Hello,
I have PCM1702 in my DAC, but I don't know what grade it is(J,K)? I'm confused because it has two marked dots?
Thx!
I have PCM1702 in my DAC, but I don't know what grade it is(J,K)? I'm confused because it has two marked dots?
Thx!
If you can overcome the Datasheet Phobia that effects so many in the forum, see page 3 of the PCM1702 datasheet.
I suggest you find out who put the dots there and ask them for the meaning because neither Burr-Brown nor Texas Instruments put the dots on the chips before they left the chip factory. Why don't you search the internet, because everything you read on the internet is absolutely true. A casual search reveals many web pages that claim one white dot means J-grade and two white dots mean K-grade. So there you have your answer. Whether they are K-grade or not doesn't really matter. I doubt you will hear the difference because as long as you use them mounted on DIP adapters they will perform like ungraded PCM1702P.
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Thank you for your answer. I didn't find on web photo or explanation for two dots, only white or red dot on 10th leg. So its K grade chip. The DAC with chips was bought from Analogmetrics. I asked them, but no answer. Why are chips mounted on DIP adapters ungraded? The base is PCM58 with PCM1702 conversion board, and what will happen if I put PCM58 to PCM63 board? Is it possible?
It's not that the chip is ungraded; apparently you won't be able to get the K-grade performance out of the chip given the degraded electrical environment the adapters present to the overall chip/circuit board combo when compared to soldering PCM1704U-K chip directly onto a board, with regards to overall signal integrity/grounding/decoupling etc.
You might be caught between a still very palatable rock and a hard place, IIRC you can't desolder a PCM1704 without compromising the chip itself. Maybe you could with care and low temp solder, maybe don't worry about it.
You might be caught between a still very palatable rock and a hard place, IIRC you can't desolder a PCM1704 without compromising the chip itself. Maybe you could with care and low temp solder, maybe don't worry about it.