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Looking for < $5 daisy-chainable ADC

Discussion in 'Datasheets, Manuals and Component Identification' started by Daniel Zetterman, Jan 15, 2016.

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  1. Daniel Zetterman

    Daniel Zetterman

    21
    1
    Dec 9, 2014
    Does anyone know of a ADC that meets below specs?

    * Daisy-chainable
    * SPI
    * 8 bit
    * >= 100 ks/S
    * 8 channels
    * Single-ended
    * Cost less than $5
     
    Last edited: Jan 15, 2016
  2. dorke

    dorke

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    Jun 20, 2015
    You left out the most important parameter :(
    What is the resolution you need?
     
  3. Daniel Zetterman

    Daniel Zetterman

    21
    1
    Dec 9, 2014
    Sorry for that, its 8-bit :)
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    when you say "daisy chainable", do you mean that multiple can be connected to the same spi bus?
     
  5. Daniel Zetterman

    Daniel Zetterman

    21
    1
    Dec 9, 2014
    Yes, so that both the config bits can be transferred to all the ADC:s in the chain, and data bits can be clocked back to the SPI master from all ADC:s.

    Like this: http://www.ti.com/lit/an/slaa296/slaa296.pdf

    But with a cheaper ADC :)
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    ah, I see. It looks like it would require a fair amount more logic on the chip as well as more pins.

    I'm not surprised the chip implementing it is not cheap.

    but knowing exactly what you want may help people in the know help you.
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    googling revealed several alternatives, but the cost (even in quantity) of the ones I checked were well above your price point.
     
  8. Daniel Zetterman

    Daniel Zetterman

    21
    1
    Dec 9, 2014
    Hmm, I will have a look if I can throw in a SPI controlled MUX to select the correct ADC.
    So much for elegant modular solutions :p
     
  9. dorke

    dorke

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    Jun 20, 2015
    Is I2C an option?
    Can make life easier with multiple devices.
     
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