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4 channel simultaneously sampling A/D converter.

Jan Minck
Prodigy 30 points
Other Parts Discussed in Thread: OMAP-L138, ADS1174, ADS1274

I am looking for a 4 channel 16 bit A/D converter for a audio beam forming application.
What is of paramount importance is that the 4 channels are sampled at exactly the same time.
It could have 4 individual A/D converters or only one but with 4 sample and hold circuits.
In last case the A/D converter has to 4x faster to read out all 4 channels before the next batch of 4 samples become available.
The audio will be CD quality i.e. 44k samples per second at each channel.
The A/D converter will have to have a compatible serial interface be connected to a Ti OMAP-L138 signal processor.
Question:  Which A/D part to use.
Now I have your attention, would you recommend a newer DSP, possibly with 4 DSP cores. In my application I have to do a fast 1024 sample FFT on each channel, allocating a core to each channel.
Thanks for your advice.
Cheers,
Jan

  • 0
    TI__Guru* 97585 points
    Jan,


    I don't support this device, but it seems that the ADS1174/ADS1274 might be close to what you need for your application. You should read through the datasheet. It does have some latency and a frequency response that may or may not be suitable for your application.

    As for a DSP recommendation, I'd post in one of the forums that support DSPs. I don't know enough about that topic to give you a recommendation.


    Joseph Wu
  • 0 in reply to Joseph Wu
    Prodigy 30 points

    Thanks Jo,

    I looked at the parts and from first glance they seem to fit the bill. I have to make a prototype (or maybe there is a demo board) and try it out to see if it does what I want.

    Thanks for your time to reply,

    Cheers,

    Jan

  • 0 in reply to Jan Minck
    TI__Guru* 97585 points
    Jan,


    The ADS1174 and ADS1274 do have evaluation modules. There is a motherboard that connects to your computer through USB and a daughter board with the device. I would note that the EVM was designed when XP was the dominant version of Windows. It should work with Windows 7, and some have used it with Windows 8 and 10, but it will require more work to set it up.

    If you are interested, the ADS1274EVM user guide is worth the download to look at the schematic.


    Joseph Wu