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OPA134 Ultra-Low Distortion, Low-Noise Operational Amplifier

Overview

The OPA134 series represents a family of ultra-low distortion, low-noise operational amplifiers designed for high-performance audio and precision analog applications. These devices combine excellent audio quality with precision DC performance, making them ideal for demanding professional audio equipment, medical instrumentation, and high-end consumer audio products.

Built using Burr-Brown's proprietary dielectric-isolation (DI) process technology, the OPA134 achieves unprecedented levels of audio performance while maintaining excellent DC precision. The series is available in single (OPA134), dual (OPA2134), and quad (OPA4134) configurations to suit various application requirements.

Key Features

Ultra-low distortion: 0.00008% at 1kHz
Low noise: 8nV/√Hz at 1kHz
High slew rate: 20V/µs
Wide bandwidth: 8MHz
Low input bias current: ±10pA max
Wide supply range: ±2.5V to ±18V
Excellent DC precision: 1mV max offset voltage
Available in single, dual, and quad versions
Industry-standard pinouts

Applications

The OPA134's exceptional performance characteristics make it suitable for a wide range of professional and high-end applications:

Professional Audio Equipment

Microphone preamplifiers
Mixing consoles
Equalizers and tone controls
Analog effects processors
High-end AD/DA converters

Consumer Audio

High-fidelity preamplifiers
Phono stages
Headphone amplifiers
Active crossover networks
Premium audio components

Medical and Instrumentation

ECG amplifiers
Medical imaging equipment
Precision strain gauge amplifiers
Laboratory instrumentation
Sensor signal conditioning

Electrical Characteristics

The following table summarizes the key electrical specifications at V_S = ±15V, T_A = 25°C unless otherwise noted:

DC Characteristics

Input Offset Voltage: 0.5mV (typ), 1mV (max)
Input Offset Voltage Drift: 2µV/°C (typ)
Input Bias Current: ±2pA (typ), ±10pA (max)
Input Noise Voltage: 8nV/√Hz at 1kHz
Input Noise Current: 0.6fA/√Hz at 1kHz
Common Mode Rejection Ratio: 100dB (typ)
Power Supply Rejection Ratio: 100dB (typ)

AC Characteristics

Gain Bandwidth Product: 8MHz (typ)
Slew Rate: 20V/µs (typ)
THD+N: 0.00008% at 1kHz, G=1
Settling Time to 0.01%: 1µs for 10V step
Output Current: ±30mA (min)

Power Requirements

Supply Voltage Range: ±2.5V to ±18V
Quiescent Current: 4mA per amplifier (typ)
Power Dissipation: 100mW (typ)

Package Information

The OPA134 series is available in multiple package options to accommodate different application requirements:

Single Version (OPA134)

8-pin DIP (Plastic)
8-pin SOIC (Surface Mount)
TO-99 Metal Can (for highest performance)

Dual Version (OPA2134)

8-pin DIP (Plastic)
8-pin SOIC (Surface Mount)
8-pin MSOP (Mini Small Outline Package)

Quad Version (OPA4134)

14-pin DIP (Plastic)
14-pin SOIC (Surface Mount)
16-pin SSOP (Shrink Small Outline Package)

Design Considerations

To achieve optimal performance from the OPA134 series, consider the following design guidelines:

Power Supply Bypassing

Proper power supply bypassing is critical for achieving the lowest noise and distortion performance. Use 0.1µF ceramic capacitors located as close as possible to the amplifier power pins, with larger bulk capacitors (10µF tantalum or electrolytic) for each supply rail.

PCB Layout

Implement careful PCB layout practices including:

Minimize trace lengths for critical signal paths
Use ground planes for improved noise immunity
Keep high-impedance nodes as small as possible
Separate analog and digital grounds

Thermal Considerations

While the OPA134 has modest power requirements, thermal management becomes important in high-density designs or elevated ambient temperatures. Ensure adequate airflow and consider thermal relief patterns for surface mount packages.

Conclusion

The OPA134 series operational amplifiers set a new standard for audio performance in precision analog circuits. With their combination of ultra-low distortion, low noise, and excellent DC characteristics, these devices enable designers to achieve professional-grade audio quality in a wide range of applications. The availability in single, dual, and quad versions provides flexibility for system design while maintaining consistent performance across all configurations.

Whether used in professional recording equipment, high-end consumer audio, or precision instrumentation, the OPA134 delivers performance that meets the most demanding requirements while simplifying design implementation through its robust architecture and stable operation.