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AD8211YRJZ-R2 Datenblatt(PDF) 10 Page - Analog Devices |
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AD8211YRJZ-R2 Datenblatt(HTML) 10 Page - Analog Devices |
10 / 16 page AD8211 Rev. A | Page 10 of 16 THEORY OF OPERATION In typical applications, the AD8211 amplifies a small differential input voltage generated by the load current flowing through a shunt resistor. The AD8211 rejects high common-mode voltages (up to 65 V) and provides a ground-referenced, buffered output that interfaces with an analog-to-digital converter (ADC). Figure 23 shows a simplified schematic of the AD8211. V+ VOUT = (ISHUNT × RSHUNT) × 20 G = +20 AD8211 A1 PROPRIETARY OFFSET CIRCUITRY GND R1 ROUT Q1 R ISHUNT IIN RSHUNT Figure 23. Simplified Schematic A load current flowing through the external shunt resistor produces a voltage at the input terminals of the AD8211. The input terminals are connected to Amplifier A1 by Resistor R and Resistor R1. The inverting terminal, which has very high input impedance is held to (VCM) − (ISHUNT × RSHUNT) because negligible current flows through Resistor R. Amplifier A1 forces the noninverting input to the same potential. Therefore, the current that flows through Resistor R1, is equal to IIN = (ISHUNT × RSHUNT)/R1 This current (IIN) is converted back to a voltage via ROUT. The output buffer amplifier has a gain of 20 V/V and offers excellent accuracy as the internal gain setting resistors are precision trimmed to within 0.01% matching. The resulting output voltage is equal to VOUT = (ISHUNT × RSHUNT) × 20 |
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