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Old 3rd March 2012, 09:45 PM   #1
audio39 is offline audio39  Canada
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Join Date: Nov 2010
Location: Kanata, Ontario
Default Burr Brown PCM1702...K, U-K, U, P, J ???

I'm in the final phase of securing a DAC I've wanted for some time that uses 4 PCM1702 20-dip chips per channel.

So, I'm a mechanical guy, and all this digital stuff is giving me a headache.

I have found that the manufacturer used the PCM1702, whereas some companies used the PCM1702U, others the PCM1702J, and I could type for a while, but what is the difference between the chips.

I found some original prices on the net that seem to indicate that the K, U-K, and the U were more expensive - does this equate to better SNR? Is it an indicator of better QA techniques and mean that these chips are better matched?

Thanks in advance.
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Old 3rd March 2012, 09:54 PM   #2
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Location: Lyon
Hi Audio39

Some hints there : http://www.ti.com/lit/ds/symlink/pcm1702.pdf
Maybe the answer is here...
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Old 3rd March 2012, 10:43 PM   #3
audio39 is offline audio39  Canada
diyAudio Member
Join Date: Nov 2010
Location: Kanata, Ontario
I've been through all of that data but it is just not clear to me.

My first interpretation of that data lead me to conclude that the "U" and the "K" marked chips would provide better SNR...but after looking at all the data I could find, well, it seemed less clear.
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Old 3rd March 2012, 11:15 PM   #4
audio39 is offline audio39  Canada
diyAudio Member
Join Date: Nov 2010
Location: Kanata, Ontario
Ok, so the "U" indicates that the chip is 20 pin. The "J" and the "K" are grade marks.

But there are a few others...I have found the "L" and others.

So is the "K" the top of the heap, and if so, what does that mean...better SNR??
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Old 4th March 2012, 02:56 AM   #5
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Join Date: Oct 2006
The U means surface mount package. The grade marks are none, J and K, from least to best, and refers to how percisely they are calibrated in laser trimming. The datasheet does specify the differences in the performance data.
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