78L03 DATASHEET PDF

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Page 38 of datasheet shows a VREF pin.

78L03 Datasheet catalog

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?

Home Questions Tags Users Unanswered. Sign up or log in Sign up using Google. Spehro Pefhany k 4 Tie that to VDD. Some sensors are ratio-metric and thus tolerate variations in VREF.

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. There is a paper discussing this, for a thermistor of Kohm; check on robustcircuitdesign. Remember to filter and decouple with a RC circuit if you do not have a separate Vref regulator such as the 78L Email Required, but never shown.

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I see no mention of internal reference in the Table of Contents. I will connect a voltage divider to the input of the ADC to measure the voltage. The Varef pin has high impedance when the converter is not operating, however it draws 30pC typically per conversion. 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.

Sign up using Facebook. If you want tighter tolerance than the 0. ADC just survives with external ref. You must provide the reference voltage, which will directly affect the accuracy of your ADC. A reasonable choice would be an external 2.

I went through another document which was 18MB and found no Vref. Bridges, such as strain gauges, are one such sensor. This is a link to the data sheet and a pic of the ADC operation conditions. AngeloQ 1, 1 5 Sign up using Email and Password.

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Post as a guest Name. You can go as low as 1. You could use the supply voltage however that is usually a pretty crude and noisy reference source. Even an inexpensive TL will be okay at maximum conversion rate.

78L03 – Three-Terminal Voltage Regulator

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. Your reported voltage will only be as accurate as the VDD.