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TC7126 数据表(PDF) 13 Page - Microchip Technology |
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TC7126 数据表(HTML) 13 Page - Microchip Technology |
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13 / 26 page  © 2006 Microchip Technology Inc. DS21458C-page 13 TC7126/A 6.6 Reference Voltage Selection A full scale reading (2000 counts) requires the input signal be twice the reference voltage. Note: VFS = 2VREF. In some applications, a scale factor other than unity may exist between a transducer output voltage and the required digital reading. Assume, for example, a pressure transducer output for 2000lb/in2 is 400mV. Rather than dividing the input voltage by two, the reference voltage should be set to 200mV. This permits the transducer input to be used directly. The differential reference can also be used where a digital zero reading is required when VIN is not equal to zero. This is common in temperature measuring instru- mentation. A compensating offset voltage can be applied between analog common and VIN-. The trans- ducer output is connected between VIN+ and analog common. Required Full Scale Voltage* VREF 20mV 100mV 2V 1V |
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