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DIY Audio Analyzer with AK5397/AK5394A and AK4490
DIY Audio Analyzer with AK5397/AK5394A and AK4490
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Old 27th October 2018, 02:13 AM   #2441
Terry Demol is offline Terry Demol  Australia
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Quote:
Originally Posted by 1audio View Post
That's pretty distressing. None of the replacements are really on a par. Many tradeoffs for lower noise and wider bandwidth. The HF noise corner is much lower on all the others as well.
If you run AK5578 in mono mode, ie; 8 -> 1, it should be capable of good enough performance, looking at measurements of RME ADI-2 Pro.

Obviously using sample rates above 192k brings more HF noise. Yes HF noise corner is lower but you can get 130dB DR (20k BW) so you win some / loose some.

Otherwise, I guess you better start cooking up a 24 or 32 bit SAR ADC.

T
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Old 27th October 2018, 02:28 AM   #2442
chris719 is offline chris719  United States
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It's kind of a pain to use the AK5578 in mono mode, you'll have to have an input buffer than can actually drive 8 differential ADC inputs without distorting or have the added cost and real-estate of 8 channels worth of input buffers.
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Old 27th October 2018, 04:43 AM   #2443
Terry Demol is offline Terry Demol  Australia
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Originally Posted by chris719 View Post
It's kind of a pain to use the AK5578 in mono mode, you'll have to have an input buffer than can actually drive 8 differential ADC inputs without distorting or have the added cost and real-estate of 8 channels worth of input buffers.
Stop being a pussy!

Driving 4 or 8 channels of 3.6k IP Z is not too hard, especially at the small voltage swings required. The bottom line is, it may be the only decent option after the 5394's run out.

T
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Old 27th October 2018, 05:18 AM   #2444
chris719 is offline chris719  United States
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Yeah I suppose it's not that bad, might be good with a composite amplifier.

Aside from the SAR ADC Frex is using, this is something that caught my eye:

http://www.ti.com/lit/ds/symlink/ads127l01.pdf

Now, I haven't gone through the datasheet thoroughly to see what tradeoffs there are in the various modes it has. Nice looking part though.
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Old 27th October 2018, 02:17 PM   #2445
anatech is offline anatech  Canada
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DIY Audio Analyzer with AK5397/AK5394A and AK4490
It would seem that this application is intended for this chip.
Quote:
2 Applications
• Vibration and Modal Analysis
• Data Acquisition Systems
• Acoustics and Dynamic Strain Gauges
• Power Quality Analysis
(from the data sheet)

-Chris
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Old 27th October 2018, 09:45 PM   #2446
Joseph K is offline Joseph K  Hungary
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Hmm.. typically all items in the list are low frequency, high precision applications. Is it high speed enough for audio?
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Old 28th October 2018, 01:11 AM   #2447
kevinkr is offline kevinkr  United States
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Yes if 230kHz maximum bandwidth is sufficient...
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Old 29th October 2018, 11:24 AM   #2448
Techland is offline Techland  Germany
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8 channels of AK5578 summed - yummy! But whoever starts such a project also needs to use the same 'fix' that RME added to their ADI-2 Pro to reduce the chip's frequency response ripple, which otherwise makes the AK a bad choice for measurements.

ADI-2 Pro Firmware Update DSP 21 (details) (Page 1) — ADI-2 Pro & ADI-2 DAC — RME User Forum
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Old 31st October 2018, 07:53 AM   #2449
chris719 is offline chris719  United States
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Surprised they went so cheap on the filter. The AK5397 seems to be better in this regard but it seems to have worse distortion performance. Annoying that they are discontinuing their only ADC with no compromises.
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Old 31st October 2018, 09:15 AM   #2450
diyralf is offline diyralf
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This chip has a lot of uC connections. Can it also operate stand-alone?
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