The TL084C is a high-speed, quadruple operational amplifier that combines high-voltage JFETs and bipolar transistors in a single monolithic integrated circuit. It is designed to provide high slew rates, low input bias, and low offset currents. Because it contains four independent op-amps in one SOIC-14 package, it is a highly efficient choice for complex signal processing, active filters, and multi-channel audio applications.

Specifications

• Supply Voltage: ±3V to ±18V (Dual Rail) or 6V to 36V (Single Rail)
• Slew Rate: 13V/us (Typical)
• Gain Bandwidth Product: 3MHz
• Input Bias Current: 30pA (Typical)
• Input Offset Voltage: 3mV (Typical)
• Low Harmonic Distortion: 0.003% (Typical)
• Package: SOIC-14 (Surface Mount)

Features

• Quad Configuration: Four independent operational amplifiers in a single footprint, significantly reducing PCB space and component count.
• High Input Impedance: The JFET input stage ensures extremely low input bias and offset currents, making it ideal for interfacing with high-impedance sensors.
• Fast Response: The 13V/us slew rate allows the amplifier to follow rapid signal changes with high fidelity, essential for audio and pulse applications.
• Internal Frequency Compensation: Each amplifier is internally compensated for stable operation without the need for external capacitors.
• Low Power Consumption: Designed for efficient operation while maintaining high-speed performance.

Common Applications

• Active Filters: Implementing multi-stage Butterworth or Chebyshev filters (Low-pass, High-pass, Band-pass).
• Audio Mixers: Handling multiple audio input channels with low noise and crosstalk.
• Data Acquisition: Buffering and conditioning signals from multiple sensors before ADC conversion.
• Integrators and Summing Amplifiers: Performing mathematical operations on multiple signal lines.
• Instrumentation: Precision gain stages in measurement devices.

Usage Tips

• Bypass Capacitors: To ensure stability and reduce noise, place 0.1uF ceramic capacitors between the VCC+ and VCC- pins as close to the IC package as possible.
• Phase Reversal: Like many JFET op-amps, care should be taken to ensure the input common-mode voltage does not drop too close to the negative supply rail, which can cause output phase reversal.
• Unused Amplifiers: If any of the four amplifiers are not used, it is best practice to connect them as a voltage follower (output tied to inverting input) with the non-inverting input tied to a stable voltage (like ground or half-supply) to prevent oscillations.
• Thermal Consideration: While the TL084C is efficient, using all four channels at high speed and high load can generate heat; ensure adequate PCB copper for heat dissipation.

Datasheet