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AD8418A Bidirectional, Zero-Drift, Current Sense Amplifier

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 ±0.2% 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 devices 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 ±200 µV. The AD8418A is offered in 8-lead MSOP and SOIC packages.

Applications

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

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