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02-03-2017 12:23 PM
Faced with such a problem. There SI5351 chip labeled A3BS 405. When programming these chips are no problems!
There are lot of chips labeled SI5351 AFTP 137.
There were problems with the programming. HN output of these chips, the frequency is unstable and has a deviation of about ± 1 MHz. Chips marked AFTP 137, only work with Arduino library (Etherkit_Si5351).
Chips SI5351 marked A3BS 405 work for all libraries!
These devices (AFTP 137) differ in the structure?
SI5351 chip labeled AFTP 137 has a special series?
Or the party SI5351 marked AFTP 137 fake?
Help to solve the problem.
02-06-2017 02:45 PM
That piece of Arduino code. Chips with A3BS 405 marked runs this code.
The chips are labeled 137 AFTP not working !!!
That's why I asked the question, can have different control registers?
si5351.init (SI5351_CRYSTAL_LOAD_8PF, 27 million);
si5351.set_pll (SI5351_PLL_FIXED, SI5351_PLLA);
si5351.set_freq ((vfo * SI5351_FREQ_MULT), SI5351_PLL_FIXED, SI5351_CLK0);
Chip marked AFTP 137 only works with that code.
si5351.init (SI5351_CRYSTAL_LOAD_8PF, 27000000, 0);
si5351.set_vcxo (PLLB_FREQ, 40);
si5351.set_ms_source (SI5351_CLK0, SI5351_PLLB);
si5351.set_freq_manual (1400000000ULL, PLLB_FREQ, SI5351_CLK0);
These chips are different registers?
02-06-2017 02:58 PM
No. We have only one version of these ICs. Please initiate a return for the parts that malfunction. It is likely a quality issue (i.e. a "faulty" device that we need to investigate for the cause of failure).
02-06-2017 03:16 PM
As far we know, these are not fake. However, if you purchased it from a distributor and initiate a return through that distributor for a "Quality issue", we will inspect it and tell our findings (including if this part turned out to be a fake IC).
The 137 AFTP top marking indicates that the IC is legitimate.