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better 5 volt regualtion — Parallax Forums

better 5 volt regualtion

PorterPorter Posts: 9
edited 2004-10-14 16:04 in BASIC Stamp
I'm trying to use the·ltc1286 (12 bit adc) to measure a voltage.· On my custom board with a 7805 regulator the output voltage is·7.07vdc.· This is throwing my reading off·some.· Is there a better regulation system i can use for this project.· In total I'm talking about >200 units so calibrating each·board or adc values it not practical.

Open to suggestions
Thanks in advance····

Comments

  • PorterPorter Posts: 9
    edited 2004-10-03 15:25
    Mistake that was 5.07vdc
  • WorapohtWorapoht Posts: 17
    edited 2004-10-03 15:52
    you may added 5.0 V. voltage reference from LM4040-5.0 to Vref. (pin 1)

    If your input didn't over 4.096V. I'd recommend you added LM4040-4.1, 4.096V. reference voltage to Vref.
    then made Vref < Vdd ensure valid data entired ranged 0 to Vref (more reliable).
    and you also get true 1 bit/1mv. resolution.
  • lrjoycelrjoyce Posts: 2
    edited 2004-10-14 16:04
    I normally use a REF02AP Voltage reference from Burr Brown. I can connect it per the data sheet and dial in as close to 5 volts as I need. If you needed more current, you could use an adjustable regulator from National Semiconductor. Hope this helps.
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