good grief!

J

John Larkin

Guest
http://www.analog.com/UploadedFiles/Data_Sheets/272777363AD5933_prb.pdf



John
 
On Sat, 12 Mar 2005 15:51:35 -0800, John Larkin
<jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX> wrote:

http://www.analog.com/UploadedFiles/Data_Sheets/272777363AD5933_prb.pdf
Click to expand...
---
Yow!!!

I wonder where the gotchas are?

Last time I used them I wound up with some "interesting" power supply
sequencing problems.

--
John Fields
 
On Sat, 12 Mar 2005 18:32:55 -0600, John Fields
<jfields@austininstruments.com> wrote:

On Sat, 12 Mar 2005 15:51:35 -0800, John Larkin
jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX> wrote:

http://www.analog.com/UploadedFiles/Data_Sheets/272777363AD5933_prb.pdf

---
Yow!!!

I wonder where the gotchas are?

Last time I used them I wound up with some "interesting" power supply
sequencing problems.
Click to expand...
Yeah, the ADI stuff does tend to have latchup quirks. We use one of
their octal dacs and it wound up bristling with schottky diodes to
keep it from suiciding.

But this is cool. Somebody could pop it in a box with some sort of pic
or a pc interface and have a killer R-L-C analyzer.

I wonder what it costs.

John
 
http://www.analog.com/UploadedFiles/Data_Sheets/272777363AD5933_prb.pdf

But this is cool. Somebody could pop it in a box with some sort of pic
or a pc interface and have a killer R-L-C analyzer.

I wonder what it costs.

John
Click to expand...
Yeah, or a nifty audio spectrum analyzer (with tracking oscillator).
However, it seems too niche for it to be widely used. I wonder how many
they've sold?

Bob
 
John Larkin <jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX> wrote:

On Sat, 12 Mar 2005 18:32:55 -0600, John Fields
jfields@austininstruments.com> wrote:

On Sat, 12 Mar 2005 15:51:35 -0800, John Larkin
jjSNIPlarkin@highTHISlandPLEASEtechnology.XXX> wrote:

http://www.analog.com/UploadedFiles/Data_Sheets/272777363AD5933_prb.pdf

---
Yow!!!

I wonder where the gotchas are?

Last time I used them I wound up with some "interesting" power supply
sequencing problems.

Yeah, the ADI stuff does tend to have latchup quirks. We use one of
their octal dacs and it wound up bristling with schottky diodes to
keep it from suiciding.

But this is cool. Somebody could pop it in a box with some sort of pic
or a pc interface and have a killer R-L-C analyzer.
Click to expand...
That's not really necessary. The device goes up to 100kHz. A proper
soundcard should be able to handle 90kHz / 24bit. You could make a
similar device using a standard soundcard or USB soundcard chipset if
the input circuitry needs to be a bit more fancy than a standard
soundcard offers.

--
Reply to nico@nctdevpuntnl (punt=.)
Bedrijven en winkels vindt U op www.adresboekje.nl
 
I read in sci.electronics.design that Nico Coesel <nico@puntnl.niks>
wrote (in <4234093e.386903037@news.planet.nl>) about 'good grief!', on
Sun, 13 Mar 2005:
That's not really necessary. The device goes up to 100kHz. A proper
soundcard should be able to handle 90kHz / 24bit. You could make a
similar device using a standard soundcard or USB soundcard chipset if
the input circuitry needs to be a bit more fancy than a standard
soundcard offers.
Click to expand...
I don't quite see how you could easily turn a sound card into a network
analyser.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
John Woodgate <jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that Nico Coesel <nico@puntnl.niks
wrote (in <4234093e.386903037@news.planet.nl>) about 'good grief!', on
Sun, 13 Mar 2005:
That's not really necessary. The device goes up to 100kHz. A proper
soundcard should be able to handle 90kHz / 24bit. You could make a
similar device using a standard soundcard or USB soundcard chipset if
the input circuitry needs to be a bit more fancy than a standard
soundcard offers.

I don't quite see how you could easily turn a sound card into a network
analyser.
Click to expand...
It has an input and an output. Generate a sweep on the output, sample
the signal accross the network, FFT the signal and you'll have a
frequency and phase plot of the network.

