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78L03 DATASHEET PDF

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78L03 Datasheet PDF

Some sensors are ratio-metric and thus tolerate variations in VREF. Page 38 of datasheet shows a VREF pin. Tie that to VDD. Even an inexpensive TL will be okay at maximum conversion rate.

I will connect a voltage divider to the input of the ADC to measure the voltage. Bridges, such as strain gauges, are one such sensor.

If you want tighter tolerance than the 0. Your reported voltage will only datasheey as accurate as the VDD. I see no mention of internal reference in the Table of Contents.

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Remember to filter and decouple with a RC circuit if you do not have a separate Datashset regulator such as the 78L Post as a guest Name. This is a link to 78ll03 data sheet and a pic of the ADC operation conditions. You could use the supply voltage however that is usually a pretty crude and noisy reference source. Sign up using Email and Password. AngeloQ 1, 1 5 There is a paper discussing this, for a thermistor of Kohm; check on robustcircuitdesign. You must provide the reference voltage, which will directly affect the accuracy of your ADC.

I went through another document which was 18MB and found no Vref. I found the equations to calculate the result.

A reasonable choice would be an external 2. You can go as low as 1. Spehro Pefhany k 4 Home Questions Tags Users Unanswered. Email Required, but never shown. By using our site, you acknowledge that you have read and understand our Cookie PolicyVatasheet Policyand our Terms of Service.

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78L03 Datasheet catalog

Sign up using Facebook. 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 or log in Sign up using Google. 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? ADC just survives with external ref. Datashfet 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.