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I went through another document which was 18MB and found no Vref. Have you examined the code-spread caused by external noise sources that couple into your sensor, or into your wiring between sensor and ADC, or into your ADC IC?

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Email Required, but never shown. You must provide the reference voltage, which will directly affect the accuracy of your ADC.

Even an inexpensive TL will be okay at maximum conversion rate. Home Questions Tags Users Unanswered.


Remember to filter and decouple with a RC circuit if you do not have a separate Vref regulator such as the 78L By clicking “Post Your Answer”, you xatasheet that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is 78o03 to these policies.

You could use the supply voltage however that is usually a pretty crude and noisy reference source. AngeloQ 1, 1 5 This is a link to the data sheet and a pic of the ADC operation conditions. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

78L03 Datasheet PDF

If you want tighter tolerance than the 0. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

I found the equations to calculate the result. Page 38 of datasheet shows a VREF pin. Some sensors are ratio-metric and thus tolerate variations in VREF. Your reported voltage will only be as accurate as the VDD. I will connect a voltage divider to the input of the ADC to measure the voltage. A reasonable choice would be an external 2. I see no mention of internal reference in the Table of Contents.


Sign up using Facebook. You can go as low as 1. The Varef pin has high impedance when the converter is not operating, however it draws 30pC typically per conversion.

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Sign up or log in Sign up using Google. ADC just survives with external ref. Sign up using Email and Datasneet. Spehro Pefhany k 4 There is a paper discussing this, for a thermistor of Kohm; check on robustcircuitdesign. Tie that to VDD. Bridges, such as strain gauges, are one such sensor.

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