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AD8216 Datasheet(PDF) 10 Page - Analog Devices |
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AD8216 Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page AD8216 Rev. 0 | Page 10 of 16 THEORY OF OPERATION The AD8216 is a single-supply difference amplifier typically used to accurately amplify a small differential current shunt voltage in the presence of a rapidly changing common-mode voltage. The AD8216 consists of an amplifier (A1), a resistor network, a small voltage reference, and a bias circuit (not shown), see Figure 23. The set of input attenuators preceding A1 consist of RA, RB, and R B C , which feature a combined series resistance of approximately 200 kΩ ± 20%. The purpose of these resistors is to attenuate the input voltage to match the input voltage range of A1. This balanced resistor network attenuates the common-mode signal by a ratio of 1/18. A1 amplifier inputs are held within the power supply range, even if Pin 1 and Pin 8 exceed the supply or fall below common (ground). A reference voltage of 250 mV biases the attenuator above ground, which allows the amplifier to operate in the presence of negative common-mode voltages. The input resistor network also attenuates normal (differential) mode voltages. Therefore, Amplifier A1 features a gain of 54 V/V to provide a total system gain of 3V/V. Total Gain (V/V) = 1/18 (V/V) × 54 (V/V) = 3 V/V The reference inputs, VREF1 and VREF2, are tied through resistors to the positive input of A1, 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 they are used to divide the supply, the gain is 0.5 V/V. The ratios of RA, RB, R B C , and RF are trimmed to a high level of precision to allow the CMRR to exceed 80 dB. This performance is accomplished by laser trimming the resistor ratio matching to better than 0.01%. AD8216 +IN –IN 250mV GND A1 RA RA RB RB RF RC RC VOUT RREF RREF VREF1 VREF2 Figure 23. Simplified Schematic |
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