ADC recomendation

Comments

• Javalin Posts: 892

  2014-01-02 05:20 edited 2014-01-02 05:20

  scratch that - just found one. (finally!)
• photomankc Posts: 943

  2014-01-02 05:45 edited 2014-01-02 05:45

  What part did you settle on?
• Javalin Posts: 892

  2014-01-02 05:49 edited 2014-01-02 05:49

  Actually once I'd written it out the issue, I realized that (a) the MCP3208 has enough resolution (5/4096 = 0.001v per bit) so increasing to 0-10v on 12bits wouldn't help (10/8192 = 0.002v per bit), and (b) I think the accuracy of the system is lost elsewhere.
  
  Additionally I'd probably lose a fair bit of resolution with 14bit/16bit due to noise.
• LoopyByteloose Posts: 12,537

  2014-01-02 08:54 edited 2014-01-02 08:54

  Yes, the MCP3208 makes it all very easy with the Propeller's 3.3 volt.
  
  I just finished a build for the ADC8032 which requires 5.0 power and is only 8 bits. I had to add three 2N700 level shifters to get it all working -- lots of extra work. I only did so because I had the chip here.
• frank freedman Posts: 1,983

  2014-01-02 09:46 edited 2014-01-02 09:46

  Javalin wrote: »

  Actually once I'd written it out the issue, I realized that (a) the MCP3208 has enough resolution (5/4096 = 0.001v per bit) so increasing to 0-10v on 12bits wouldn't help (10/8192 = 0.002v per bit), and (b) I think the accuracy of the system is lost elsewhere.
  
  Additionally I'd probably lose a fair bit of resolution with 14bit/16bit due to noise.

  
  Google Bonnie Baker and ADC; will return a pile of good stuff.
  
  FF
• Javalin Posts: 892

  2014-01-03 01:08 edited 2014-01-03 01:08

  so it does. thanks for that.
  
  http://www.planetanalog.com/document.asp?doc_id=528347&site=planetanalog