[sdiy] Outputs grounded! Re: SSI2164 datasheet updated

rsdio at audiobanshee.com rsdio at audiobanshee.com
Mon Aug 13 02:10:34 CEST 2018

Thanks, Neil.

On Aug 12, 2018, at 3:35 PM, Neil Johnson <neil.johnson71 at gmail.com> wrote:
> Hi David,
>> a) The 2164 datasheet gives no guidance at all as to what to do with unused
>> VCAs.
> That is definitely true of the original SSM2164 datasheet (and poorly
> copied by CoolAudio).  There are some real howlers in that datasheet
> and I understand the designers of the SSM2164 were rather annoyed with
> Analog Devices when it came out.
>> I know that I am a relative neophyte to
>> electronic design, and have no formal background in electronics (my day job
>> is as a metallurgical engineering professor) other than 10 years of
>> experience learning by doing.  However, my designs represent millions of
>> dollars of revenue for Intellijel, and many hundreds of happy customers, so
>> I figure that counts for something.
> It certainly does!  The most important aspect though, and is reflected
> in pretty much any profession, whether it is electronic engineering or
> metallurgical engineering, is continual learning.  Certainly the IET
> (through which I get my chartered status) mandates continuing
> professional development - keeping your technical and professional
> knowledge and skills alive through continuous learning.  To bring this
> thought home: when I first started playing with the SSM2164 it is was
> only available from Analog Devices, and tech support was thin on the
> ground.  Then ADI EOLed it, so goodbye any official support.
> CoolAudio somehow picked up the line, but good luck getting any
> technical support from those guys.  It is only in the last year or so
> that the emergence of Sound Semiconductor Inc has brought out of the
> woodwork the original designers of the SSM2164, who took the
> opportunity to fix some of the issues in the original design, make
> improvements, and are more than happy to support these new parts.  And
> all through this I have been learning more and more about the internal
> workings of the 2164 (not to mention the technical archeology of
> digging through the SSM2014 and SSM2018 chips, reading through Doug
> Frey's patents and AES articles, and so on).
> Learning... it's fun!
> Cheers,
> Neil

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