(ACTIVE) High/Low Side, Bi-Directional Zero-Drift Current Sense Amp w/ Enhanced PWM Rejection


Functional diagram


The INA240 device is a voltage-output, current-sense amplifier with enhanced PWM rejection that can sense drops across shunt resistors over a wide common-mode voltage range from –4 V to 80 V, independent of the supply voltage. The negative common-mode voltage allows the device to operate below ground, accommodating the flyback period of typical solenoid applications. Enhanced PWM rejection provides high levels of suppression for large common-mode transients (ΔV/Δt) in systems that use pulse width modulation (PWM) signals (such as motor drives and solenoid control systems). This feature allows for accurate current measurements without large transients and associated recovery ripple on the output voltage.

This device operates from a single 2.7-V to 5.5-V power supply, drawing a maximum of 2.4 mA of supply current. Four fixed gains are available: 20 V/V, 50 V/V, 100 V/V, and 200 V/V. The low offset of the zero-drift architecture enables current sensing with maximum drops across the shunt as low as 10-mV full-scale. All versions are specified over the extended operating temperature range (–40°C to +125°C), and are offered in an 8-pin TSSOP and 8-pin SOIC packages.


  • Enhanced PWM Rejection
  • Excellent CMRR:
    • 132-dB DC CMRR
    • 93-dB AC CMRR at 50 kHz
  • Wide Common-Mode Range: –4 V to 80 V
  • Accuracy:
    • Gain:
      • Gain Error: 0.20% (Maximum)
      • Gain Drift: 2.5 ppm/°C (Maximum)
    • Offset:
      • Offset Voltage: ±25 µV (Maximum)
      • Offset Drift: 250 nV/°C (Maximum)
  • Available Gains:
    • INA240A1: 20 V/V
    • INA240A2: 50 V/V
    • INA240A3: 100 V/V
    • INA240A4: 200 V/V
  • Quiescent Current: 2.4 mA (Maximum)

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Common Mode Voltage (Max) (V) 80   
Common Mode Voltage (Min) (V) -4   
Input Offset (+/-) (Max) (uV) 25   
Input Offset Drift (+/-) (Typ) (uV/C) 0.05   
Gain (V/V) 20^50^100^200   
Gain Error (%) 0.2   
CMRR (Min) (dB) 120   
Bandwidth (kHz) 400   
Supply Voltage (Max) (V) 5.5   
Supply Voltage (Min) (V) 2.7   
Iq (Max) (mA) 2.6   
Features Bi-directional^Enhanced PWM Rejection^Low-side Capable   
Operating Temperature Range (C) -40 to 125   
Package Group SOIC^TSSOP   
Package Size: mm2:W x L (PKG) 8SOIC: 29 mm2: 6 x 4.9(SOIC)^8TSSOP: 19 mm2: 6.4 x 3(TSSOP)   
Gain Error Drift (Max) (ppm/°C) 10   

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