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AD8211WYRJZ-RL Folha de dados(PDF) 11 Page - Analog Devices |
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AD8211WYRJZ-RL Folha de dados(HTML) 11 Page - Analog Devices |
11 / 16 page AD8211 Rev. A | Page 11 of 16 APPLICATION NOTES OUTPUT LINEARITY In all current sensing applications, and especially in automotive and industrial environments where the common-mode voltage can vary significantly, it is important that the current sensor maintain the specified output linearity, regardless of the input differential or common-mode voltage. The AD8211 contains specific circuitry on the input stage, which ensures that even when the differential input voltage is very small, and the common-mode voltage is also low (below the 5 V supply), the input-to-output linearity is maintained. Figure 24 shows the input differential voltage vs. the corresponding output voltage at different common modes. 200 0 0 DIFFERENTIAL INPUT VOLTAGE (mV) 10 180 160 140 120 100 80 60 40 20 1 2 3 4 5 6 7 8 9 IDEAL VOUT (mV) VOUT (mV) @ VCM = 0V VOUT (mV) @ VCM = 65V Figure 24. Gain Linearity Due to Differential and Common-Mode Voltage Regardless of the common mode, the AD8211 provides a correct output voltage when the input differential is at least 2 mV, which is due to the voltage range of the output amplifier that can go as low as 33 mV typical. The specified minimum output amplifier voltage is 100 mV to provide sufficient guard- bands. The ability of the AD8211 to work with very small differential inputs, regardless of the common-mode voltage, allows for more dynamic range, accuracy, and flexibility in any current sensing application. |
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