High/Low Side, Bi-Directional Zero-Drift Current Sense Amp w/ Enhanced PWM Rejection - INA240

INA240 (ACTIVE)

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

 

Description

The INA240 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 package.

Features

  • 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% (max)
      • Gain Drift: 2.5 ppm/°C (max)
    • Offset:
      • Offset Voltage: ±25 µV (max)
      • Offset Drift: 250 nV/°C (max)
  • Available Gains:
    • INA240A1: 20 V/V
    • INA240A2: 50 V/V
    • INA240A3: 100 V/V
    • INA240A4: 200 V/V
  • Quiescent Current: 2.4 mA (max)

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Parametrics Compare all products in Current Sense Amplifiers Analog Output

 
Common Mode Voltage (Max) (V)
Common Mode Voltage (Min) (V)
Input Offset (+/-) (Max) (uV)
Input Offset Drift (+/-) (Typ) (uV/C)
Gain (V/V)
Gain Error (%)
CMRR (Min) (dB)
Bandwidth (kHz)
Supply Voltage (Max) (V)
Supply Voltage (Min) (V)
Iq (Max) (mA)
Special Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
Gain Error Drift (Max) (ppm/°C)
PSRR (Typ) (uV/V)
Specified Common Mode Voltage (V)
Specified Power Supply Voltage (V)
INA240
80   
-4   
25   
0.05   
20
50
100
200   
0.2   
120   
400   
5.5   
2.7   
2.6   
Bi-directional
Enhanced PWM Rejection
Low-side Capable   
Catalog   
-40 to 125   
SOIC
TSSOP   
8TSSOP: 19 mm2: 6.4 x 3(TSSOP)
8SOIC: 29 mm2: 6 x 4.9(SOIC)   
10   
1   
12   
5   

Other qualified versions of INA240

Version Part Number Definition
Automotive INA240-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

INA240 Error Analysis

0.001m ≤ 
 mOhm ≤ 100m
0.0001 ≤ 
A
A ≤ 100 
2.7 ≤ 
V ≤ 5.5
-4 ≤ 
V ≤ 80
-40 ≤ 
C ≤ 125