Caractéristiques:
- Software-selectable decimation factor (1 to 100,000) for Fast External Clock and 10 MHz Reference Clock
- 50 Ohm input impedance for AC signals
- 10 kiloOhm input impedance for DC
ATST146: mise à niv.: horloge externe
Modification qui permet la synchronisation à une horloge externe via le connecteur ECLK sur la carte numériseur ATST146
There are three supported types of External Clock
- Fast External Clock
A new sample is taken by the on-board ADCs for each rising (or falling) edge of this External Clock signal. Fast External Clock frequency must always be higher than 1 MHz and lower than 125 MHz in order to satisfy the clocking requirements of the ADC chips being used. - Slow External Clock
This type of clock should be used when the clock frequency is either too slow or is a burst-type clock. In this mode, the ATST146 ADCs are run at a preset internal clock frequency. The user-supplied Slow External Clock signal is then monitored for low-to-high transitions. Each time there is such a transition, a new sample is stored into the onboard memory. - 10 MHz Reference Clock
It is possible to generate the sampling clock based on an external 10 MHz reference input. ATST146 uses an advanced clock generator circuit consisting of a VCO and PLL to generate the sampling clock.