not available as an output on the I/O
connector.
0 1 2 3 0
Sample #1
0 1 2 3
Sample #1 Sample #2 Sample #3
Simultaneously
4-35
Chapter 4 Analog Input
1 2 3 0 1 2 3
Sample #2 Sample #3
0 1 2 3 0 1 ...
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