[TangerineSDR] VLF 4-channel ADC

[Jonathan]

I was able to get a response from an AKM sales rep, but it was not
with good news. He told me the fab this ADC is made in caught fire
last week and had a very negative impact on business. They can't sell
me an evaluation board and won't procure gerbers/BOM because of it.
See his email below:

Hi Jonathon,

As Peter mentioned, the AKM fab that produces this A/D converter
caught fire last week.  We don’t know the impact yet to our business,
but it’s not going to be good.  Providing you the board layout docs
won’t help you if you can’t find any A/D’s to populate it.

We are overwhelmed with customer issues that use our converters in
production, please understand we can’t support your request.

Thank you.



Robert (Bob) Wayland

AKM Semiconductor, Inc.

Area Business Development Mgr

856.904.7878

Digi-Key is depleted in stock until March of 2021. I couldn't find it
anywhere else.

I still feel this is a great direction to be going in and it's still
early with their fab fire.



On 10/27/20, David G. McGaw via TangerineSDR
<tangerinesdr at lists.tapr.org> wrote:
> Yes, that is correct.  These are high-end consumer and professional
> audio components.
>
> By the way, SACD is not anything special.  It is just a bit stream from
> a sigma-delta ADC modulator minus the FIR filter.  In fact, the original
> SACD spec was based on the 1986 vintage Analog Devices AD1879 in a test
> mode that outputs the 1-bit stream from its modulator.  This was never
> intended to be used this way, so the SACD spec audio actually has a
> tremendous amount of noise above 20kHz which was intended to be cut by
> the digital filter.  It was created by Sony because their CD patent had
> run out.  DVD-Audio was always the better format.
>
> David N1HAC
>
> On 10/26/20 11:40 PM, Jonathan wrote:
>> David,
>>
>> Thank you for finding this! Scotty and I are looking at it now. It has
>> really good performance!
>>
>> Nathaniel,
>>
>> I think this will be a suitable replacement. It looks like it is
>> designed for recording high definition audio, like the kind of high
>> definition audio in SACDs and similar formats.
>>
>> Jonathan
>> KC3EEY
>>
>> On Mon, Oct 26, 2020 at 11:04 PM David G. McGaw via TangerineSDR
>> <tangerinesdr at lists.tapr.org <mailto:tangerinesdr at lists.tapr.org>> wrote:
>>
>>     Here is an AKM 4-channel part that has extremely good THD+N and
>>     dynamic
>>
>>     range and can do the full 192kHz bandwidth.  It can run up to 768kHz
>>
>>     sample rate with even greater bandwidth.  It also has DSD output that
>>
>>     would allow custom filters.
>>
>>
>>
>>     $13.02 from Digi-Key single part price!
>>
>>
>>
>>     https://www.akm.com/us/en/products/audio/audio-adc/ak5574en/
>>
>> <https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.akm.com%2Fus%2Fen%2Fproducts%2Faudio%2Faudio-adc%2Fak5574en%2F&data=04%7C01%7Cdavid.g.mcgaw%40dartmouth.edu%7C7fb58d195baa408702a108d87a2a24a2%7C995b093648d640e5a31ebf689ec9446f%7C0%7C0%7C637393668722572399%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=X0lWwCacwLz6BLy0uvAD987%2BhCw%2F22XHrHPm3JPxbeI%3D&reserved=0>
>>
>>
>>
>>     73,
>>
>>
>>
>>     David N1HAC
>>
>>
>>
>>     --
>>
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