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-4V to 80V, Automotive Bidirectional, Ultra-Precision Current-Sense Amplifier with High PWM Rejection.
SGM840Q SGM840Q.pdf

No.14142

FEATURES

? AEC-Q100 Qualified for Automotive Applications

  Device Temperature Grade 1

  TA = -40℃ to +125℃

? Functional Safety-Capable

  Documentation Available to Aid Functional 

  Safety System Design

? High PWM Rejection

? Excellent CMRR:

  130dB (TYP) DC CMRR

  80dB (TYP) AC CMRR at 50kHz

? Wide Common-Mode Range: -4V to 80V

? Gain Error:

  +25℃: ±0.35% (MAX)

  -40℃ to +125℃: ±1.5% (MAX)

? Offset:

  +25℃: ±90μV (MAX)

  -40℃ to +125℃: ±150μV (MAX)

? Available Gains:

  SGM840AQ: 20V/V

  SGM840BQ: 50V/V

  SGM840CQ: 100V/V

? Available in a Green SOIC-8 Package

DESCRIPTION

The SGM840xQ device is an automotive-qualified, bidirectional, fixed gain, voltage-output, current-sense amplifier which features high PWM rejection and wide common-mode voltage range from -4V to 80V.
The high PWM rejection suppresses large common mode transients (ΔV/Δt) on the output signal, which is particularly relevant for applications utilizing pulse width modulation (PWM), such as motor driver and solenoid control systems. The negative common-mode voltage capability allows the device to function even when the voltage is below ground, which is useful in typical applications like the flyback period of a solenoid.
These characteristics make accurate current measurement without large transients and related recovery disturbances on the output voltage.
The device is powered from a single 2.7V to 5.5V supply, and draws 1mA (TYP) supply current. There are three fixed gain options: 20V/V, 50V/V and 100V/V. The low offset in the zero-drift architecture enables highly accurate current sensing, even with very small voltage drops across the shunt as low as 10mV full-scale.
The device is AEC-Q100 qualified (Automotive Electronics Council (AEC) standard Q100 Grade 1) and it is suitable for automotive applications.
The SGM840xQ is available in a Green SOIC-8 package. It operates in the temperature range of -40℃ to +125.

APPLICATION CIRCUIT
PIN CONFIGUTION
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