The OPA128 is a precision, ultra-low input bias current operational amplifier from Burr-Brown (now Texas Instruments). It's designed for applications requiring extremely low leakage currents and high input impedance, such as electrometer amplifiers, pH meters, and other high-impedance sensor interfaces.

Applications

• Electrometer Amplifiers: Amplifying extremely small currents in scientific instruments.
• pH Meters: Measuring the pH of solutions using high-impedance electrodes.
• Photodiode Amplifiers: Amplifying the current from photodiodes in light detection systems.
• High-Impedance Sensor Interfaces: Interfacing with sensors that have very high output impedance.
• Data Acquisition Systems: Used in front-end stages to minimize errors due to input bias current.

Features

• Ultra-Low Input Bias Current: Minimizes errors caused by input leakage current.
• High Input Impedance: Presents a minimal load to the signal source.
• Low Noise: Provides low-noise amplification for sensitive signals.
• Low Offset Voltage: Minimizes errors due to offset voltage.
• High Open-Loop Gain: Provides high amplification of input signals.

Benefits

• High Accuracy: Enables precise measurement of small signals.
• Low Error: Minimizes errors caused by input bias current and offset voltage.
• Sensitive Signal Amplification: Allows amplification of very weak signals.

Technical Specifications

The OPA128 requires careful handling due to its sensitive input circuitry. Refer to the datasheet for detailed specifications including input bias current, input impedance, offset voltage, and noise characteristics.