1 Features

• Enhanced PWM rejection optimized for systems

subject to switching common-mode voltages

– Supports switching frequencies up to 125 kHz

• Wide common-mode voltage:

– Operational voltage: −5 V to +110 V

– Survival voltage: −20 V to +120 V

• Bidirectional operation

• High small signal bandwidth: 1.1 MHz (at all gains)

• Slew rate: 8 V/μs

• Step response settling time to 1%: 1 μs

• Excellent CMRR

– 166 dB DC-CMRR

– 104 dB AC-CMRR at 100 kHz

– 89 dB AC-CMRR at 1 MHz

• Accuracy:

– Gain error (maximum)

• Version A: ±0.01%, ±1 ppm/°C drift

• Version B: ±0.1%, ±5 ppm/°C drift

– Offset voltage (maximum)

• Version A: ±10 μV, ±0.1 μV/°C drift

• Version B: ±150 μV, ±0.5 μV/°C drift

• Available gains:

– INA241A1, INA241B1 : 10 V/V

– INA241A2, INA241B2 : 20 V/V

– INA241A3, INA241B3 : 50 V/V

– INA241A4, INA241B4 : 100 V/V

– INA241A5, INA241B5 : 200 V/V

• Package options: SOT23-8, VSSOP-8

2 Applications

• Motor drives

• Solenoids and actuators

• Injection molding machine

• Cordless power tools

• Medical cordless tools

• Drone propeller speed control

3 Description

The INA241x is an ultra-precise, bidirectional current

sense amplifier than can measure voltage drops

across shunt resistors over a wide common-mode

range from –5 V to 110 V, independent of the supply

voltage. The high-precision current measurement

is achieved through a combination of low offset

voltage (±10 μV, maximum), small gain error

(±0.01%, maximum) and a high DC CMRR (typical

166 dB). The INA241x is designed for high voltage,

bidirectional measurements in switching systems

that see large common-mode voltage transients at

the device's inputs. The enhanced PWM rejection

circuitry inside the INA241x ensures minimal signal

disturbance at the output due to the common-mode

voltage transitions at the input.

The INA241x operates from a single 2.7 V to 20 V

supply, drawing 2.5 mA of supply current. The

INA241x is available in five gain options: 10 V/V,

20 V/V, 50 V/V, 100 V/V, and 200 V/V. Multiple

gain options allow for optimization between available

shunt resistor values and wide output dynamic range

requirements.

The INA241x is specified over operating temperature

range of −40°C to +125°C and is offered in a spacesaving

8-pin SOT-23 and 8-pin VSSOP package.