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Home » NEWEST Products » New by Category » Semiconductors » Amplifier ICs » AD8418A Current Sense Amplifier - Analog Devices
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Analog Devices AD8418A Bidirectional, Current Sense Amplifier

Analog Devices AD8418A Bidirectional,
Zero Drift Current Sense Amplifier

Analog Devices AD8418A Bidirectional, Current Sense Amplifier is a high voltage, high resolution current shunt amplifier featuring an initial gain of 20 V/V, with a maximum ±0.2% gain error. Qualified for automotive applications, the device provides breakthrough performance throughout the −40°C to +125°C operating temperature range. The EMI filters and patented circuitry enable output accuracy with pulse-width modulation (PWM) type input common-mode voltages. AD8418A offers a typical input offset voltage of  ±200 μV and an excellent input common-mode rejection ratio of 86 dB, dc to 10 kHz from −2 V to +70 V. The zero drift core leads to a typical offset drift of 0.1 μV/°C throughout the operating temperature and the common-mode voltage range. The design makes the AD8418A Current Sense Amplifier ideal for performing bidirectional current measurements across a shunt resistor in a variety of automotive and industrial applications including motor control, power management, and solenoid control.

Features
  • Typical 0.1 μV/°C offset drift
  • Maximum ±400 μV voltage offset over full temperature range
  • 2.7 V to 5.5 V power supply operating range
  • Electromagnetic interference (EMI) filters included
  • High common-mode input voltage range
    • −2 V to +70 V continuous
    • −4 V to +85 V survival
  • Common-mode rejection ratio (CMRR): 86 dB, dc to 10 kHz
  • Initial gain = 20 V/V
  • Wide operating temperature range:−40°C to +125°C
  • Bidirectional operation
  • Available in 8-lead SOIC and 8-lead MSOP
  • Qualified for automotive applications
Applications
  • High-side current sensing in
    • Motor controls
    • Solenoid controls
    • Power management
  • Low-side current sensing
  • Diagnostic protection
Functional Block Diagram
Functional Block Diagram
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  • Analog Devices Inc.