linuxaudio.org

Am Samstag, 14. November 2009 schrieb Karl Hammar:

quoted text
> Folderol:

> > On Sat, 14 Nov 2009 09:34:15 -0500

> >

...

quoted text
> > On the hardware side, that Atmel development kit (2) looks very

> > interesting as a proving ground as it already has both the network and

> > the 48kHz DAC parts built in.

> >

> > For rough testing it could be used to lock a pair of ADCs. TLC4545ID

> > looks like a good (cheap) possibility here.

>

> Found it, datasheet at [1], it seems to cost ~12USD. There is no

> "start" pin to be able to simultaneously start multiple converters.

> And you cannot daisychain this chip. [2] can be daisy-chained, but

> with a maximum of eigth channels, but it can be synced.

>

> If we are going to have multiple analog inputs at higt sample rate,

> isn't it better to have a parallell interface. With spi the number of

> channels will be limited to something like 8 for a 24bit converter.

> Plus that the AT32AP7000/AT91SAM9260 only has two spi-busses.

>

> Maybe ad7762 [2] could be useful (28 USD),

>

> > (1) http://www-net.cs.umass.edu/kurose/transport/UDP.html

> > (2) http://www.atmel.com/dyn/products/tools_card.asp?tool_id=4102

>

> [1] http://focus.ti.com/lit/ds/symlink/tlc4545.pdf

> [2] http://www.analog.com/static/imported-files/data_sheets/AD7764.pdf

> [3] http://www.analog.com/static/imported-files/data_sheets/AD7762.pdf

>

> Regards,

> /Karl

Hi Karl, hi LAU users
I've followed the discussion about timing and synchronisation - what do you

think about separation of number crunching and communication (ATNGW100) from

the "dirty business" of ADC.

We need the codec, some kind of amplification, a clean power supply etc. to get

a good S/N ratio - and we need it for a lot of channels.

There exist many (more or less) pro-audio devices with well documented

interfaces (SPDIF/AES-3; ADAT; MADI) - a cheap one is e.g. the Behringer

ADA8000 for about 200 € [1] with eight mic (phantom power) or line inputs and

eight line outputs. The codecs are 24bit@44.1/48 kHz [2] 
[1] http://www.thomann.de/gb/behringer_ultragain_pro8_digital_ada8000.htm

[2] http://images4.thomann.de/pics/prod/164573_manual_eng.pdf
Regards

Martin Homuth-Rosemann

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