OPA350UA/2K5

The Texas Instruments OPA350UA/2K5 is a high-speed, rail-to-rail CMOS operational amplifier optimized for low-voltage single-supply operation. Part of the MicroAmplifier series, it delivers a 38MHz gain-bandwidth product and 22V/us slew rate while consuming only 5.2mA per amplifier. The rail-to-rail input and output capability allows the amplifier to operate with signals that extend to the power supply rails, making it ideal for driving analog-to-digital converters. The very low input bias current of 0.5pA and low noise of 5nV/sqrt(Hz) ensure precision in high-impedance sensor applications. The device is unity-gain stable and available in tape and reel packaging for automated assembly.

The OPA350 operates as a voltage-feedback operational amplifier with three key subsystems: 1) Input Stage: A CMOS differential input pair provides rail-to-rail common-mode voltage range, from 0.1V below the negative rail to 0.1V above the positive rail, with ultra-low bias current of 0.5pA. 2) Gain Stage: The high-gain voltage amplifier stage achieves 122dB open-loop gain (RL=10k), providing excellent DC precision with only 150uV input offset voltage. 3) Output Stage: A rail-to-rail CMOS output stage swings within 10mV of the supply rails with a 10k load and can drive up to 40mA, making it suitable for driving low-impedance loads including 75-ohm video lines.

• High-impedance sensor signal conditioning and ADC driver circuits
• Portable and battery-powered medical instrumentation
• Audio signal processing with 0.0006% THD+N
• Video signal processing with 75-ohm drive capability
• Cell phone power amplifier control loops