INA210CIRSWR datasheet(24/40 Pages) TI1

24 / 40 page

Supply Bypass

Capacitor

VIA to Power or

Ground Plane

VIA to Ground

Plane

Supply

Voltage

Output Signal

Trace

INA210, INA211, INA212, INA213, INA214, INA215

SBOS437I – MAY 2008 – REVISED SEPTEMBER 2016

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Product Folder Links: INA210 INA211 INA212 INA213 INA214 INA215

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10 Power Supply Recommendations

The input circuitry of the INA210-INA215 can accurately measure beyond its 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 INA210-INA215 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.

11 Layout

11.1 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.

11.2 Layout Example

Figure 34. Recommended Layout

INA210CIRSWR Datasheet(PDF) 24 Page - Texas Instruments