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INA211 Datasheet(PDF) 8 Page - Texas Instruments |
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INA211 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 17 page APPLICATION INFORMATION BASIC CONNECTIONS UNIDIRECTIONAL OPERATION INA21x 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 BIDIRECTIONAL OPERATION POWER SUPPLY SELECTING RS INA210 ,, INA211 INA212, INA213 INA214 SBOS437 – MAY 2008 ....................................................................................................................................................................................................... www.ti.com Alternatively, there are applications that must measure current over a wide dynamic range that can take advantage of the low offset on the low end of the Figure 23 shows the basic connections of the measurement. Most often, these applications can use INA210-INA214. The input pins, IN+ and IN–, should the lower gain INA213 or INA214 to accommodate be connected as closely as possible to the shunt larger shunt drops on the upper-end of the scale. For resistor to minimize any resistance in series with the instance, an INA213 operating on a 3.3V supply shunt resistance. could easily handle a full-scale shunt drop of 60mV, with only 60 µV of offset. Unidirectional operation allows the INA210-INA214 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 the linear range for zero inputs. A less frequent case of unipolar output biasing is to bias the output by connecting the REF pin to the supply; in this case, the quiescent output for zero Figure 23. Typical Application input is at quiescent supply. This configuration would only respond to negative currents (inverted voltage polarity at the device input). Power-supply bypass capacitors are required for stability. Applications with noisy or high impedance power supplies may require additional decoupling capacitors to reject power-supply noise. Connect Bidirectional operation allows the INA210-INA214 to bypass capacitors close to the device pins. measure currents through a resistive shunt in two directions. In this case, the output can be set anywhere within the limits of what the reference inputs allow (that is, between 0V to V+). Typically, it The input circuitry of the INA210-INA214 can is set at half-scale for equal range in both directions. accurately measure beyond its power-supply voltage, In some cases, however, it is set at a voltage other V+. For example, the V+ power supply can be 5V, than half-scale when the bidirectional current is whereas the load power supply voltage can be as nonsymmetrical. high as +26V. However, the output voltage range of the OUT terminal is limited by the voltages on the The quiescent output voltage is set by applying power-supply pin. Note also that the INA210-INA214 voltage to the reference input. Under zero differential can withstand the full –0.3V to +26V in the input pins, input conditions the output assumes the same voltage regardless of whether the device has power applied as is applied to the reference input. or not. The zero-drift offset performance of the INA210-INA214 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. The INA210-INA214 series gives equivalent accuracy at a full-scale range on the order of 10mV. This accuracy reduces shunt dissipation by an order of magnitude with many additional benefits. 8 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): INA210 INA211 INA212 INA213 INA214 |
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