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AD8218 Fiches technique(PDF) 11 Page - Analog Devices |
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AD8218 Fiches technique(HTML) 11 Page - Analog Devices |
11 / 16 page Data Sheet AD8218 Rev. B | Page 11 of 16 APPLICATION NOTES SUPPLY (VS) CONNECTIONS The AD8218 includes an internal LDO, which allows the user to leave the VS pin floating, powering the AD8218 directly from the voltage present at Pin 1 (+IN), provided this voltage is in the 4 V to 80 V range. A typical connection for the part in this configuration is shown in Figure 29. +IN ILOAD VS SHUNT GND –IN REF LOAD 4V TO 80V 2.5V BATTERY AD8218 OUT ICHARGE ENB Figure 29. Operation with No VS Connection The AD8218 can also be powered from a separate low impedance supply at Pin 2 (VS); however, this voltage can only be in the 4 V to 5.5 V range. In cases where the high voltage bus is susceptible to noise, transients, or high voltage fluctuations and a 5 V supply is available, the AD8218 can be used in the mode depicted in Figure 30. +IN ILOAD VS SHUNT GND –IN REF LOAD 4V TO 80V BATTERY AD8218 OUT ICHARGE ENB 5V 2.5V CF Figure 30. 5 V Supply Operation ENABLE PIN (ENB) OPERATION The AD8218 includes an internal reference that can be enabled by connecting Pin 3 (ENB) to ground. This mode of operation is shown in Figure 31. +IN ILOAD VS SHUNT GND –IN REF LOAD 4V TO 80V BATTERY AD8218 OUT ENB Figure 31. Enabling the Internal 80 mV Reference In this configuration, the internal 80 mV reference is activated, and the output of the AD8218 is 80 mV when the differential input voltage is 0 V and the voltage at Pin 7 (REF) is also 0 V. This internal reference is useful in unidirectional current measurements where the current being monitored has a very wide range. Setting the output starting point to 80 mV means that when the load current through the shunt resistor is 0 A, the output is 80 mV. This ensures that the output errors due to initial offset and the output saturation range of the amplifier are overcome. In this mode, the transfer function of the AD8218 becomes OUT (V) = OUT (V) = (20 × VIN) + 0.08 V If Pin 3 is connected to ground, and therefore the internal reference is enabled, 80 mV must always be added to the transfer function of the AD8218. |
Numéro de pièce similaire - AD8218_13 |
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Description similaire - AD8218_13 |
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