Overview
The AD8418WBRZ, produced by Analog Devices Inc., is a high-precision, low-power current sense amplifier designed for automotive and industrial applications. This device features a single-supply operation with a voltage range of 2.7V to 5.5V and is known for its bidirectional, zero-drift current sensing capabilities. The AD8418WBRZ is part of the AD8418 family, which is distinguished by its excellent stability over a wide temperature range of -40°C to +125°C, making it suitable for harsh environments.
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 | ±400 µV | ||
| OFFSET DRIFT | -0.4 µV/°C | 0.1 µV/°C | 0.4 µV/°C | |
| INPUT BIAS CURRENT | 130 µA | |||
| INPUT VOLTAGE RANGE (Common Mode) | -2 V | +70 V | ||
| COMMON-MODE REJECTION RATIO (CMRR) | 86 dB (dc to 10 kHz) | 90 dB (dc) | 100 dB (dc) | |
| OUTPUT VOLTAGE RANGE (RL = 25 kΩ) | 0.015 VS - 0.020 V | |||
| OUTPUT RESISTANCE | 2 Ω | |||
| POWER SUPPLY OPERATING RANGE | 2.7 V | 5.5 V | ||
| QUIESCENT CURRENT | 2.6 mA | |||
| OPERATING TEMPERATURE RANGE | -40°C | +125°C |
Key Features
- Bidirectional, Zero Drift Current Sensing: The AD8418WBRZ can measure current in both directions with a typical offset drift of 0.1 µV/°C, ensuring high accuracy over the entire temperature range.
- High Common-Mode Input Voltage Range: Operates from -2 V to +70 V, making it suitable for high-side current sensing in various applications.
- High Gain Accuracy: Initial gain of 20 V/V with a maximum ±0.15% gain error over the specified temperature range.
- Low Power Consumption: Quiescent current of 2.6 mA, contributing to energy-efficient designs.
- High Common-Mode Rejection Ratio (CMRR): Up to 100 dB at dc and 86 dB from dc to 10 kHz, ensuring robust performance against common-mode noise.
- Compact Packaging: Available in 8-lead SOIC and MSOP packages, suitable for space-constrained designs.
- Automotive Grade Qualification: Compliant with AEC-Q100 standards, ensuring reliability in automotive applications.
- EMI Filters and Patented Circuitry: Includes EMI filters and patented technology to handle fast-changing common-mode inputs, such as those from PWM signals).
Applications
- High-Side Current Sensing: Ideal for motor controls, solenoid controls, and power management systems where high accuracy and stability are required).
- Low-Side Current Sensing: Suitable for applications where the current sensing needs to be done on the low side of the power supply).
- Diagnostic Protection: Used in diagnostic circuits to monitor and protect against overcurrent conditions).
- Battery Management: Employed in battery management systems to accurately measure current flow).
- Industrial Automation: Applicable in various industrial automation scenarios requiring precise current measurement and control).
Q & A
- What is the operating temperature range of the AD8418WBRZ?
The AD8418WBRZ operates over a temperature range of -40°C to +125°C).
- What is the typical offset drift of the AD8418WBRZ?
The typical offset drift is 0.1 µV/°C).
- What is the common-mode input voltage range of the AD8418WBRZ?
The common-mode input voltage range is from -2 V to +70 V).
- What is the initial gain of the AD8418WBRZ?
The initial gain is 20 V/V).
- What is the quiescent current of the AD8418WBRZ?
The quiescent current is 2.6 mA).
- Is the AD8418WBRZ qualified for automotive applications?
Yes, it is qualified for automotive applications and complies with AEC-Q100 standards).
- What types of packages are available for the AD8418WBRZ?
The AD8418WBRZ is available in 8-lead SOIC and MSOP packages).
- What is the bandwidth of the AD8418WBRZ?
The small signal -3 dB bandwidth is 250 kHz).
- Does the AD8418WBRZ include EMI filters?
Yes, it includes EMI filters to enhance output accuracy, especially with PWM type input common-mode voltages).
- Is the AD8418WBRZ RoHS compliant?
Yes, it is compliant with the RoHS3 directive).
