ina125 collegamenti

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salve tutti, ho trovato per internet uno schema per amplificare un segnale proveniente da una cella di carico che utilizza un ina 125 e piedini 5 e 14 sono collegati fra di loro. praticamente da quanto ho capito invece che collegare il - dello stadio differenziale massa è collegato ad 2.5 vref. perchè? cosa serve? grazie mille

serve ad avere lo "zero" 2.5v: molto utile quando connetti l'uscita dell'ina125 ad un ingresso analogico di arduino.


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