--
Reply to nico@nctdevpuntnl (punt=.)
Bedrijven en winkels vindt U op www.adresboekje.nl
 
I read in sci.electronics.design that Nico Coesel <nico@puntnl.niks>
wrote (in <423432eb.397572519@news.planet.nl>) about 'good grief!', on
Sun, 13 Mar 2005:
John Woodgate <jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that Nico Coesel <nico@puntnl.niks
wrote (in <4234093e.386903037@news.planet.nl>) about 'good grief!', on
Sun, 13 Mar 2005:
That's not really necessary. The device goes up to 100kHz. A proper
soundcard should be able to handle 90kHz / 24bit. You could make a
similar device using a standard soundcard or USB soundcard chipset if
the input circuitry needs to be a bit more fancy than a standard
soundcard offers.

I don't quite see how you could easily turn a sound card into a network
analyser.

It has an input and an output. Generate a sweep on the output, sample
the signal accross the network, FFT the signal and you'll have a
frequency and phase plot of the network.
Click to expand...
I may be being dense, but it seems that the sound card is just producing
the sweep. To do the f-Z-phi analysis, you need a dual-channel FFT as
well.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
John Woodgate <jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that Nico Coesel <nico@puntnl.niks
wrote (in <423432eb.397572519@news.planet.nl>) about 'good grief!', on
Sun, 13 Mar 2005:
John Woodgate <jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that Nico Coesel <nico@puntnl.niks
wrote (in <4234093e.386903037@news.planet.nl>) about 'good grief!', on
Sun, 13 Mar 2005:
That's not really necessary. The device goes up to 100kHz. A proper
soundcard should be able to handle 90kHz / 24bit. You could make a
similar device using a standard soundcard or USB soundcard chipset if
the input circuitry needs to be a bit more fancy than a standard
soundcard offers.

I don't quite see how you could easily turn a sound card into a network
analyser.

It has an input and an output. Generate a sweep on the output, sample
the signal accross the network, FFT the signal and you'll have a
frequency and phase plot of the network.


I may be being dense, but it seems that the sound card is just producing
the sweep. To do the f-Z-phi analysis, you need a dual-channel FFT as
well.
Click to expand...
No, the soundcard should also be used as a sampler at the same time.
The PC does the signal processing and other math.

--
Reply to nico@nctdevpuntnl (punt=.)
Bedrijven en winkels vindt U op www.adresboekje.nl
 
On Sun, 13 Mar 2005 23:45:32 GMT, Joerg
<notthisjoergsch@removethispacbell.net> wrote:

I wonder what it costs.

Me, too.
Click to expand...
An announcement page I saw put it this way:

http://www.eeproductcenter.com/printableArticle.jhtml?printable=true&articleID=60406316

"All devices are currently sampling with production quantities of the
CDCs (AD7745 and AD7746) and the IDCs (AD5933: 12-bit, 1
Megasamples/s; and AD5934: 12-bit, 250 Kilosamples/s) slated for May.
The AD7747 CDC is currently sampling with production quantities
planned for August. The devices are available in small 16-lead TSSOP
and 16-lead SSOP with prices ranging from $4.60 to $4.95 (CDC) and
$4.35 to $6.65 (IDC) per unit in 1,000-piece quantities."

I'd guess this means the AD5933 is on the high side of the IDC's, so
$6.65 in 1000's.

Jon
 
On Sun, 13 Mar 2005 09:50:21 +0000, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> wrote:

I read in sci.electronics.design that Nico Coesel <nico@puntnl.niks
wrote (in <4234093e.386903037@news.planet.nl>) about 'good grief!', on
Sun, 13 Mar 2005:
That's not really necessary. The device goes up to 100kHz. A proper
soundcard should be able to handle 90kHz / 24bit. You could make a
similar device using a standard soundcard or USB soundcard chipset if
the input circuitry needs to be a bit more fancy than a standard
soundcard offers.

I don't quite see how you could easily turn a sound card into a network
analyser.
Click to expand...
I think it was a spectrum analyser he was talking about.

You can turn it into a network analyser, though and I have done it.
But it isn't easy making the directional bridge couplers. Probably
somebody makes them, but I wanted to do it for nothing.

After that the software for 12 term normalization and calibration
takes some writing.

d

Pearce Consulting
http://www.pearce.uk.com
 
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