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Nick Gray

 

Nicholas Gray

Nicholas has worked in the Semiconductor industry for over 30 years and has authored a number of published articles about data converters (ADCs and DACs) and signal integrity issues.

 

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  • I've been wondering if there are "semi-smart" DACs in the audio frequency range?

    What I had in mind was something like a modern uart; 64bytes of FIFO and a rate

    generator, so you could tell it "convert this stream of digital info to analog at 8k samples

    per second, but only interrrupt me every 5ms so I can fill up the FIFO via some high-speed

    interface, rather than every 125 us (one sample.)

     

    I guess usually this is done by putting a smarter processor on the other side (one with DMA

    capabilities and specialized interfaces like IIS(?)), but I was hoping for something usable

    with simpler microcontrollers.

     

    For that matter, are there any audio-oriented CPU/DAC combos that lie somewhere in

    between an ISD chip and a consumer MP3 device?

     

    Thanks

    Bill W

Reply

  • I've been wondering if there are "semi-smart" DACs in the audio frequency range?

    What I had in mind was something like a modern uart; 64bytes of FIFO and a rate

    generator, so you could tell it "convert this stream of digital info to analog at 8k samples

    per second, but only interrrupt me every 5ms so I can fill up the FIFO via some high-speed

    interface, rather than every 125 us (one sample.)

     

    I guess usually this is done by putting a smarter processor on the other side (one with DMA

    capabilities and specialized interfaces like IIS(?)), but I was hoping for something usable

    with simpler microcontrollers.

     

    For that matter, are there any audio-oriented CPU/DAC combos that lie somewhere in

    between an ISD chip and a consumer MP3 device?

     

    Thanks

    Bill W

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