gee wrote:You can remove the 16MHz crystal, replace it with a 1K resistor, and drive the XIN pin with the rubidium source through a 0.1uF capacitor. This means your AVR is now clocked at 10MHz instead of 16MHz, but it's probably the easiest way to do things.
I designed a GPS-calibrated a few years back, using an ATMega168 driven by a clipped-sine TCXO using the same method.
Only catch is, if your clock disappears your micro is dead - even ISP etc. won't work.
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