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INA199A2RSWR Datasheet(PDF) 9 Page - Texas Instruments |
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INA199A2RSWR Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 22 page  INA199Ax V+ OUT GND IN- IN+ C BYPASS 0.01mF to 0.1mF +2.7Vto+26V REF Reference Voltage Supply Load R SHUNT Output R 1 R 3 R 2 R 4 INA199A1 INA199A2 INA199A3 www.ti.com SBOS469B – MAY 2009 – REVISED FEBRUARY 2010 APPLICATION INFORMATION The INA199Ax series of current-shunt monitors give BASIC CONNECTIONS equivalent accuracy at a full-scale range on the order of 10mV. This accuracy reduces shunt dissipation by Figure 20 shows the basic connections for the an order of magnitude with many additional benefits. INA199Ax. The input pins, IN+ and IN–, should be connected as closely as possible to the shunt resistor Alternatively, there are applications that must to minimize any resistance in series with the shunt measure current over a wide dynamic range that can resistance. take advantage of the low offset on the low end of the measurement. Most often, these applications can use the lower gain INA199A1 or INA199A2 to accommodate larger shunt drops on the upper end of the scale. For instance, an INA199A1 operating on a 3.3V supply could easily handle a full-scale shunt drop of 60mV, with only 150mV of offset. UNIDIRECTIONAL OPERATION Unidirectional operation allows the INA199Ax to measure currents through a resistive shunt in one direction. The most frequent case of unidirectional operation sets the output at ground by connecting the REF pin to ground. In unidirectional applications where the highest possible accuracy is desirable at very low inputs, bias the REF pin to a convenient value above 50mV to get the device output swing into Figure 20. Typical Application the linear range for zero inputs. A less frequent case of unipolar output biasing is to Power-supply bypass capacitors are required for bias the output by connecting the REF pin to the stability. Applications with noisy or high-impedance supply; in this case, the quiescent output for zero power supplies may require additional decoupling input is at quiescent supply. This configuration would capacitors to reject power-supply noise. Connect only respond to negative currents (inverted voltage bypass capacitors close to the device pins. polarity at the device input). On the RSW package, two pins are provided for each input. These pins should be tied together (that is, tie BIDIRECTIONAL OPERATION IN+ to IN+ and tie IN– to IN–). Bidirectional operation allows the INA199Ax to measure currents through a resistive shunt in two POWER SUPPLY directions. In this case, the output can be set The input circuitry of the INA199Ax can accurately anywhere within the limits of what the reference measure beyond its power-supply voltage, V+. For inputs allow (that is, between 0V to V+). Typically, it example, the V+ power supply can be 5V, whereas is set at half-scale for equal range in both directions. the load power-supply voltage can be as high as In some cases, however, it is set at a voltage other +26V. However, the output voltage range of the OUT than half-scale when the bidirectional current is terminal is limited by the voltages on the nonsymmetrical. power-supply pin. Note also that the INA199Ax can The quiescent output voltage is set by applying withstand the full –0.3V to +26V range in the input voltage to the reference input. Under zero differential pins, regardless of whether the device has power input conditions the output assumes the same voltage applied or not. that is applied to the reference input. SELECTING RS The zero-drift offset performance of the INA199Ax offers several benefits. Most often, the primary advantage of the low offset characteristic enables lower full-scale drops across the shunt. For example, non-zero-drift current shunt monitors typically require a full-scale range of 100mV. Copyright © 2009–2010, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): INA199A1 INA199A2 INA199A3 |
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