Overview
The AD8418AWBRZ-RL, produced by Analog Devices Inc., is a high voltage, high resolution current shunt amplifier. It is designed for bidirectional current measurements and features a zero drift core, which ensures low offset and offset drift. This amplifier is particularly suited for automotive and industrial applications due to its robust performance across a wide temperature range and its ability to reject high common-mode voltages, including those from PWM inputs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Initial Gain | - | 20 | - | V/V |
| Gain Error Over Temperature | - | - | ±0.15% | - |
| Offset Voltage (RTI) | - | ±100 μV | - | - |
| Offset Drift | -0.4 | - | +0.4 | μV/°C |
| Input Bias Current | - | 130 μA | 260 μA | - |
| Input Voltage Range (Common Mode) | -2 | - | +70 | V |
| Common-Mode Rejection Ratio (CMRR) | 90 | 100 | - | dB |
| Output Voltage Range | 0.032 VS - 0.032 V | - | - | - |
| Output Resistance | - | - | 2 Ω | - |
| Small Signal -3 dB Bandwidth | - | 250 kHz | - | - |
| Slew Rate | - | 1 V/μs | - | - |
| Operating Temperature Range | -40°C | - | +125°C (AD8418AWB, AD8418AB), +150°C (AD8418AWH) | - |
| Power Supply Operating Range | 2.7 V | - | 5.5 V | - |
| Quiescent Current | - | 4.1 mA (AD8418AWB, AD8418AB), 4.2 mA (AD8418AWH) | - | - |
Key Features
- Zero Drift Core: Ensures low offset and offset drift, less than 400 nV/°C.
- High Gain Accuracy: Initial gain of 20 V/V with a maximum ±0.15% gain error over the entire temperature range.
- Wide Operating Temperature Range: From -40°C to +125°C (AD8418AWB, AD8418AB) and up to +150°C (AD8418AWH).
- High Common-Mode Rejection Ratio (CMRR): Up to 100 dB, ensuring excellent rejection of common-mode voltages.
- Bidirectional Operation: Capable of measuring current in both directions across a shunt resistor.
- Robust Power Supply Rejection Ratio (PSRR): Up to 80 dB.
- Low Noise and High Bandwidth: Small signal -3 dB bandwidth of 250 kHz and a slew rate of 1 V/μs.
- AEC-Q100 Qualified: Suitable for automotive applications.
Applications
- High-Side Current Sensing: In motor controls, solenoid controls, and power management systems.
- Low-Side Current Sensing: In various industrial and automotive applications.
- Diagnostic Protection: For monitoring and protecting against overcurrent conditions.
Q & A
- What is the initial gain of the AD8418AWBRZ-RL? The initial gain is 20 V/V.
- What is the maximum gain error over the temperature range? The maximum gain error is ±0.15%.
- What is the operating temperature range for the AD8418AWB and AD8418AB models? The operating temperature range is from -40°C to +125°C.
- What is the operating temperature range for the AD8418AWH model? The operating temperature range is from -40°C to +150°C.
- What is the common-mode rejection ratio (CMRR) of the AD8418AWBRZ-RL? The CMRR is up to 100 dB.
- Is the AD8418AWBRZ-RL AEC-Q100 qualified? Yes, it is AEC-Q100 qualified for automotive applications.
- What is the input bias current of the AD8418AWBRZ-RL? The input bias current is up to 260 μA.
- What is the small signal -3 dB bandwidth of the AD8418AWBRZ-RL? The small signal -3 dB bandwidth is 250 kHz.
- What is the slew rate of the AD8418AWBRZ-RL? The slew rate is 1 V/μs.
- What are some common applications of the AD8418AWBRZ-RL? Common applications include high-side and low-side current sensing in motor controls, solenoid controls, power management, and diagnostic protection.
