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Using the TC7109CPL 40 pin ADC??? with Stamp or Prop — Parallax Forums

Using the TC7109CPL 40 pin ADC??? with Stamp or Prop

mikedivmikediv Posts: 825
edited 2009-08-10 00:02 in General Discussion
Hey guys I just got a bunch well 4 of the TC7109CPL ADC chips I found the data sheet but I was wondering in anyone has used them with the basic stamp or prop chip I was wondering if I could use this chip to read an analog signal an FM radio signal
and convert it to a digital input that the stamp or prop could use?

Comments

  • Peter JakackiPeter Jakacki Posts: 10,193
    edited 2009-08-10 00:02
    My advice is to bin them. They are massive monsters that would take up all your I/O to interface to and then spit out a measly 30 samples per second max. At that rate it won't even pick up low-frequency hum.

    It's actually cheaper and smaller to make up your own ADC on the prop using an RC DAC and a voltage reference plus a comparator then use successive approximation. Not that I would bother doing it this way either, but if it's because it's cheap then this would be the way to do it for a "DC" ADC.

    When it comes to digitizing audio signals though the Prop has a great trick using one resistor and 2 caps, so why bother with a behemoth?

    *Peter*
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