Overview
The AD8418BRMZ-RL, produced by Analog Devices Inc., is a high-voltage, high-resolution current shunt amplifier. This device is designed to accurately amplify small differential current shunt voltages in the presence of rapidly changing common-mode voltages. It features a unique zero-drift architecture that ensures high accuracy and stability over a wide temperature range. The AD8418 is particularly suited for applications requiring precise current measurement and high common-mode rejection ratio (CMRR), making it ideal for various industrial and automotive uses.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| GAIN | - | 20 | - | V/V |
| Gain Error Over Temperature | - | - | ±0.15% | - |
| Voltage Offset, Referred to the Input (RTI) at 25°C | - | ±200 µV | - | - |
| Voltage Offset, Referred to the Input (RTI) Over Temperature | - | - | ±400 µV | - |
| Offset Drift | -1 | 0.1 | 1 | µV/°C |
| Input Bias Current | - | 130 | - | µA |
| Input Voltage Range (Common Mode) | -2 | - | 70 | V |
| Common-Mode Rejection Ratio (CMRR) at dc to 10 kHz | 86 | 100 | - | dB |
| Output Voltage Range (RL = 25 kΩ) | 0.015 VS - 0.020 | - | - | V |
| Output Resistance | - | 2 | - | Ω |
| Power Supply Operating Range | 2.7 | - | 5.5 | V |
| Operating Temperature Range | -40 | - | 125 | °C |
Key Features
- High voltage, high resolution current shunt amplifier with an initial gain of 20 V/V and a maximum ±0.15% gain error over the entire temperature range.
- Zero-drift architecture ensuring less than 500 nV/°C input offset drift.
- High common-mode input voltage range from -2 V to +70 V (operating) and -4 V to +85 V (survival).
- Excellent common-mode rejection ratio (CMRR) of 86 dB at dc to 10 kHz.
- Bidirectional operation and electromagnetic interference (EMI) filters included.
- Wide operating temperature range from -40°C to +125°C.
- Qualified for automotive applications with controlled manufacturing to support quality and reliability requirements.
- Available in 8-lead SOIC and 8-lead MSOP packages.
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 AD8418BRMZ-RL?
The AD8418BRMZ-RL is a high-voltage, high-resolution current shunt amplifier designed to accurately amplify small differential current shunt voltages. - What is the gain of the AD8418BRMZ-RL?
The initial gain of the AD8418BRMZ-RL 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 offset drift of the AD8418BRMZ-RL?
The input offset drift is less than 500 nV/°C. - What is the common-mode input voltage range of the AD8418BRMZ-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 AD8418BRMZ-RL?
The CMRR is 86 dB at dc to 10 kHz. - What are the available packages for the AD8418BRMZ-RL?
The AD8418BRMZ-RL is available in 8-lead SOIC and 8-lead MSOP packages. - Is the AD8418BRMZ-RL qualified for automotive applications?
Yes, the AD8418BRMZ-RL is qualified for automotive applications with controlled manufacturing to support quality and reliability requirements. - What is the operating temperature range of the AD8418BRMZ-RL?
The operating temperature range is from -40°C to +125°C. - What are some typical applications of the AD8418BRMZ-RL?
Typical applications include high-side current sensing in motor controls and solenoid controls, power management systems, low-side current sensing, and diagnostic protection circuits.
