is due to the internal chopping architecture of the amplifier. Input chopping reduces both the offset and offset drift

since any change in offset is canceled with each chopping cycle. The maximum input offset drift of the INA183

is 0.5 μV/ºC. The low drift of the gain error and offset voltage provides accurate current measurement over the

operational temperature range of -40ºC to 125ºC that exceeds the performance of most discrete current sensing

implementations.

8.4 Device Functional Modes

8.4.1 Normal Operation

The INA183 is in normal operation when the following conditions are met:

• The voltage at the IN+ pin is between 2.7 V and 26 V.

• The maximum differential input signal times the gain is less than VIN+ minus the output voltage swing to VIN+.

• The minimum differential input signal times the gain is greater than the swing to GND.

During normal operation, this device produces an output voltage that is the amplified representation of the

difference voltage from IN+ to IN–.

8.4.2 Unidirectional, High-Side Operation

The INA183 measures the differential voltage developed by current flowing through a resistor that is

commonly referred to as a current shunt resistor or current-sensing resistor. The INA183 operates in high-side,

unidirectional mode only, meaning it only senses current sourced from a power supply to a system load as

shown in Figure 8-1.

+

±

Internal

Amplifier

R1

R1

12-V

Supply

Load

IN+

IN±

RSENSE

OUT

GND

ISENSE

R2

R2

Figure 8-1. High-Side Unidirectional Application

8.4.3 Input Differential Overload

If the differential input voltage (VIN+ – VIN–) times gain exceeds the voltage swing specification, the INA183

drives the output as close as possible to the IN+ pin or ground, and does not provide accurate measurement of

the differential input voltage. If this input overload occurs during normal circuit operation, then reduce the value

of the shunt resistor or use a lower-gain version with the chosen sense resistor to avoid this mode of operation.

If a differential overload occurs in a fault event, then the output of the INA183 returns to the expected value

approximately 30 µs after removal of the fault condition. When the input differential voltage is overloaded the

bias currents will increase by a significant amount. The increase in bias currents will occur even with the device

is powered down. Input differential overloads less than the absolute maximum voltage rating do not damage the

device or result in an output inversion.

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INA183

SBOSA08 – FEBRUARY 2021

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