INA240 (ACTIVE)

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

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

Description

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.

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% (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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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)
Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
Gain Error Drift (Max) (ppm/°C)
INA240 INA240-Q1 LMP8601 LMP8601-Q1
80    80    60    60   
-4    -4    -22    -22   
25    25    1000    1000   
0.05    0.05    2    2   
20
50
100
200   
20
50
100
200   
20
50
100   
20
50
100   
0.2    0.2    0.5    0.5   
120    120    90    90   
400    400    60    60   
5.5    5.5    5.5    5.5   
2.7    2.7    3    3   
2.6    2.6    1.5    1.5   
Bi-directional
Enhanced PWM Rejection
Low-side Capable   
Bi-directional
Enhanced PWM Rejection
Low-side Capable   
Bi-directional
Low-side Capable   
Bi-directional
Low-side Capable   
  Automotive      Automotive   
-40 to 125    -40 to 150
-40 to 125   
-40 to 125    -40 to 125
-40 to 150   
SOIC
TSSOP   
SOIC
TSSOP   
SOIC    SOIC   
8SOIC: 29 mm2: 6 x 4.9(SOIC)
8TSSOP: 19 mm2: 6.4 x 3(TSSOP)   
8SOIC: 29 mm2: 6 x 4.9(SOIC)
8TSSOP: 19 mm2: 6.4 x 3(TSSOP)   
8SOIC: 29 mm2: 6 x 4.9(SOIC)    8SOIC: 29 mm2: 6 x 4.9(SOIC)   
10    10    20    20   

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