OPA228U/2K5

The OPA228U/2K5 is a precision operational amplifier (op-amp) manufactured by Texas Instruments. It is designed for high-performance applications requiring low noise, low distortion, and high accuracy. Here’s a detailed description of its key features and specifications:

General Characteristics:

• Type: Precision Operational Amplifier
• Package: The OPA228U comes in a standard 8-pin SOIC (Small Outline Integrated Circuit) package, which is compact and suitable for surface-mount applications.
• Temperature Range: It operates over an extended temperature range, typically from -40°C to +125°C, making it suitable for industrial and automotive applications.

Electrical Specifications:

• Supply Voltage: The OPA228 can operate with a dual supply voltage ranging from ±2.5V to ±18V, or a single supply from 5V to 36V, providing flexibility in various circuit designs.
• Input Offset Voltage: It features a low input offset voltage, typically around 50 µV, which is crucial for applications requiring high precision.
• Input Bias Current: The input bias current is low, typically around 10 pA, minimizing errors in high-impedance applications.
• Common-Mode Rejection Ratio (CMRR): The CMRR is high, typically around 120 dB, ensuring that variations in the input common-mode voltage have minimal effect on the output.
• Power Supply Rejection Ratio (PSRR): The PSRR is also high, typically around 120 dB, which helps maintain stable performance despite variations in supply voltage.

Performance Features:

• Gain Bandwidth Product: The OPA228 has a gain bandwidth product of approximately 8 MHz, allowing it to handle a wide range of frequencies while maintaining stability.
• Slew Rate: The slew rate is around 0.5 V/µs, which is adequate for many applications, though it may not be suitable for very high-speed signals.
• Total Harmonic Distortion (THD): The op-amp exhibits low total harmonic distortion, typically around 0.0005%, making it ideal for audio and other sensitive signal processing applications.

Applications:

The OPA228U/2K5 is well-suited for a variety of applications, including:

• Precision signal conditioning
• Data acquisition systems
• Medical instrumentation
• Audio processing
• Active filters
• Transducer interfacing

Additional Features:

• Rail-to-Rail Output: The output stage is designed to provide rail-to-rail output swing, maximizing the dynamic range of the amplifier.
• Low Noise: The op-amp is designed to minimize noise, making it suitable for low-level signal amplification.
• High Input Impedance: The high input impedance reduces loading effects on the preceding stage, which is particularly important in sensor applications.

Conclusion:

The OPA228U/2K5 from Texas Instruments is a versatile and high-performance operational amplifier that excels in precision applications. Its combination of low noise, low distortion, and high accuracy makes it a preferred choice for engineers designing sensitive electronic circuits.