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Spehro Pefhany k 4 There is a paper discussing this, for a thermistor of Kohm; check on robustcircuitdesign.

78L03 datasheet, 78L03 datasheets, manuals for 78L03 electornic semiconductor part

Your reported voltage will only be as accurate as the VDD. Sign up using Email and Password.

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 78k03 website is subject to these policies. Page 38 of datasheet shows a VREF pin. Sign up or log in Sign up using Google. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


I found the equations to calculate the result. Some sensors are ratio-metric and thus tolerate variations in VREF. Post as a guest Name.

You must provide the reference voltage, which will directly affect the accuracy of your ADC. Even an inexpensive TL 78k03 be okay at maximum conversion rate.

78L03 – Three-Terminal Voltage Regulator

ADC just survives with external ref. You could use the supply 7l803 however that is usually a pretty crude and noisy reference source.

A reasonable choice would be an external 2. I will connect a voltage divider to the input of the ADC to measure the voltage.

If you want tighter tolerance than the 0. 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? I see no mention of internal reference in the Table of Datasheet. Bridges, such as strain gauges, are one such sensor.


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Email Required, but never shown. This is a link to the data sheet and a pic of the ADC operation conditions. AngeloQ 1, 1 5 Remember to filter and decouple with a RC circuit if you do not have a separate Vref regulator such as the 78L You can go as low as 1.

Home Questions Tags Users Unanswered. The Varef pin has high impedance when the converter is not operating, however it draws 30pC typically per conversion. 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 went through another document which was 18MB and found no Vref.

Tie that to VDD. Sign up using Facebook.