Overview
The AD8418AWBRMZ is a high-voltage, high-resolution current shunt amplifier produced by Analog Devices Inc. This device is part of the AD8418A series and is designed for bidirectional current measurements across a shunt resistor in various automotive and industrial applications. It features an initial gain of 20 V/V with a maximum ±0.15% gain error over the entire temperature range, ensuring high accuracy and reliability. The AD8418AWBRMZ includes EMI filters and patented circuitry to maintain output accuracy even with pulse-width modulation (PWM) type input common-mode voltages.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| GAIN | - | 20 V/V | - | - |
| Gain Error Over Temperature | - | - | ±0.15% | - |
| Voltage Offset, Referred to the Input (RTI) | - | ±200 µV | ±400 µV | - |
| Offset Drift | -1 µV/°C | 0.1 µV/°C | 1 µV/°C | - |
| Input Bias Current | - | 130 µA | - | - |
| Input Voltage Range (Common Mode) | -2 V | - | 70 V | - |
| Common-Mode Rejection Ratio (CMRR) | 90 dB | 100 dB | - | - |
| Output Voltage Range | 0.015 VS - 0.020 V | - | - | - |
| Output Resistance | - | - | 2 Ω | - |
| Power Supply Operating Range | 2.7 V | - | 5.5 V | - |
| Quiescent Current | - | - | 4.1 mA | - |
| Operating Temperature Range | -40°C | - | 125°C | - |
Key Features
- Bidirectional current measurements across a shunt resistor.
- High common-mode input voltage range: -2 V to +70 V.
- Excellent common-mode rejection ratio (CMRR): 90 dB (dc) and 86 dB (dc to 10 kHz).
- Zero drift architecture with a typical offset drift of 0.1 µV/°C.
- Initial gain of 20 V/V with a maximum ±0.15% gain error over the entire temperature range.
- Includes EMI filters and patented circuitry for output accuracy with PWM common-mode inputs.
- Available in 8-lead MSOP and SOIC packages.
- AEC-Q100 qualified for automotive applications.
Applications
- High-side current sensing in motor controls and solenoid controls.
- Low-side current sensing.
- Power management.
- Diagnostic protection.
- Battery management.
Q & A
- What is the initial gain of the AD8418AWBRMZ? The initial gain is 20 V/V.
- What is the operating temperature range of the AD8418AWBRMZ? The operating temperature range is -40°C to +125°C.
- What is the common-mode rejection ratio (CMRR) of the AD8418AWBRMZ? The CMRR is 90 dB (dc) and 86 dB (dc to 10 kHz).
- Does the AD8418AWBRMZ include EMI filters? Yes, it includes EMI filters and patented circuitry for output accuracy.
- What is the typical offset drift of the AD8418AWBRMZ? The typical offset drift is 0.1 µV/°C.
- What are the typical applications of the AD8418AWBRMZ? Typical applications include high-side current sensing in motor controls, solenoid controls, power management, and diagnostic protection.
- What is the power supply operating range of the AD8418AWBRMZ? The power supply operating range is 2.7 V to 5.5 V.
- Is the AD8418AWBRMZ qualified for automotive applications? Yes, it is AEC-Q100 qualified for automotive applications.
- What is the maximum quiescent current of the AD8418AWBRMZ? The maximum quiescent current is 4.1 mA.
- What are the available packages for the AD8418AWBRMZ? It is available in 8-lead MSOP and SOIC packages.
