Overview
The AD8205WYRZ-R7, manufactured by Analog Devices Inc., is a single-supply, bidirectional differential amplifier designed to accurately amplify small differential voltages in the presence of large common-mode voltages. This device is particularly suited for high-side current sensing and other applications requiring high accuracy and robust common-mode rejection. The AD8205 operates with a single supply voltage ranging from 4.5 V to 10 V, with an absolute maximum of 12.5 V, and is available in an 8-lead SOIC package.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Gain | 50 | 50 | 50 | V/V |
| Gain Accuracy (VO ≥ 0.1 V dc, 25°C) | ±1 | ±1 | ±1 | % |
| Gain Accuracy Over Temperature | ±1.2 | ±1.2 | ±1.2 | % |
| Gain vs. Temperature | ±30 | ±30 | ±30 | ppm/°C |
| Offset Voltage (RTI) at 25°C | ±2 | ±2 | ±2 | mV |
| Offset Voltage (RTI) Over Temperature | ±4.5 | ±4.5 | ±4.5 | mV |
| Offset Drift | 15 | 15 | 15 | µV/°C |
| Differential Input Impedance | 400 | 400 | 400 | kΩ |
| Common Mode Input Impedance | 200 | 200 | 200 | kΩ |
| Common Mode Input Voltage Range | -2 | 65 | V | |
| Differential Input Voltage Range | ±50 | mV | ||
| Common Mode Rejection Ratio (CMRR) at 25°C, dc to 20 kHz | 78 | 86 | 86 | dB |
| Operating Temperature Range (Y and W Grade) | -40 | 125 | °C | |
| Operating Temperature Range (H Grade) | -40 | 150 | °C | |
| Supply Voltage | 4.5 | 10 | V | |
| Supply Current | <2 | mA |
Key Features
- Single-Supply Operation: The AD8205 operates with a single supply voltage from 4.5 V to 10 V, with an absolute maximum of 12.5 V.
- High Common-Mode Rejection Ratio (CMRR): Better than 78 dB from dc to 20 kHz, ensuring high accuracy in the presence of common-mode voltages.
- High Gain Accuracy: The gain is 50 V/V with an accuracy of ±1.2% over the operating temperature range.
- Low Offset Voltage and Drift: Offset voltage less than 2 mV at 25°C and 4.5 mV maximum over the full operating temperature range, with an offset drift of 15 µV/°C.
- Wide Operating Temperature Range: Y and W Grade: -40°C to +125°C, H Grade: -40°C to +150°C.
- Adjustable Output Offset: Output offset can be adjusted from 0.05 V to 4.8 V for unipolar and bipolar operation.
- Low Input Bias Current: Ensuring improved accuracy in measurements.
- Automotive Qualification: Available with controlled manufacturing to support the quality and reliability requirements of automotive applications.
Applications
- High-Side Current Sensing: In motor controls, transmission controls, diesel injection controls, engine management, suspension controls, and vehicle dynamic controls.
- DC-to-DC Converters: For accurate current measurement and control.
- Industrial Automation: For monitoring and controlling various industrial processes.
- Aerospace and Defense: Where high reliability and accuracy are critical.
Q & A
- What is the primary function of the AD8205WYRZ-R7?
The AD8205WYRZ-R7 is a single-supply differential amplifier designed to accurately amplify small differential voltages in the presence of large common-mode voltages.
- What is the gain of the AD8205WYRZ-R7?
The gain of the AD8205WYRZ-R7 is 50 V/V with an accuracy of ±1.2% over the operating temperature range.
- What is the common-mode rejection ratio (CMRR) of the AD8205WYRZ-R7?
The CMRR is better than 78 dB from dc to 20 kHz.
- What is the operating temperature range for the Y and W Grade models?
The operating temperature range for the Y and W Grade models is -40°C to +125°C.
- What is the operating temperature range for the H Grade model?
The operating temperature range for the H Grade model is -40°C to +150°C.
- What is the typical supply voltage for the AD8205WYRZ-R7?
The typical supply voltage is 5 V, with a range from 4.5 V to 10 V and an absolute maximum of 12.5 V.
- How does the AD8205WYRZ-R7 handle input voltages that exceed the supply voltage?
The device uses input attenuators to reduce the common-mode voltage, ensuring the amplifier inputs remain within the power supply range even if the input voltages exceed the supply or fall below common (ground).
- What are some common applications of the AD8205WYRZ-R7?
Common applications include high-side current sensing in motor controls, transmission controls, diesel injection controls, engine management, suspension controls, and DC-to-DC converters.
- Is the AD8205WYRZ-R7 qualified for automotive applications?
- What is the package type of the AD8205WYRZ-R7?
The AD8205WYRZ-R7 is available in an 8-lead SOIC package.
