Timeline for Inaccurate BandGap measurement
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 4, 2015 at 17:59 | comment | added | WhatRoughBeast | @sas - Spehro is referring to the AT2560 data sheet atmel.com/images/doc2549.pdf Note that section 26.1 gives the absolute accuracy of the ADC as 2-4 lsbs. Important lesson here - resolution is not accuracy. | |
| Apr 4, 2015 at 16:52 | comment | added | sas | First of all, as I've mentioned, the supply voltage was measured with a multimeter on the 5V pin to be exactly 5V (up to the accuracy of the multimeter). This measurement gave good results when measuring other external voltage sources with the ADC. Secondly, the datasheet only specifies an error of +-0.5LSB, how do you come up with 2-4LSB? Averaging might help in certain cases - depending on the characteristics of the added noise to the input signal. | |
| Apr 4, 2015 at 16:45 | history | edited | Spehro 'speff' Pefhany | CC BY-SA 3.0 |
added 201 characters in body
|
| Apr 4, 2015 at 16:34 | history | answered | Spehro 'speff' Pefhany | CC BY-SA 3.0 |