INA234 datasheet(32/45 Pages) TI

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TIME (50 µs / div)

LIMIT: 72 mV

~140 µs (1 conversion)

< 280 µs (2 conversions)

Figure 8-3. Alert Response (tCT = 140 µs)

TIME (500 µs / div)

LIMIT: 72 mV

1000 µs (~1 conversion)

< 2200 µs (2 conversions)

Figure 8-4. Alert Response (tCT = 1.1 ms)

8.3 Power Supply Recommendations

Figure 8-2 shows that the device input circuitry can accurately measure signals on common-mode voltages

beyond the power-supply voltage, VS. For example, the voltage applied to the vs. power supply pin can be 5 V,

whereas the bus power-supply voltage being monitored (the common-mode voltage) can be as high as 28 V.

The device can also withstand the full -0.3 V to 28 V range at the input pins, regardless of whether the device

has power applied or not.

Place the required power-supply bypass capacitors as close as possible to the supply and ground pins of the

device to ensure stability. A typical value for this supply bypass capacitor is 0.1 µF. Applications with noisy or

high-impedance power supplies can require additional decoupling capacitors to reject power-supply noise.

8.4 Layout

8.4.1 Layout Guidelines

Connect the input pins (IN+ and IN–) to the sensing resistor using a Kelvin connection or a 4-wire connection.

These connection techniques ensure 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-sensing resistor, any additional high-

current carrying impedance causes significant measurement errors. Place the power-supply bypass capacitor as

close as possible to the supply and ground pins.

INA234

SBOS844C – MAY 2021 – REVISED MARCH 2023

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INA234 Datasheet(PDF) 32 Page - Texas Instruments