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INA181-Q1 Datasheet(PDF) 19 Page - Texas Instruments |
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INA181-Q1 Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 47 page  Power Supply, VS 2.7 V to 5.5 V VS CBYPASS 0.1 µF Single-Channel TI Device Bus Voltage ±0.2 V to +26 V RSENSE GND Load IN± IN+ OUT REF + ± Output 19 INA181-Q1, INA2181-Q1, INA4181-Q1 www.ti.com SLYS018A – APRIL 2018 – REVISED JULY 2018 INA2181-Q1 INA4181-Q1 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 8.4 Device Functional Modes 8.4.1 Normal Mode The INAx181-Q1 are in normal operation when the following conditions are met: • The power supply voltage (VS) is between 2.7 V and 5.5 V. • The common-mode voltage (VCM) is within the specified range of –0.2 V to +26 V. • The maximum differential input signal times gain plus VREF is less than VS minus the output voltage swing to VS. • The minimum differential input signal times gain plus VREF is greater than the swing to GND (see the Rail-to- Rail Output Swing section). During normal operation, these devices produce an output voltage that is the gained-up representation of the difference voltage from IN+ to IN– plus the reference voltage at VREF. 8.4.2 Unidirectional Mode These devices can be configured to monitor current flowing in one direction (unidirectional) or in both directions (bidirectional) depending on how the REF pin is configured. The most common case is unidirectional where the output is set to ground when no current is flowing by connecting the REF pin to ground, as shown in Figure 44. When the current flows from the bus supply to the load, the input signal across IN+ to IN– increases, and causes the output voltage at the OUT pin to increase. Figure 44. Unidirectional Application The linear range of the output stage is limited by how close the output voltage can approach ground under zero input conditions. In unidirectional applications where measuring very low input currents is desirable, bias the REF pin to a convenient value above 50 mV to get the output into the linear range of the device. To limit common- mode rejection errors, buffer the reference voltage connected to the REF pin. A less-frequently used output biasing method is to connect the REF pin to the power-supply voltage, VS. This method results in the output voltage saturating at 200 mV less than the supply voltage when no differential input signal is present. This method is similar to the output saturated low condition with no input signal when the REF pin is connected to ground. The output voltage in this configuration only responds to negative currents that develop negative differential input voltage relative to the device IN– pin. Under these conditions, when the differential input signal increases negatively, the output voltage moves downward from the saturated supply voltage. The voltage applied to the REF pin must not exceed VS. |
Similar Part No. - INA181-Q1_19 |
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Similar Description - INA181-Q1_19 |
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