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AD8418
Bidirectional, Zero-Drift, Current Sense Amplifier
Overview
Features and Benefits
- 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 operating
−4 V to +85 V survival - 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
- Common-mode rejection ratio (CMRR): 86 dB, dc to 10 kHz
- Qualified for automotive applications
Product Details
The AD8418 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 AD8418 offers excellent input common-mode rejection from −2 V to +70 V. The AD8418 performs bidirectional current measurements across a shunt resistor in a variety of automotive and industrial applications, including motor control, battery management, and solenoid control.
The AD8418 offers breakthrough performance throughout the −40°C to +125°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 AD8418 is fully qualified for automotive applications and 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 AD8418 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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Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
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