Features: • Output jitter below 1 ps from 12 kHz to 20 MHz• Two Selectable References @ 8 kHz• Alarm Output Detecting Loss of Reference or Loss of Lock• Tri-State-able Outputs• Force Free-Run Function• Automatic Free Run Operation upon loss of both references...
VCT2000A: Features: • Output jitter below 1 ps from 12 kHz to 20 MHz• Two Selectable References @ 8 kHz• Alarm Output Detecting Loss of Reference or Loss of Lock• Tri-State-able Output...
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The VCT2000A is a dual reference input 3.3V clock generator module with an HCMOS output. Reference inputs are selectable by a one-bit select control input.
An alarm output of VCT2000A can be used to detect a problem on the selected reference, such as a loss of lock or a loss of reference. A logic level "1" is indicated from the alarm pin when there is a problem with the selected reference. The unit operates in the free run mode when there is a problem with the selected reference, or when free run is invoked by enabling the forced free run input. Free run accuracy will keep the output to within 20 ppm. The reference will not automatically switch upon loss of reference. Also, all outputs may be tri-stated for external testing purposes with a signal to the Tri-State/Reset input.
The Loss of Reference alarm of VCT2000A detects a missing rising edge within 100 nS of the missing edge. This is usually around 70 nS. The 8kHz output is divided from the on-board low jitter oscillator. Output phase coherence is maintained during reference switching rearrangement, so the output phase will not necessarily be the same as the reference being used. The dimensions of the low jitter module are 1.00" x 1.05" x 0.32" mounted on a FR-4 board with castillations.