Overview
The AD8418AWBRZ, produced by Analog Devices Inc., is a bidirectional, zero drift current sense amplifier designed for high-precision current measurements in various automotive and industrial applications. This amplifier 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. It is particularly suited for high-side and low-side current sensing in motor controls, solenoid controls, and power management systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| 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 | - |
| 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 Bandwidth | - | - | 250 kHz | - |
| Slew Rate | - | - | 1 V/μs | - |
| Operating Temperature Range | -40 | - | 125°C (AD8418AWB, AD8418AB), 150°C (AD8418AWH) | °C |
| Power Supply Range | 2.7 | - | 5.5 | V |
| Quiescent Current | - | - | 4.1 mA (AD8418AWB, AD8418AB), 4.2 mA (AD8418AWH) | - |
Key Features
- Bidirectional Operation: Capable of measuring current in both directions across a shunt resistor.
- High Gain Accuracy: Initial gain of 20 V/V with a maximum ±0.15% gain error over the entire temperature range.
- Zero Drift Architecture: Ensures low offset and offset drift, less than 400 nV/°C.
- High Common-Mode Rejection Ratio (CMRR): Up to 100 dB, effective even with fast-changing PWM common-mode inputs.
- Wide Operating Temperature Range: From -40°C to +125°C (AD8418AWB, AD8418AB) and up to +150°C (AD8418AWH).
- Low Power Consumption: Quiescent current of 4.1 mA (AD8418AWB, AD8418AB) and 4.2 mA (AD8418AWH).
- High Bandwidth: Small signal bandwidth of 250 kHz and slew rate of 1 V/μs.
- Compact Packaging: Available in 8-lead SOIC_N, 8-lead MSOP, and FMEA tolerant 10-lead MSOP pinout.
- AEC-Q100 Qualified: Suitable for automotive applications.
Applications
- High-Side Current Sensing in Motor Controls: Accurate current measurement for motor control systems.
- Solenoid Controls: Precise control and measurement in solenoid applications.
- Power Management: Current sensing in power management systems.
- Low-Side Current Sensing: Measurement of current in low-side configurations.
- Diagnostic Protection: Used in diagnostic and protection circuits.
- Laboratory and Testing Equipment: Signal amplification, frequency conversion, and noise control in laboratory settings.
- Medical Field: Signal processing and enhancement in medical devices and diagnostic systems.
- Audio Processing: Enhancing volume and clarity in sound systems.
- Video Equipment: Enhancing brightness and contrast in video signals.
- Industrial Automation: Precise control and measurement in industrial control equipment and robots.
Q & A
- What is the primary function of the AD8418AWBRZ?
The AD8418AWBRZ is a bidirectional, zero drift current sense amplifier designed for high-precision current measurements.
- What is the gain of the AD8418AWBRZ?
The initial gain of the AD8418AWBRZ is 20 V/V with a maximum ±0.15% gain error over the entire temperature range.
- What is the common-mode rejection ratio (CMRR) of the AD8418AWBRZ?
The CMRR is up to 100 dB, effective even with fast-changing PWM common-mode inputs.
- What is the operating temperature range of the AD8418AWBRZ?
The operating temperature range is from -40°C to +125°C (AD8418AWB, AD8418AB) and up to +150°C (AD8418AWH).
- What is the power supply range for the AD8418AWBRZ?
The power supply range is from 2.7 V to 5.5 V.
- What is the quiescent current of the AD8418AWBRZ?
The quiescent current is 4.1 mA (AD8418AWB, AD8418AB) and 4.2 mA (AD8418AWH).
- What are the typical applications of the AD8418AWBRZ?
High-side and low-side current sensing in motor controls, solenoid controls, power management, and diagnostic protection.
- Is the AD8418AWBRZ AEC-Q100 qualified?
Yes, the AD8418AWBRZ is AEC-Q100 qualified for automotive applications.
- What is the bandwidth of the AD8418AWBRZ?
The small signal bandwidth is 250 kHz and the slew rate is 1 V/μs.
- What packaging options are available for the AD8418AWBRZ?
Available in 8-lead SOIC_N, 8-lead MSOP, and FMEA tolerant 10-lead MSOP pinout.
