Overview
The AD8418BRMZ from Analog Devices Inc. is a bidirectional, zero-drift current sense amplifier designed for high-precision current sensing applications. This amplifier features a unique architecture that accurately amplifies small differential current shunt voltages in the presence of rapidly changing common-mode voltages. It is particularly suited for applications requiring high common-mode rejection and stability over a wide temperature range.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range | 2.7 | 5.5 | V | |
| Operating Temperature Range | -40 | 125 | °C | |
| Gain | 20 | V/V | ||
| Gain Error Over Temperature | ±0.15% | |||
| Input Offset Voltage | ±200 | ±400 | µV | |
| Input Offset Drift | ±0.1 µV/°C | |||
| Input Bias Current | 130 µA | |||
| Common-Mode Rejection Ratio (CMRR) | 86 | 90 | 100 | dB |
| Output Voltage Range | 0.015 VS - 0.020 | V | ||
| Output Resistance | 2 Ω | |||
| Bandwidth | 250 kHz |
Key Features
- Bidirectional operation with high common-mode input voltage range (-2 V to +70 V operating, -4 V to +85 V survival)
- Zero drift architecture with typical offset drift of ±0.1 µV/°C
- High gain accuracy with an initial gain of 20 V/V and maximum ±0.15% gain error over the entire temperature range
- Excellent common-mode rejection ratio (CMRR) of up to 100 dB
- Electromagnetic interference (EMI) filters included
- Available in 8-lead SOIC and 8-lead MSOP packages
- Qualified for automotive applications with AEC-Q100 qualification
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 operating temperature range of the AD8418BRMZ?
The AD8418BRMZ operates over a temperature range of -40°C to +125°C.
- What is the typical offset drift of the AD8418BRMZ?
The typical offset drift is ±0.1 µV/°C.
- What is the common-mode rejection ratio (CMRR) of the AD8418BRMZ?
The CMRR is up to 100 dB.
- What are the available package options for the AD8418BRMZ?
The AD8418BRMZ is available in 8-lead SOIC and 8-lead MSOP packages.
- Is the AD8418BRMZ qualified for automotive applications?
Yes, the AD8418BRMZ is qualified for automotive applications with AEC-Q100 qualification.
- What is the bandwidth of the AD8418BRMZ?
The bandwidth is 250 kHz.
- What is the input bias current of the AD8418BRMZ?
The input bias current is 130 µA.
- What is the supply voltage range of the AD8418BRMZ?
The supply voltage range is 2.7 V to 5.5 V.
- Does the AD8418BRMZ include EMI filters?
Yes, the AD8418BRMZ includes EMI filters.
- What are some common applications of the AD8418BRMZ?
Common applications include high-side current sensing in motor controls, power management systems, low-side current sensing, and diagnostic protection circuits.
