Overview
The AD8418WBRMZ-RL is a high-voltage, high-resolution current shunt amplifier produced by Analog Devices Inc. This bidirectional, zero-drift current sense amplifier is designed to accurately amplify small differential current shunt voltages in the presence of rapidly changing common-mode voltages. It features an initial gain of 20 V/V and a maximum gain error of ±0.15% over the entire temperature range. The AD8418WBRMZ-RL is particularly suited for applications requiring high common-mode rejection and stability across a wide temperature range.
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 | µV |
| Offset Drift | -1 | 0.1 | 1 | µV/°C |
| Input Bias Current | - | - | 130 µA | µA |
| Common-Mode Input Voltage Range | -2 | - | 70 | V |
| Common-Mode Rejection Ratio (CMRR) | 90 | 100 | - | dB (dc to 10 kHz: 86 dB) |
| Output Voltage Range | 0.015 VS - 0.020 V | - | - | V |
| Output Resistance | - | - | 2 Ω | Ω |
| Small Signal -3 dB Bandwidth | - | 250 kHz | - | kHz |
| Slew Rate | - | 1 V/µs | - | V/µs |
| Power Supply Operating Range | 2.7 | - | 5.5 | V |
| Operating Temperature Range | -40 | - | 125 | °C |
Key Features
- Bidirectional operation with an initial gain of 20 V/V and a maximum gain error of ±0.15% over the entire temperature range.
- Zero drift architecture with a typical offset drift of 0.1 µV/°C.
- High common-mode input voltage range from -2 V to +70 V (operating) and -4 V to +85 V (survival).
- High common-mode rejection ratio (CMRR) of 86 dB from dc to 10 kHz.
- Electromagnetic interference (EMI) filters included.
- Wide operating temperature range from -40°C to +125°C.
- Available in 8-lead SOIC and 8-lead MSOP packages.
- Qualified for automotive applications with controlled manufacturing to support quality and reliability requirements.
Applications
- High-side current sensing in motor controls and power management systems.
- Solenoid controls and diagnostic protection.
- Low-side current sensing in various industrial and automotive applications.
- Battery management systems.
Q & A
- What is the primary function of the AD8418WBRMZ-RL?
The AD8418WBRMZ-RL is a bidirectional, zero-drift current sense amplifier designed to accurately amplify small differential current shunt voltages.
- What is the gain of the AD8418WBRMZ-RL?
The initial gain of the AD8418WBRMZ-RL is 20 V/V.
- What is the typical offset drift of the AD8418WBRMZ-RL?
The typical offset drift is 0.1 µV/°C.
- What is the common-mode input voltage range of the AD8418WBRMZ-RL?
The common-mode input voltage range is from -2 V to +70 V (operating) and -4 V to +85 V (survival).
- What is the common-mode rejection ratio (CMRR) of the AD8418WBRMZ-RL?
The CMRR is 86 dB from dc to 10 kHz.
- What are the available packages for the AD8418WBRMZ-RL?
The AD8418WBRMZ-RL is available in 8-lead SOIC and 8-lead MSOP packages.
- Is the AD8418WBRMZ-RL qualified for automotive applications?
Yes, the AD8418WBRMZ-RL is qualified for automotive applications with controlled manufacturing to support quality and reliability requirements.
- What is the operating temperature range of the AD8418WBRMZ-RL?
The operating temperature range is from -40°C to +125°C.
- Does the AD8418WBRMZ-RL include EMI filters?
Yes, the AD8418WBRMZ-RL includes EMI filters.
- What is the slew rate of the AD8418WBRMZ-RL?
The slew rate is 1 V/µs.
- What is the power supply operating range of the AD8418WBRMZ-RL?
The power supply operating range is from 2.7 V to 5.5 V.
