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AD8418WBRZ-RL Arkusz danych(PDF) 10 Page - Analog Devices |
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AD8418WBRZ-RL Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 16 page AD8418 Data Sheet THEORY OF OPERATION The AD8418 is a single-supply, zero drift, difference amplifier that uses a unique architecture to accurately amplify small differential current shunt voltages in the presence of rapidly changing common-mode voltages. In typical applications, the AD8418 is used to measure current by amplifying the voltage across a shunt resistor connected to its inputs by a gain of 20 V/V (see Figure 26). The AD8418 is designed to provide excellent common-mode rejection, even with PWM common-mode inputs that can change at very fast rates, for example, 1 V/ns. The AD8418 contains patented technology to eliminate the negative effects of such fast changing external common-mode variations. The AD8418 features an input offset drift of less than 500 nV/°C. This performance is achieved through a novel zero drift architecture that does not compromise bandwidth, which is typically rated at 250 kHz. The reference inputs, VREF1 and VREF2, are tied through 100 kΩ resistors to the positive input of the main amplifier, which allows the output offset to be adjusted anywhere in the output operating range. The gain is 1 V/V from the reference pins to the output when the reference pins are used in parallel. When the pins are used to divide the supply, the gain is 0.5 V/V. The AD8418 offers breakthrough performance without compromising any of the robust application needs typical of solenoid or motor control. The ability to reject PWM input common-mode voltages and the zero drift architecture providing low offset and offset drift allows the AD8418 to deliver total accuracy for these demanding applications. + ISHUNT G = 20 VCM = –2V TO +70V VS = 2.7V TO 5.5V VREF1 VREF2 OUT 0V VS VS/2 VOUT ISHUNT EMI FILTER EMI FILTER VCM 0V 70V AD8418 VS +IN –IN – GND –50A 50A RSHUNT Figure 26. Typical Application Rev. 0 | Page 10 of 16 |
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