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Old 30th January 2013, 06:46 AM   #21
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Hi,

You may also find this upcoming ADC card from Twisted Pear Audio interesting:

ES9102 ADC Module

As I understand it is still "in the mold" but should be with a USB connection and 384 kHz/24 bit resolution. Don't know about the price though.

In case you are able to find a card based on the AT1201 from Ardatech that might also be interesting .. ? They do have an evaluation board but if I remember correctly it's about USD 600 and needs an interface to a PC.

BTW: Do you have a link to Dr. W Tempest's quote?

Best regards,

Jesper
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Old 30th January 2013, 07:06 AM   #22
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Quote:
Originally Posted by Telstar View Post
Opinions? Someone else managed to interface well an ADC to a computer for audio measurements?

My reluctance of using just an emu 0204 or even the qa400 is the poor HF performance which makes them unusable above 30khz (when set at 192k)
I would like to do a 20k fft properly, and 19+20k imd.
IMO don't use an S-D based ADC where you're looking to make measurements related to audio SQ. SAR is the only way to go, but then you probably have to roll your own design. Plenty of affordable SAR ADC chips available though and 192kHz sample rate is a walk in the park with no HF distortion issues.
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Old 30th January 2013, 10:42 AM   #23
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Quote:
Originally Posted by abraxalito View Post
IMO don't use an S-D based ADC where you're looking to make measurements related to audio SQ. SAR is the only way to go, but then you probably have to roll your own design. Plenty of affordable SAR ADC chips available though and 192kHz sample rate is a walk in the park with no HF distortion issues.
Yeah, and some multibit products are? How many bits do I need?

The TI 4222 is partially multibit (along the lines of the 1794), would that be fine? I dont know anyone using it for audio still, but I saw it mentioned on quantum asylum website.
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Old 30th January 2013, 10:52 AM   #24
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http://www.ardatech.com/pdf/AT1201EVK%20UG.pdf
how does this look? I dont see the typical noisefloor to raise around 30-40khz.
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Old 30th January 2013, 10:58 AM   #25
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its vaporware
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Old 30th January 2013, 12:04 PM   #26
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qusp I think you got confused between the ADC and the DAC from Arda. The ADC is very much extant and being used in Ayre's ADC (QA-9).

Multibit S-D is still pretty terrible to my ears in terms of noise modulation - here's an ADC chip you could look at LTC2376-18 - 18-Bit, 250ksps, Low Power SAR ADC with 102dB SNR - Linear Technology

To get the data into a computer you'd probably want a USB interface, perhaps the SDR widget guys have the right code?

The other thing not to forget is an AAF, not trivial designing one of these to be adequately transparent.
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Old 30th January 2013, 12:46 PM   #27
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Quote:
Originally Posted by abraxalito View Post
Multibit S-D is still pretty terrible to my ears in terms of noise modulation - here's an ADC chip you could look at LTC2376-18 - 18-Bit, 250ksps, Low Power SAR ADC with 102dB SNR - Linear Technology

To get the data into a computer you'd probably want a USB interface, perhaps the SDR widget guys have the right code?

The other thing not to forget is an AAF, not trivial designing one of these to be adequately transparent.
Interesting chip. For usb i was thinking at the minidisp usbstreamer, but it's limited to 192k, as all xmos based hardware. But that should be enough if the ADC is clean to a few khz.
"only" problem I see is the lack of even a reference board to start working with.
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Old 30th January 2013, 12:55 PM   #28
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Quote:
Originally Posted by abraxalito View Post
qusp I think you got confused between the ADC and the DAC from Arda. The ADC is very much extant and being used in Ayre's ADC (QA-9).

Multibit S-D is still pretty terrible to my ears in terms of noise modulation - here's an ADC chip you could look at LTC2376-18 - 18-Bit, 250ksps, Low Power SAR ADC with 102dB SNR - Linear Technology

To get the data into a computer you'd probably want a USB interface, perhaps the SDR widget guys have the right code?

The other thing not to forget is an AAF, not trivial designing one of these to be adequately transparent.
the chip is still vaporware as the company is kaput, guess ayre just bought some while they were available. no confusion, there were even a few for sale on here, I was tempted but the lack of any sort of development or support for FW was not appealing.

or did the company rise from the ashes to continue selling the ADC, while continuing to ignore emails?

Last edited by qusp; 30th January 2013 at 12:58 PM.
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Old 30th January 2013, 12:58 PM   #29
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Oh when did the company go t*ts up? Ayre does have a habit of stocking up on parts they love.

@Telstar - a similar part from ADI does have a ($99) eval board available : AD7691 datasheet and product info | 18-Bit, 1.5 LSB INL, 250 kSPS PulSAR® Differential ADC in MSOP/QFN | Analog to Digital Converters | Analog Devices
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Old 30th January 2013, 01:04 PM   #30
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I havent looked in ages, but just now I did and the website is exactly the same as 2011 including the copyright notice on the site. I find it hard to believe that the company is anything but a shell if it exists at all
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