Rubidium atomic clock in 2inch OCXO package

MAC-SA5X is a rubidium atomic with:

• <5.0E^-11 frequency stability over operating temperature
• <5.0E^-11 per month aging rate
• -40 to +75°C operation

“Its combination of low monthly drift rate, short-term stability and stability during temperature changes allow the device to maintain precise frequency and timing requirements during extended periods of hold-over during GNSS outages or for applications where large rack-mount clocks are not possible,” according to the firm.

According to the data sheet, sub-microsecond hold-over for 48 hours is predicted, assuming zero initial phase/frequency offset, a static 25˚C environment and having been powered-up for 30 days prior to the hold-over.

Packaging is 50.8 x 50.8mm and 47cm³, intended to be the same size as an ovened crystal oscillator (OCXO). “MAC-SA5X is designed with the same footprint as previous generation miniature atomic clock technology,” said Microchip. Also, it “provides backward compatibility with its predecessor MAC-SA.3Xm family.”

Power is 6.3W.

The evaluation kit is part 090-44500-000

The device is available now for what Microchip calls “pre-sampling”. It will be available for delivery in February.

According to the firm, it has delivered more than 275,000 rubidium clocks, 120,000 chip-scale atomic clocks (CSACs), 12,500 Cesium clocks and 200 hydrogen masers.