toggle quoted messageShow quoted text
The 400khz spec is part of the i2c standard.
Easy to imagine that chips can go much faster.
Especially with a short bus and no other loads.
Updating the frequency on an si5351 requires a bunch of register writes.
A DDS chip would require fewer writes and provides much more flexibility.
But the cheapest DDS chips are 10x the price of the $1 si5351.
ARM processors can be cheap and powerful.
But you work with what you got.
And if you got a QCX to do this, that's totally amazing!
On Mon, Jan 28, 2019 at 02:32 PM, Jerry Gaffke wrote:
Running an 800khz i2c bus into the si5351 is over spec by a factor of two,
Maybe one of the DDS chips would be more appropriate here.