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RE: [linrad] re: CS5396
- Subject: RE: [linrad] re: CS5396
- Date: Wed, 20 Nov 2002 12:13:09 -0800 (PST)
Have you looked at the Maxim ADC chips. Prices in the range
of US$60 for one unit but they will ship free samples if you
ask. They make ADC specifically for sampeling RF or IF
frequency. The "MAX1200" for example does 16-bits at
one megasample rate. If you can go with less bits (8) you can
get sample rates at 60Mhz. see www.maxim-ic.com
I have worked on a few radar projects (which now that I think of
it) were actually software radios. We sampled in quadarure at
the tens of megasample rate at 8-bits and performed synthethic
aperature algorithum in software.
The computers we used at the time (12 or 14 years ago) were about
as powerful as today's PCs but had better I/O capability.
OK, let me backup.
I thought it might be possible to home brew a software radio
that decoded most modes. I looked around and found this project.
I also found the softmodem drivers built into Linux. Both projects
are built around sound cards. The problem is sound cards have,
and no surprize, audio bandwidths. I think sound cards will
always have limited bandwidth. So I thought about looking into
digital video then found that the chip makers already are thinking
about supporting software radio and the component prices are not
--- Leif_Asbrink <leif.asbrink@xxxxxxxxxxxxxxxxxx> wrote:
> Hi Toki,
> > > Thanks to Pete, KC1HR I now know that there is an ADC
> > > chip CS5396 from (http://www.cirrus.com).
> > >
> > > This is a 24 bit 96kHz stereo AD converter and there
> > > is an evaluation board for it.
> > >
> > > The CS5396 is 20dB better than the Delta 44!!
> > What does make you so happy ?
> Simply that this information was new to me:-)
> Even after modifying the Delta44 to actually give the
> full performance of the AK4524VF, the Delta44 is limiting
> Linrad performance with the WSE RX2500.
> > Almost every companies that develop ADC device have evaluation
> > for their products.
> > For example;
> > You can get information about evaluation board of the most advanced
> > AD converter from;
> > http://www.asahi-kasei.co.jp/akm/
> > AK5394A is a 24 bit 192kHz stereo AD converter with s/n 123db.
> > The evaluation board also has printer, coax, and optic interfaces
> > cirrus.
> Now you make me even more happy:-)
> The technology is there - it only remains to learn how to use it!
> (How to get four channels of data into an application under Linux)
> > I don't believe the cirrus can develop better analog device than
> the akm.
> There is one problem with AKM though. I was told by their
> here in Sweden that I can only buy AKM ICs in full reels,
> 3000 pieces if I remember correctly:-(
> > Anyway, problem is always the cost.
> I did not find any info on the cost for either evaluation board but
> I would not be surprised if it could compete well with the
> professional audio cards.
> I will stay with the Delta44 for now, with some luck someone else
> will find a way to get better data into the PC.
> Leif / SM5BSZ
Home: 310-376-1029 chrisalbertson90278@xxxxxxxxx
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