OPA2134PA High-Performance Audio Operational Amplifier

Overview

The OPA2134PA is a high-performance, ultra-low distortion, low-noise operational amplifier designed for professional audio applications. Part of the OPA134 series, this dual-channel amplifier delivers superior sound quality with true FET-input architecture, making it ideal for high-fidelity audio systems, mixing consoles, and precision signal processing. The device operates over a wide supply range (±2.5V to ±18V) and offers exceptional speed, low noise, and ultra-low distortion characteristics.

Features

• Superior Sound Quality: Optimized for high-fidelity audio applications.
• Ultra-Low Distortion: 0.00008% THD+N ensures pristine signal reproduction.
• Low Noise: 8nV/√Hz noise density for clean signal amplification.
• True FET-Input: Input bias current of just 5pA minimizes loading effects.
• High Speed: Slew rate of 20V/µs and bandwidth of 8MHz for dynamic audio signals.
• High Open-Loop Gain: 120dB (600Ω) ensures accurate amplification.
• Wide Supply Range: Operates from ±2.5V to ±18V, suitable for various audio systems.
• Versatile Packaging: Available in single (OPA134), dual (OPA2134PA), and quad (OPA4134) versions.

Applications

The OPA2134PA is designed for high-end audio and precision analog applications, including:

• Professional Audio Equipment: Mixing consoles, preamplifiers, and headphone amplifiers.
• Hi-Fi Systems: Phonograph preamps, DAC output stages, and active crossovers.
• Instrumentation: Precision signal conditioning and medical audio devices.
• Broadcast Equipment: Microphone preamps and line drivers.
• Active Filters: Low-noise, high-accuracy filter designs.

Electrical Characteristics

The following table summarizes the key electrical specifications of the OPA2134PA (typical values at ±15V, 25°C unless otherwise noted):

• Input Offset Voltage: 1mV (max)
• Input Bias Current: 5pA
• Input Voltage Noise: 8nV/√Hz (at 1kHz)
• THD+N (Total Harmonic Distortion + Noise): 0.00008% (1kHz, 2V_RMS, 600Ω)
• Slew Rate: 20V/µs
• Gain Bandwidth Product: 8MHz
• Common-Mode Rejection Ratio (CMRR): 100dB
• Supply Voltage Range: ±2.5V to ±18V
• Quiescent Current (per channel): 4mA

Package Information

The OPA2134PA is available in an 8-pin PDIP (Plastic Dual In-Line Package), which is widely used for prototyping and through-hole PCB assembly. Key package details include:

• Package Type: 8-Pin PDIP
• Dimensions: 9.81mm x 6.35mm (0.386" x 0.250")
• Pin Configuration:
  • Pin 1: Output A
  • Pin 2: Inverting Input A
  • Pin 3: Non-Inverting Input A
  • Pin 4: V- (Negative Supply)
  • Pin 5: Non-Inverting Input B
  • Pin 6: Inverting Input B
  • Pin 7: Output B
  • Pin 8: V+ (Positive Supply)
• Operating Temperature Range: -40°C to +85°C
• RoHS Compliance: Yes

Design Considerations

When designing with the OPA2134PA, consider the following best practices to maximize performance:

• Power Supply Decoupling: Use low-ESR capacitors (0.1µF ceramic) close to the supply pins to minimize noise.
• PCB Layout: Keep analog signal traces short and away from high-frequency digital lines to reduce interference.
• Thermal Management: Although the PDIP package has moderate thermal resistance, ensure adequate airflow in high-power applications.
• Input Protection: For high-impedance FET inputs, avoid excessive voltage differentials to prevent latch-up.

Conclusion

The OPA2134PA is a premium audio operational amplifier that combines ultra-low distortion, low noise, and high-speed performance in a versatile dual-channel package. Its FET-input architecture and wide supply range make it an excellent choice for professional audio systems, precision instrumentation, and high-end consumer audio applications. With robust electrical characteristics and reliable packaging, the OPA2134PA stands out as a top-tier solution for demanding analog designs.