AD8418A Datasheet

• Typical 0.1 μV/°C offset drift
• Maximum ±200 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 operation
  • −3 V to +80 V, continuous survival
• Minimum DC common-mode rejection ratio (CMRR): 90 dB
• Initial gain = 20 V/V
• Wide operating temperature range
  • AD8418AWB and AD8418AB: −40°C to +125°C
  • AD8418AWH: −40°C to +150°C
• Bidirectional operation
• Available in 8-lead SOIC_N, 8-lead MSOP, and FMEA tolerant
  • 10-lead MSOP pinout
• AEC-Q100 qualified for automotive applications

• High-side current sensing in
  • Motor controls
  • Solenoid controls
  • Power management
• Low-side current sensing
• Diagnostic protection

The AD8418A is a high voltage, high resolution current shunt amplifier. It features an initial gain of 20 V/V, with a maximum ±0.15% gain error over the entire temperature range. The buffered output voltage directly interfaces with any typical converter. The AD8418A offers excellent input common-mode rejection from −2 V to +70 V. The AD8418A performs bidirectional current measurements across a shunt resistor in a variety of automotive and industrial applications, including motor control, power management, and solenoid control.

The AD8418A offers breakthrough performance throughout the −40°C to +150°C temperature range. It features a zero drift core, which leads to a typical offset drift of 0.1 μV/°C throughout the operating temperature range and the common-mode voltage range. The AD8418A is qualified for automotive applications. The device includes EMI filters and patented circuitry to enable output accuracy with pulse-width modulation (PWM) type input common-mode voltages. The typical input offset voltage is ±100 μV. The AD8418A is offered in an 8-lead MSOP and an 8-lead SOIC_N package with a 10-lead MSOP pinout option engineered for failure mode and effects analysis (FMEA).