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DEWE-ORION-1616-10x
sample clock
counter source
real counter value
ORION counter
standard counter
For low frequency input signals the frequency also can be obtained by measure the period time and take
its inverse without more inaccuracy.
3.2.2 Miscellaneous counter functions
3.2.2.1 Filters
Each counter input has a digital filter, which can be set to various gate times. If the gate time is set to “Off”,
no filter is on the input signal.
The filter circuit samples the input signal on each rising edge of the internal time base. If the input signal
maintains his state for at least the gate time, the new state is propagated. As an effect the signal transition is
shifted by the gate time.
Figure 24 demonstrates the function of the filter.
Internal Time Base
(80MHz)
Filter Input Signal
Filter Output Signal
Gate Time
Gate Time
Figure 24: Filters
The intent of the filter is to eliminate unstable states, e.g. glitches, chatter, …, which may appear on the input
signal, as shown in Figure 25.
Summary of Contents for DEWE-ORION-1616-10 Series
Page 56: ...C2 Notes...
