INA210AIRSWR datasheet(25/44 Pages) TI1

25 / 44 page

Time (500 µs/div)

VOUT

VREF

C002

INA210, INA211, INA212, INA213, INA214, INA215

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SBOS437J – MAY 2008 – REVISED FEBRUARY 2017

Product Folder Links: INA210 INA211 INA212 INA213 INA214 INA215

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Typical Applications (continued)

Figure 33. Bidirectional Application Output Response

9 Power Supply Recommendations

The input circuitry of the INA21x can accurately measure beyond the power-supply voltage, V+. For example, the

V+ power supply can be 5 V, whereas the load power-supply voltage can be as high as 26 V. However, the

output voltage range of the OUT pin is limited by the voltages on the power-supply pin. Note also that the INA21x

can withstand the full input signal range up to 26 V at the input pins, regardless of whether the device has power

applied or not.

10 Layout

10.1 Layout Guidelines

•

Connect the input pins to the sensing resistor using a Kelvin or 4-wire connection. This connection technique

ensures that only the current-sensing resistor impedance is detected between the input pins. Poor routing of

the current-sensing resistor commonly results in additional resistance present between the input pins. Given

the very low ohmic value of the current resistor, any additional high-current carrying impedance can cause

significant measurement errors.

•

Place the power-supply bypass capacitor as closely as possible to the supply and ground pins. The

recommended value of this bypass capacitor is 0.1 μF. Additional decoupling capacitance can be added to

compensate for noisy or high-impedance power supplies.

INA210AIRSWR Datasheet(PDF) 25 Page - Texas Instruments