|
Remember that the external wordclock signal has to go through more distribution before it gets to the PLL inside the converter - and it uses the same PLL.
Good crystal clock references are cheap - there is nobody who uses a bad one inside a converter that costs anything over $49.99. It's the distribution, power supply decoupling, PLL design and other things inside the converter that make clocks marginal at the conversion sampler.
I should go into business selling blingy external clocks - they're cheap to build and the marketing is already done.....
....I'll cringe all the way to the bank, but I've done less scrupulous things for money before.
-tINY
|