Re: ball-hours

From	rickman <gnuarm@gmail.com>
Newsgroups	sci.electronics.design, comp.lang.forth
Subject	Re: ball-hours
Date	2014-10-16 20:59 -0400
Organization	A noiseless patient Spider
Message-ID	<m1ppm6$jvr$1@dont-email.me> (permalink)
References	(7 earlier) <ca8da5FfvlmU1@mid.individual.net> <m1nbn1$pu7$1@dont-email.me> <caagkuF1v4jU1@mid.individual.net> <m1p626$nu5$1@dont-email.me> <caaokmF457jU1@mid.individual.net>

Cross-posted to 2 groups.

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On 10/16/2014 4:37 PM, Joerg wrote:
> rickman wrote:
>> Each processor is very low power when running flat out, just 5 mW.  But
>> they almost never run flat out.  Because they are asynchronous they
>> spend most of their time stopped when they draw 0.0875 uW, yes, that's
>> less than a tenth of a uW for each processor or just 12 uW for the whole
>> chip.  The processors respond to stimuli in just nanoseconds, not 100's
>> or even 10' but single digit nanoseconds.
>>
>> Trust me, power will not be a problem with this part.  It is a very
>> different beast to program however.
>>
>
> I wonder how that company is doing. I read about their products years
> ago but never seen any in schematics and I get to see a lot of new stuff
> because some of my daily bread is EMC remedy.

All kidding aside, your application may be one that is well suited to 
the GA144.  With your data rates the GA144 can certainly keep up 
processing wise.  The CODEC I/O would be no problem at all.  The I2S 
interface can be bit banged by 700 MHz processors.

The only issues would be designing the algorithms to perform the signal 
processing.  There is no math library that I know of.  So you would need 
to design your own.

I think the chip would be running at a small fraction of a watt.  With 
every node running flat out the power consumption is under a watt.

> What I mean is that ADCs on processors generally cannot hold jitter low
> enough to truly deliver a 96dB SNR. I found that even 12 bits on-chip is
> already a serious challenge.

Not that it is a serious contender, but ADI makes an old ARM7 chip with 
16 bit ADCs on board, not sure how many, I don't think it was five, it 
may have been four.  It was only 33 MHz and doesn't have any of the DSP 
like instructions.  But they designed it with the analog in mind.  I 
seem to recall they marketed it with their ADC families rather than with 
their processors.

>   18 bits of what exactly?  I have seen lots of devices with 24
>> bits but only 96 dB SNR.  Do you need 108 dB SNR?  You won't get that
>> from the GA144 ADCs at 48 kHz.
>>
>
> True 96dB across DC-15kHz would be enough.

The GA144 ADCs are just not quite there.  Like I said, they get 15 bits 
at 48 kHz sample rate.  I don't recall how slow the sampling needs to be 
to get 16 bits (96 dB nominally).  Likely it is about 12 kHz.

-- 

Rick

Thread

Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-15 00:25 -0400
  Re: ball-hours bruce.person@gmail.com - 2014-10-14 23:51 -0700
    Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-15 03:15 -0400
  Re: ball-hours Joerg <news@analogconsultants.com> - 2014-10-15 05:36 -0700
    Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-15 16:22 -0400
      Re: ball-hours Joerg <news@analogconsultants.com> - 2014-10-15 16:12 -0700
        Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-15 22:48 -0400
          Re: ball-hours Joerg <news@analogconsultants.com> - 2014-10-16 11:21 -0700
            Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-16 15:24 -0400
              Re: ball-hours Joerg <news@analogconsultants.com> - 2014-10-16 13:37 -0700
                Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-16 17:42 -0400
                Re: ball-hours Joerg <news@analogconsultants.com> - 2014-10-17 07:14 -0700
                Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-17 14:03 -0400
                Re: ball-hours Joerg <news@analogconsultants.com> - 2014-10-17 12:03 -0700
                Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-17 15:23 -0400
                Re: ball-hours Joerg <news@analogconsultants.com> - 2014-10-17 12:44 -0700
                Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-17 18:37 -0400
                Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-16 20:59 -0400
                Re: ball-hours albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-10-17 08:43 +0000
                Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-17 13:53 -0400
                Re: ball-hours Joerg <news@analogconsultants.com> - 2014-10-17 07:50 -0700
        Re: ball-hours Raimond Dragomir <raimond.dragomir@gmail.com> - 2014-10-15 20:42 -0700
          Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-16 01:50 -0400
            Re: ball-hours Raimond Dragomir <raimond.dragomir@gmail.com> - 2014-10-16 00:49 -0700
              Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-16 05:14 -0400
            Re: ball-hours Joerg <news@analogconsultants.com> - 2014-10-16 11:58 -0700
        Re: ball-hours "Elizabeth D. Rather" <erather@forth.com> - 2014-10-16 08:32 -1000
          Re: ball-hours rickman <gnuarm@gmail.com> - 2014-10-16 15:32 -0400
          Re: ball-hours Joerg <news@analogconsultants.com> - 2014-10-16 13:45 -0700

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