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INA216A4 Datasheet(PDF) 10 Page - Texas Instruments |
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INA216A4 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 18 page  Error_V = OS ? 100 V V OS SENSE INA216 SBOS503B – JUNE 2010 – REVISED JUNE 2010 www.ti.com These comments have framed the decision on what Calculating Total Error the shunt resistor value should be, based on the The electrical specifications for the INA216 include full-scale value; but many applications require the typical individual errors terms such as gain error, accurate measurements at levels as low as 10% of offset error, and nonlinearity error. Total error the full-scale value. At this level, the input offset including all of these individual error components is voltage of the current shunt monitor becomes a larger not specified in the Electrical Characteristics table. To percentage of the shunt voltage, and thus contributes accurately calculate the error that can be expected a larger error to the output. The percentage of error from the device, we must first know the operating created by the input offset voltage relative to the conditions to which the device is subjected. Some shunt voltage is shown in Equation 1. current shunt monitors specify a total error in the product data sheet. However, this total error term is accurate under only one particular set of operating (1) conditions. Specifying the total error at this one point Ideally, the differential input voltage at 10% would be has little practical value, though, because any increased to minimize the effects of the input offset deviation from these specific operating conditions no voltage; however, we are bound by the full-scale longer yields the same total error value. This section value. The full-scale output voltage on the INA216 is discusses the individual error sources, with limited to 200mV below the supply voltage (IN+). information on how to apply them in order to calculate Selecting a shunt resistor to increase the shunt the total error value for the device under normal voltage at the low operating range of the load current operating conditions. could easily saturate the output of the current shunt The typical error sources that have the largest impact monitor at the full-scale load current. For applications on the total error of the device are input offset where accuracy over a larger range is needed, a voltage, common-mode voltage rejection, gain error, lower gain option (and therefore, a larger differential and nonlinearity error. input voltage) is selected. For applications where a minimal voltage drop on the line that powers the load The nonlinearity error of the INA216 is relatively low is required, a higher gain option (and so, a smaller compared to the gain error specification, which differential input voltage) is selected. results in a gain error that can be expected to be relatively constant throughout the linear input range of For example, consider a design that requires a the device. While the gain error remains constant full-scale output voltage of 4V, a maximum load across the linear input range of the device, the error current of 10A, and a maximum voltage drop on the associated with the input offset voltage does not. As common-mode line of 25mV. The 25mV maximum the differential input voltage developed across a voltage drop requirement and a 4V full-scale output shunt resistor at the input of the INA216 decreases, limits the gain option to the 200V/V device. A 100V/V the inherent input offset voltage of the device setting would require a maximum voltage drop of becomes a larger percentage of the measured input 40mV with the other two lower gain versions creating signal, resulting in an increase in measurement error. larger voltage drops. Based on the gain of 200 on a This varying error is present among all current shunt 4V full-scale output, the maximum differential input monitors, given the input offset voltage ratio to the voltage would be 20mV. The shunt resistor needed to voltage being sensed by the device. The low input create a 20mV drop with a 10A load current is 2m Ω. offset voltages present in the INA216 devices, When choosing the proper shunt resistor, it is also however, limit the amount of contribution the offset important to consider that at higher currents, the voltage has on the total error term. power dissipation in the shunt resistor becomes Two examples are provided that detail how different greater. Therefore, it is important to evaluate the drift operating conditions can affect the total error of the sense resistor as a result of power dissipation, calculations. Typical and maximum calculations are and choose an appropriate resistor based on its shown as well to provide the user more information power wattage rating. on how much error variance could be present from device to device. 10 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): INA216 |
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