Analog Devices Inc. AD8418A Current Sense Amplifiers
Analog Devices Inc. AD8418A Bidirectional, Current Sense Amplifiers are high-voltage, high-resolution current shunt amplifiers featuring an initial gain of 20V/V, with a maximum ±0.2% gain error. Qualified for automotive applications, the devices provide 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 ±200μV and an excellent input common-mode rejection ratio of 86dB, dc to 10kHz from −2V to +70V. The zero drift core leads to a typical offset drift of 0.1μV/°C throughout the operating temperature and the common-mode voltage range.
The design makes the AD8418A Current Sense Amplifiers 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.
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Features
- Typical 0.1μV/°C offset drift
- Maximum ±400μV voltage offset over full temperature range
- 2.7V to 5.5V power supply operating range
- Electromagnetic interference (EMI) filters included
- High common-mode input voltage range
- Common-mode rejection ratio (CMRR): 86dB, dc to 10kHz
- Initial gain = 20V/V
- Wide operating temperature range:
- AD8418AWB: −40°C to +125°C
- AD8418AWH:−40°C to +150°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
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