Hans,
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Looking at web hits for PCM1804 failures other than on QM* products, I only see low level noise issues.
What's being reported in this forum is complete failure.
A 15% failure rate is nuts.
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When final test detects a problem with the PCM1804, do they replace it with stock you buy from directly from TI?
Do these parts also fail in the same way at a 15% rate?
It could be your assembly house is sourcing what they believe are parts from TI, but they are counterfeit.
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Have you looked at the PCM4202?
Claims to be pin and function compatible with the PCM1804, $3.20 US direct from TI at 1K quantity.
From the dates in the datasheet, it came out a couple years after the PCM1804.
Being almost identical, it makes me wonder why they bothered to do this.
Page 23 of the datasheet shows differences between the two parts, none of which look like a problem.
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The PCM1804 and PCM4202 are both over two decades old, TI has the much newer
PCM1820 and TAA5242 parts that might be considered for future QRP Labs products.
Those are very small with a 0.5mm pin pitch and a center ground pad, much harder to work with.
But perfect for a possible QMXnano, to be stuffed into the traditional Altoids tin.? ;-)
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Jerry, KE7ER
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On Wed, Jan 1, 2025 at 11:22 AM, Hans Summers wrote:
Nuts, yes! Welcome to my life.?
