Overview
The AD8202, produced by Analog Devices Inc., is a single-supply difference amplifier designed for amplifying and low-pass filtering small differential voltages in the presence of large common-mode voltages. This component is particularly suited for automotive and industrial applications where precision and robustness are critical. The AD8202 operates over a wide temperature range from −40°C to +125°C, making it ideal for various harsh environments.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Temperature Range | −40 | +125 | °C | |
| Supply Voltage Range | 3.5 | 12 | V | |
| Quiescent Current | 0.25 | 1.0 | mA | |
| Common-Mode Rejection Ratio (CMRR) | 80 | dB (dc to 10 kHz) | ||
| Gain Drift | 1 | ppm/°C | ||
| Input Offset Voltage Drift | 0.3 | µV/°C | ||
| Slew Rate | 0.28 | V/µs | ||
| Input Bias Current | 40 | nA | ||
| Power Supply Rejection Ratio (PSRR) | 75 | 83 | dB |
Key Features
The AD8202 features several key attributes that make it highly suitable for its intended applications:
- High Common-Mode Voltage Range: The input common-mode voltage range extends from −6 V to +28 V at a typical supply voltage of 5 V.
- Low-Pass Filtering Capability: The device includes an externally accessible 100 kΩ resistor at the output of the preamp, allowing for low-pass filtering and gain adjustment.
- Two-Stage System Architecture: This architecture enables the incorporation of a low-pass filter prior to the output buffer, allowing for a full-scale, rail-to-rail signal to be filtered and then restored to full scale by the output buffer amplifier.
- High Accuracy and Stability: The AD8202 offers excellent ac and dc performance, with low offset and gain drift, ensuring minimal errors in the user’s system.
- Robust Temperature Range: The component is specified for operation from −40°C to +125°C, making it suitable for harsh automotive and industrial environments.
Applications
The AD8202 is designed for various applications that require the extraction of small differential signals in the presence of large common-mode voltages. Key applications include:
- Automotive Systems: Transmission control, diesel injection control, engine management, adaptive suspension control, and vehicle dynamics control.
- Industrial Control Systems: High-line current sensing, power device monitoring, and other industrial control applications where precision and robustness are essential.
Q & A
- What is the operating temperature range of the AD8202?
The AD8202 operates over a temperature range from −40°C to +125°C.
- What is the supply voltage range for the AD8202?
The supply voltage range for the AD8202 is from 3.5 V to 12 V.
- What is the common-mode rejection ratio (CMRR) of the AD8202?
The CMRR of the AD8202 is a minimum of 80 dB from dc to 10 kHz.
- What is the gain drift of the AD8202?
The gain drift of the AD8202 is typically 1 ppm/°C.
- Can the AD8202 be used for low-pass filtering?
Yes, the AD8202 includes an externally accessible 100 kΩ resistor that can be used for low-pass filtering and gain adjustment.
- What is the slew rate of the AD8202?
The slew rate of the AD8202 is 0.28 V/µs.
- What is the input bias current of the AD8202?
The input bias current of the AD8202 is typically 40 nA.
- What are some typical applications of the AD8202?
The AD8202 is typically used in automotive systems such as transmission control, diesel injection control, and engine management, as well as in industrial control systems.
- What is the power supply rejection ratio (PSRR) of the AD8202?
The PSRR of the AD8202 is between 75 dB and 83 dB.
- What package types are available for the AD8202?
The AD8202 is available in MSOP and SOIC packages.
