Overview
The AD8418WBRMZ is a high-voltage, high-resolution current sense amplifier produced by Analog Devices Inc. This device is designed for bidirectional current sensing and features a unique zero drift architecture, ensuring high accuracy and stability over a wide temperature range. It is particularly suited for automotive and industrial applications, offering excellent common-mode rejection and robust performance in the presence of rapidly changing common-mode voltages.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Gain | 20 | - | - | V/V |
| Gain Error Over Temperature | - | - | ±0.15% | - |
| Voltage Offset (RTI) at 25°C | - | ±200 µV | - | µV |
| Voltage Offset Drift | -1 | 0.1 | 1 | µV/°C |
| Input Bias Current | - | 130 µA | - | µA |
| Input Voltage Range (Common Mode) | -2 | - | 70 | V |
| Common-Mode Rejection Ratio (CMRR) | 90 | 100 | - | dB (dc to 10 kHz: 86 dB) |
| Output Voltage Range (RL = 25 kΩ) | 0.015 VS - 0.020 V | - | - | V |
| Output Resistance | - | 2 | - | Ω |
| Supply Voltage Range | 2.7 | - | 5.5 | V |
| Quiescent Current | - | 2.6 mA | - | mA |
| Operating Temperature Range | -40 | - | 125 | °C |
| Package Type | - | 8-MSOP | - | - |
Key Features
- Bidirectional current sensing capability
- Zero drift architecture with typical offset drift of 0.1 µV/°C
- High common-mode input voltage range: -2 V to +70 V operating, -4 V to +85 V survival
- Initial gain of 20 V/V with a maximum ±0.15% gain error over the entire temperature range
- Excellent common-mode rejection ratio (CMRR): 86 dB (dc to 10 kHz)
- EMI filters included for improved noise immunity
- Wide operating temperature range: -40°C to +125°C
- Available in 8-lead SOIC and 8-lead MSOP packages
- AEC-Q100 qualified for automotive applications
Applications
- High-side current sensing in motor controls and solenoid controls
- Power management systems
- Low-side current sensing
- Diagnostic protection circuits
Q & A
- What is the primary function of the AD8418WBRMZ? The AD8418WBRMZ is a high-voltage, high-resolution current sense amplifier designed for bidirectional current sensing.
- What is the typical offset drift of the AD8418WBRMZ? The typical offset drift is 0.1 µV/°C.
- What is the common-mode input voltage range of the AD8418WBRMZ? The common-mode input voltage range is -2 V to +70 V operating, and -4 V to +85 V for survival.
- What is the initial gain of the AD8418WBRMZ? The initial gain is 20 V/V.
- What is the maximum gain error over the entire temperature range? The maximum gain error is ±0.15%.
- What is the common-mode rejection ratio (CMRR) of the AD8418WBRMZ? The CMRR is 86 dB (dc to 10 kHz).
- What are the available package types for the AD8418WBRMZ? The device is available in 8-lead SOIC and 8-lead MSOP packages.
- Is the AD8418WBRMZ qualified for automotive applications? Yes, it is AEC-Q100 qualified for automotive applications.
- What is the operating temperature range of the AD8418WBRMZ? The operating temperature range is -40°C to +125°C.
- What is the supply voltage range for the AD8418WBRMZ? The supply voltage range is 2.7 V to 5.5 V.
