For a project, I need a 500mV reference.

Some requirements:

  1. Relatively low cost.
  2. Small size. Preferably surface mount.
  3. Supply from 4.8V to 25V.
  4. Accuracy ±5% or better
  5. Stable over voltage (that is, it doesn't change that much with a different supply.)

I could use a diode drop but it does not satisfy condition 5, being stable over voltage.

Any suggestions appreciated!

  • \$\begingroup\$ I don't mean to be rude, but you seem to know all of the relevant characteristics and have a complete understanding of what you need, so why not go to Digikey or Mouser and use the search feature to drill down and find what you need? There's a whole subcategory for voltage references that I found easily and I used your criteria I came up with the same answer in less than 5 minutes. Doing it this way seems roundabout and slow. \$\endgroup\$ – AngryEE Oct 15 '10 at 19:48
  • 1
    \$\begingroup\$ I just wanted people's opinions on the best way to approach it. I'm still learning. \$\endgroup\$ – Thomas O Oct 15 '10 at 19:51

what about this http://www.analog.com/static/imported-files/Data_Sheets/ADR130.pdf cheap from digikey circa $2 for single units, wide input voltage range (2-18 V) stable output over temperature a wide temperature range of 50 ppm per degree C, and +/- 0.7% initial accuracy, and small size TSOT package.

Use a voltage divider on the input side to drop your 4.8 V - 25 V to 2.4 to 12.5V which is suitable.

I think that is a tick in every box :)


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