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Have you examined the code-spread caused by external noise sources that couple dafasheet your sensor, or into your wiring between sensor and ADC, or into your ADC IC?
TS 78L03 CX: Voltage regulator, + V, A, SOT23 at reichelt elektronik
Your reported voltage will only be as accurate as the VDD. The Varef pin has high impedance when the converter is not operating, however it draws 30pC typically per conversion.
78L03 Datasheet PDF –
TS 78L03 CX
Page 38 of datasheet shows a VREF pin. You could use the supply voltage however that is usually a pretty crude and noisy reference source. If you want tighter tolerance than the 0. ADC just survives with datashset ref.
Remember to filter and decouple with a RC circuit if you do not have a separate Vref regulator such as the 78L Sign up using Facebook. You can go as low as 1. I see no mention of internal reference in the Table of Contents. I found the equations to calculate the result.
78L03 – Three-Terminal Voltage Regulator
This is a link to the data sheet and a pic of the ADC operation conditions. Even an inexpensive TL will be okay at maximum conversion rate. Tie that to VDD. Some sensors are ratio-metric and thus tolerate variations in VREF. I will connect a voltage divider to the input of the ADC to measure the voltage. There is a paper discussing this, for a thermistor of Kohm; check on robustcircuitdesign.
AngeloQ 1, 1 5 Sign up using Email and Password. Home Questions Tags Users Unanswered.