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AD8417WBRMZ-RL 数据表(PDF) 10 Page - Analog Devices |
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AD8417WBRMZ-RL 数据表(HTML) 10 Page - Analog Devices |
10 / 16 page AD8417 Data Sheet THEORY OF OPERATION The AD8417 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 AD8417 measures current by amplifying the voltage across a shunt resistor connected to its inputs by a gain of 60 V/V (see Figure 26). The AD8417 design provides excellent common-mode rejection, even with PWM common-mode inputs that can change at very fast rates, for example, 1 V/ns. The AD8417 contains patented technology to eliminate the negative effects of such fast changing external common-mode variations. The AD8417 features an input offset drift of less than 0.4 µV/°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 AD8417 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 AD8417 to deliver total accuracy for these demanding applications. + ISHUNT G = 60 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 AD8417 VS +IN –IN – GND –50A 50A RSHUNT Figure 26. Typical Application Rev. 0 | Page 10 of 16 |
类似零件编号 - AD8417WBRMZ-RL |
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类似说明 - AD8417WBRMZ-RL |
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