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delta sigma dac

Discussion in 'Electronic Design' started by [email protected], Jan 5, 2009.

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  1. Guest

    Hi,

    I am trying to build a delta-sigma dac using the outputs of an
    fpga. I need about 30mhz bandwidth and 8-10 bits. I was going to use
    an 8-bit r-2r ladder, but the i/o requirements are huge since i need
    16 channels. The maximum output rate of the fpga pins is about 300mhz
    which is far to slow to get 8-10 [email protected] If i use a dac larger
    than 1-bit could this work. Eg a 4-bit r-2r used in a delta sigma.
    Does anyone have the equations for frequency/amount of quantization/
    output bandwidth?

    Thanks,

    Jon Pry
     
  2. JosephKK

    JosephKK Guest

    Classically, 8 to 10 x oversampling will get you 3 additional bits
    resolution. CVSD (delta-sigma converters) gives better dynamic range
    at lower resolution for the same bit rate. With 16 channels out,
    perhaps dedicated DAC chips would be best.
     
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