Am Samstag, 14. November 2009 schrieb Karl Hammar: > Folderol: > > On Sat, 14 Nov 2009 09:34:15 -0500 > > ... > > 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@xxxx/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 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
