8 Power Supply Recommendations

The input circuitry of the INA21x-Q1 family of devices 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. The

INA21x-Q1 family of devices 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.

9 Layout

9.1 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.

9.2 Layout Example

Supply Bypass

Capacitor

VIA to Power or

Ground Plane

VIA to Ground Plane

Supply

Voltage

Output Signal

Trace

Copyright © 2017, Texas Instruments Incorporated

Figure 9-1. Recommended Layout

INA210-Q1, INA211-Q1, INA212-Q1, INA213-Q1, INA214-Q1, INA215-Q1

SBOS475K – MARCH 2009 – REVISED NOVEMBER 2023

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