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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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AD694 Scheda tecnica(PDF) 12 Page - Analog Devices |
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AD694 Scheda tecnica(HTML) 12 Page - Analog Devices |
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12 / 16 page  AD694 –12– REV. B Figure 15. Low Cost Sensor Transmitter The circuit shown, will convert a positive differential signal at VIN to a 4–20 mA current. The circuit has common-mode range of 3 V to 8 V. The low end of the common-mode range is limited by the AD708’s ability to pull down on RS. A single supply am- plifier could be used instead to extend the common-mode range down to about 1.5 V. As shown, the circuit handles positive differential signals (VIN positive). To handle bipolar differential signals (VIN is positive or negative), the reference pin of the in amp (Point C) must be offset positively from the 2 V reference. For example, discon- necting Point C from the 2 V reference and connecting it to a 3 V source would result in a VA of 1 V (or half scale) for a zero volt differential input from the sensor. |
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