- Screened external clocking from 1.8 GHz down to 75 MHz
- Allows variable frequency external clock signals to be used
- Allows locking to an external 10 MHz reference
- Supports clock signals from +/- 400mV to +/- 1.6V
- 50 Ohm input impedance
ATS9360: m-à-n: horloge externe filtrée
This optional upgrade allows ATS9360 to perform analog to digital conversion based on an external clock signal. This upgrade contains all the features of ATS9360-005 external clock upgrade, but also guarantees that Fast External clock will work down to 75 MHz frequency.
Two software selectable modes of external clocking are supported: user supplies a 10 MHz reference clock and the on-board VCO locks to it; or Fast External Clock whereby ATS9360 takes a new sample for each rising edge of the user-supplied clock. Fast External Clock frequency must remain in the specified range of 75 MHz to 1.8 GHz.
What is Screened External Clock?
The ADCs used on ATS9360 have a “minimum clock frequency” specification of 300 MHz, i.e. if the external clock signal is lower than 300 MHz, the ADC may not be able to make proper measurement. Typical problem is that user will see glitches in the output data. Many customer applications need the ATS9360 to work with external clock frequencies lower than 300 MHz.
Fortunately, we have seen that many ATS9360 work perfectly down to 75 MHz clock rate. We have developed a process by which we can “screen” the ATS9360 board for external clock operation down to 75 MHz, i.e. select ATS9360 that works down to 75 MHz clock frequency.
If customer purchases the screened External Clock Upgrade, we will test the ATS9360 at external clock frequency down to 75 MHz to make sure that it works before shipping it to the customer. If the ATS9360 we are testing does not work down to 75 MHz, we will not ship it to the customer and use a different unit that does work down to 75 MHz. The screened option (ATS9360-006) includes ATS9360-005, i.e. if you purchased the screened option, you do not have to purchase the other.