ADval*/Quanta Question

[Darrel Taylor]

Take VDD divided by the MAX A/D reading, and multiply times 256.

5 / 1023 * 256 = 1.251

Scale that up to however many decimal places you want.
For 3 decimal places, multiply by 1000.

= 1251

So your current number is correct for 10-bit A/D with 3 decimals. (0-4999)

If you only want 2 decimals as indicated in your post, use 125 instead. (0-499)
Or you can calculate to 3 decimals, then add 5 and divide by 10 and you'll get a rounded number. (0-500)

4999 + 5 = 5004, /10 = 500
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