The factory pre-programmed versions of the Si5351A are often not suitable because they have a different I2C address as well as default registers values wer up for specific output frequencies.?
Digikey, Mouser, Arrow etc should not be selling these factory pre-programmed versions, normally falsely associating them with the standard datasheet which does not apply in totality (such as different I2C address, non zero default register contents at powee-up). I did inform them years ago, but of course they continued selling then. I suspect it has misled many unsuspecting purchasers. They below with other fell-off-the-back-of-a-lorry junk on eBay or surplus stores, not misrepresented by major reputable distributors.?
So: never try to use Si5351A_Bnnnnn_ ... types. Stick to Si5351A_B_GT (or GTR). Or MS5351M (as far as I'm aware MS5351M isn't sold in factory pre-programmed versions anyway).?
On Mon, Oct 14, 2024, 02:40 Jerry Gaffke via <jgaffke=[email protected]> wrote:
Good to know.? Thanks!
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On Sun, Oct 13, 2024 at 03:42 PM, Ronald Taylor wrote:
Hi All. Back in 2020 I mistakenly ordered a Si5351 that was pre-programmed for a fixed frequency and it did not work in a QCX I was repairing. I had to order the correct one that was not programmed. Since then I've only used the un-programmed versions, both Si and MS5351 depending on what was available.
