National Instruments PCIe-6323, User Manual

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Chapter 4 Analog Input
Analog Input Timing Signals
In order to provide all of the timing functionality described throughout this section, MIO
X Series devices have a flexible timing engine. Figure 4-12 summarizes all of the timing options
provided by the analog input timing engine. Also refer to the
Clock Routing section of Chapter 9,
Digital Routing and Clock Generation .
Figure 4-12. Analog Input Timing Options
MIO X Series devices use AI Sample Clock (ai/SampleClock) and AI Convert Clock
(ai/ConvertClock) to perform interval sampling. As Figure 4-13 shows, AI Sample Clock
controls the sample period, which is determined by the following equation:
1/Sample Period = Sample Rate
Figure 4-13. MIO X Series Interval Sampling
AI Convert Clock controls the Convert Period, which is determined by the following equation:
1/Convert Period = Convert Rate
PFI, RT S I
PXI_ S TAR
An a log Comp a ri s on
Event
20 MHz Time bas e
100 kHz Time bas e
PXI_CLK10
Progr a mm ab le
Clock
Divider
Progr a mm ab le
Clock
Divider
AI Sa mple Clock
Time bas e
AI Convert Clock
Time bas e
PFI, RT S I
PXI_ S TAR
An a log Comp a ri s on Event
Ctr n Intern a l O u tp u t
S W P u l s e
PFI, RT S I
PXI_ S TAR
An a log Comp a ri s on Event
Ctr n Intern a l O u tp u t
AI Convert Clock
AI Sa mple Clock
100 MHz Time bas e
Ch a nnel 0
Ch a nnel 1
Convert Period
Sa mple Period