Overview
The AD8418AWBRMZ-10RL, produced by Analog Devices Inc., is a high voltage, high resolution current shunt amplifier. This device is designed for bidirectional current measurements and is particularly suited for automotive and industrial applications. It features an initial gain of 20 V/V with a maximum gain error of ±0.15% over the entire temperature range, ensuring high accuracy in various operating conditions. The AD8418A also includes EMI filters and proprietary circuitry to maintain output accuracy even with fast-changing common-mode inputs, such as those encountered in PWM applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Initial Gain | 20 | V/V | ||
| Gain Error Over Temperature | ±0.15% | |||
| Input Voltage Range (Common Mode) | -2 | 70 | V | |
| Common-Mode Rejection Ratio (CMRR) | 90 | 100 | dB | |
| Output Voltage Range | 0.032 VS - 0.032 V | V | ||
| Operating Temperature Range | -40 | 125 (AD8418AWB, AD8418AB), 150 (AD8418AWH) | °C | |
| Power Supply Operating Range | 2.7 | 5.5 | V | |
| Quiescent Current | 4.1 (AD8418AWB, AD8418AB), 4.2 (AD8418AWH) | mA | ||
| Bandwidth | 250 | kHz | ||
| Slew Rate | 1 | V/μs |
Key Features
- Bidirectional Operation: The AD8418A can measure current in both directions across a shunt resistor.
- High Common-Mode Rejection: Offers excellent CMRR of up to 100 dB, ensuring accurate measurements even in noisy environments.
- Zero Drift Architecture: Features a novel zero drift architecture that maintains low offset and offset drift without compromising bandwidth.
- High Voltage Capability: Supports input common-mode voltages from -2 V to +70 V.
- Wide Operating Temperature Range: Qualified for operation from -40°C to +125°C (AD8418AWB, AD8418AB) and up to +150°C (AD8418AWH).
- EMI Filters and Proprietary Circuitry: Includes EMI filters and patented circuitry to ensure output accuracy with fast-changing common-mode inputs.
- Output Offset Adjustment: Allows for output offset adjustment using reference inputs VREF1 and VREF2.
Applications
- High-Side Current Sensing: Used in motor controls, solenoid controls, and power management systems.
- Low-Side Current Sensing: Suitable for various industrial and automotive applications requiring precise current measurement.
- Diagnostic Protection: Employed in diagnostic and protection circuits where accurate current sensing is critical.
- Automotive Systems: AEC-Q100 qualified, making it suitable for automotive applications that require high reliability and performance.
Q & A
- What is the initial gain of the AD8418A?
The initial gain of the AD8418A is 20 V/V.
- What is the maximum gain error over the entire temperature range?
The maximum gain error over the entire temperature range is ±0.15%.
- What is the input voltage range for common-mode operation?
The input voltage range for common-mode operation is from -2 V to +70 V.
- What is the common-mode rejection ratio (CMRR) of the AD8418A?
The CMRR is up to 100 dB.
- What is the operating temperature range of the AD8418AWB and AD8418AB models?
The operating temperature range for the AD8418AWB and AD8418AB models is from -40°C to +125°C.
- What is the operating temperature range of the AD8418AWH model?
The operating temperature range for the AD8418AWH model is from -40°C to +150°C.
- What is the power supply operating range of the AD8418A?
The power supply operating range is from 2.7 V to 5.5 V.
- What is the typical quiescent current of the AD8418A?
The typical quiescent current is 4.1 mA for AD8418AWB and AD8418AB, and 4.2 mA for AD8418AWH.
- What is the bandwidth of the AD8418A?
The bandwidth is 250 kHz.
- Is the AD8418A suitable for automotive applications?
Yes, the AD8418A is AEC-Q100 qualified for automotive applications.
