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CT scan analysis of various DAC chips
CT scan analysis of various DAC chips
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Old 19th June 2019, 05:11 PM   #1
weissi is offline weissi  Austria
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Default CT scan analysis of various DAC chips

Hello fellows,

I'll have the possibilites to access a CT scan at a local research facility. The CT is said to offer details in the 0.000001m range.

One scan run takes about 45min, in total I'll have about 3h access to the scanner.

Already set are scans of:
- a defective TDA1541A
- defective/faked AD1862
- re-labeled PCM58

In my inventory I further have:
- PCM69
- PCM67
- PCM1794a
- AD1865
- AD1955
- CS4328 (my personal favorite)
- TDA1540
- TDA1387
- TDA1305
- various digital filter ICs (DF1706, SM5813, SM5842, YSF210, YM3434

There is one requirement that I was ordered to: To describe the test objectives....
I thought I can argue about the defective parts (identify the failure mode) and the old-school "hybrid", e.g. Bipolar/CMOS/CrNi parts.
I have no real arguments about the latter standard-CMOS parts, so maybe one of you fellows have some input...

Cheers, Markus
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Old 22nd June 2019, 12:25 AM   #2
miro1360 is offline miro1360  Europe
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PCM1704 is missing (or PCM1702)
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Old 22nd June 2019, 12:43 PM   #3
weissi is offline weissi  Austria
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I don't have PCM1704(2) and I'm not planning to get some.
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Old 22nd June 2019, 06:59 PM   #4
Ken Newton is offline Ken Newton  United States
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I suggest that there's no sense in consuming any part of your 3 hour access time scanning known defective devices. FMA (failure mode analysis) is valuable for design and production improvement, but are of little use otherwise. It seems to me that the most benefit to be had here is in identifying counterfeit devices, assuming that CT scanning would reveal that. Identifying which area of an device is defective still requires knowledge of the circuit funtioning of that area even to assist in design and production. Identifying which devices are counterfeit, and how generally widespread is that problem, is useful information.

Last edited by Ken Newton; 22nd June 2019 at 07:06 PM.
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Old 23rd June 2019, 12:32 PM   #5
weissi is offline weissi  Austria
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Well, it basically is just for the pure fun and because I have the opportunity.
I shall repeat that I *need* to provide some background why I want to scan a particular part, so a defective one is the easiest approach (?) - that's because of my non-professional backround in chip design.
If I could provide more substance why I want to scan a particular part ... that is why I started this thread!

I'm more or less set for the CS4328 'cause I really want to see if that's a dual chip assembly.
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Last edited by weissi; 23rd June 2019 at 12:36 PM.
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Old 29th June 2019, 03:33 AM   #6
werewolf is offline werewolf  United States
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Quote:
Originally Posted by weissi View Post
Well, it basically is just for the pure fun and because I have the opportunity.
I shall repeat that I *need* to provide some background why I want to scan a particular part, so a defective one is the easiest approach (?) - that's because of my non-professional backround in chip design.
If I could provide more substance why I want to scan a particular part ... that is why I started this thread!

I'm more or less set for the CS4328 'cause I really want to see if that's a dual chip assembly.
Yes, the CS4328 is a dual-chip package.

Please see: AES Convention Papers Forum >> 18-Bit Stereo D/A Converter with Integrated Digital and Analog Filters

Last edited by werewolf; 29th June 2019 at 03:45 AM.
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Old 11th July 2019, 03:03 PM   #7
esl 63 is offline esl 63
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And the result is?
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Old 11th July 2019, 04:20 PM   #8
weissi is offline weissi  Austria
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Not done yet, have to wait another 2 or so weeks...
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Old 13th July 2019, 02:47 AM   #9
IVX is offline IVX  Ukraine
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I think such old parts had >>1um process and easily visible by optical microscope without scanning by X-rays. However, the method is destructive because of the need to open die.
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