SGM840
-4V to 80V, Bidirectional, Ultra-Precision Current-Sense Amplifier with High PWM Rejection
The SGM840 device is a 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 SGM840 is available in a Green SOIC-8, TSSOP-8 and MSOP-8 package. It operates in the temperature range of -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℃: ±2% (MAX)
- Offset:
- +25℃: ±90 (MAX) of SGM840A/B/C
- -40℃ to +125℃: ±230µV (MAX) of SGM840A
- -40℃ to +125℃: ±180µV (MAX) of SGM840B/C
- Available Gains:
- SGM840A: 20V/V
- SGM840B: 50V/V
- SGM840C: 100V/V
- Available in a Green SOIC-8, TSSOP-8 and MSOP-8 Package
Motor Controls
Solenoid and Valve Controls
Power Management
Actuator Controls
Pressure Regulators
Telecom Equipment
