If you read the datasheet, the Si5351 claims to have a 50 ohm output.
But yes, it is primarily designed to replace cheap 4 pin crystal oscillators.
Jerry
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On Tue, Dec 17, 2019 at 08:24 PM, Bob Clarke wrote:
It¡¯s a clock generator and was designed to drive a logical load, that is, a CMOS or TTL input, and definitely not a 50 ohm resistance. The first rule in a situation like this is to *read* the data sheet and see what the actual spec is, then add an appropriate buffer. You can go the elegant route with an emitter follower or use a bunch of inverters in parallel.?
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