OPA2134 Pinout, Datasheet, Equivalent, and OPA2134 vs. NE5532

The OPA134 series consists of ultra-low distortion, low-noise operational amplifiers that are fully specified for audio applications. They feature a true FET input stage for superior sound quality and speed, ensuring exceptional audio performance. Coupled with high output drive capability and excellent DC performance, these amplifiers are suitable for a wide range of demanding applications. Additionally, the OPA134 offers a wide output swing, allowing it to operate within 1V of the rails. This feature provides increased headroom, making it ideal for use in any audio circuit.

The OPA2134 is a high-performance audio operational amplifier (op-amp) known for its exceptional audio quality and versatility. It is part of the OPAx134 series of op-amps designed by Texas Instruments for use in audio applications where high fidelity and low distortion are critical. In this article, we'll delve into the OPA2134 op-amp, exploring its pinout, circuit, features, applications, datasheet, etc, and the difference between OPA2134 and NE5532.

What is OPA2134?

The OPA2134 is an operational amplifier designed for audio applications, offering low noise and ultra-low distortion. Its real FET input stage enhances sound quality and speed, ensuring exceptional audio performance. With high output drive capabilities and good DC performance, it suits a wide range of demanding applications. The OPA2134 also features a wide output swing, operating within 1V of the rails, providing more headroom and making it ideal for any audio circuit.

The single and dual versions are available in 8-pin DIP and SO-8 surface-mount packages, while the quad version comes in 14-pin DIP and SO-14 surface-mount packaging. All variants are rated for temperatures ranging from –40°C to 85°C. Additionally, a SPICE macro model is available for design analysis.

OPA2134 Pinout

Pin Configuration

Pin No.	Pin Name	Description
1	Out A	Output of Op-Amp A
2	Inverting Input A	Inverting Input of Op-Amp A
3	NON-Inverting Input A	Non Inverting Input of Op-Amp A
4	V-	Ground or Negative(Dual Polarity Supply)
5	NON-Inverting Input B	Non Inverting Input of Op-Amp B
6	Inverting Input B	Inverting Input of Op-Amp B
7	Output B	Output of Op-Amp B
8	V+	Supply Voltage

Features of OPA2134

• Superior Sound Quality: The OPA2134 is designed to deliver excellent sound quality, making it ideal for audio applications where fidelity is critical.

• Ultra-Low Distortion: With a distortion level of just 0.00008%, the OPA2134 ensures that audio signals remain clean and undistorted.

• Low Noise: The amplifier has a low noise level of 8 nV/√Hz, ensuring that the signal-to-noise ratio is optimized for high-quality audio reproduction.

• True FET-Input: The OPA2134 features a true FET-input design with a bias current (IB) of only 5pA, minimizing input current noise for improved audio performance.

• High Speed: The amplifier offers high-speed operation with a slew rate of 20 V/µs and a bandwidth of 8 MHz, enabling it to handle fast-changing audio signals with ease.

• High Open-Loop Gain: With an open-loop gain of 120 dB (600 Ω), the OPA2134 provides high gain accuracy and stability over a wide range of frequencies.

• Supply Range: The amplifier can operate from a dual supply voltage range of ±2.5 V to ±18 V, offering flexibility in various audio system configurations.

• Single, Dual, and Quad Versions: The OPA2134 is available in single, dual, and quad versions, providing options for different channel configurations in audio systems.

OPA2134 Specifications

Type	Parameter
Supply Voltage	15V
Voltage - Supply, Single/Dual (±)	5V~36V ±2.5V~18V
Operating Supply Voltage	36V
Operating Supply Current	4mA
Nominal Supply Current	10mA
Slew Rate	20V/μs
Common Mode Rejection Ratio	86 dB
Current - Input Bias	5pA
Output Current per Channel	35mA
Input Offset Voltage (Vos)	2mV
Neg Supply Voltage-Nom (Vsup)	-15V
Unity Gain BW-Nom	8000 kHz
Voltage Gain	120dB
Voltage - Input Offset	500μV
Operating Temperature	-40°C~85°C
Package / Case	8-DIP

OPA2134 Equivalents

The OPA2134 operational amplifier is a high-performance component known for its superior audio quality and versatility. While it has unique characteristics that set it apart, several equivalents can be used as substitutes in various applications:

• TL074: The TL074 is a quad JFET-input operational amplifier that offers similar performance to the OPA2134. It is suitable for applications requiring multiple amplifiers in a single package.

• TL072: The TL072 is a dual JFET-input operational amplifier that provides performance similar to the OPA2134. It is commonly used in audio applications where a dual amplifier configuration is required.

• LM358: The LM358 is a dual-operational amplifier with low power consumption and a wide supply voltage range. While less high-performance than the OPA2134, it is suitable for less demanding audio applications.

• LM338: The LM338 is a voltage regulator that is not directly equivalent to the OPA2134. It provides a stable voltage output and is not typically used as an audio amplifier.

OPA2134 CAD Model

OPA2134 Functional Block Diagram

Where to use OPA2134

The OPA2134 is a dual-package operational amplifier, which means it contains two independent Op-Amps.

The key feature of the OPA2134 Op-Amp is its ultra-low distortion and low-noise design, specifically tailored for audio applications. It incorporates a true FET input stage to ensure superior sound quality and speed, leading to exceptional audio performance. This, coupled with its high output drive capability and excellent DC performance, makes it suitable for a wide range of demanding applications. Furthermore, the OPA134 offers a wide output swing, operating within 1V of the rails, providing increased headroom and making it an ideal choice for any audio circuit.

How to use OPA2134

This IC can be utilized for audio pre-amplification, offering a competitive edge in sound quality given its cost relative to its specifications. For demonstration, a non-inverting op-amp configuration is depicted below.

In this configuration, the OPA2134 Op-amp is set up as a non-inverting amplifier with a gain of 10. This is achieved using a 1K resistor and a 9.1K resistor. In the simulation, a variable potentiometer is employed to vary the input voltage, resulting in a corresponding change in the output voltage. The op-amp is powered using a +12V and -12V supply. Since the op-amp has a gain of 10, providing 1V at the input yields 10V at the output, which is accurately demonstrated in the simulated circuit.

OPA2134 Special Features

The OPA Sound Plus audio operational amplifiers are user-friendly and address phase-inversion and overload issues commonly encountered in typical FET-input operational amplifiers. They can function with power supplies ranging from ±2.5V to ±18V. The input cascade circuitry ensures exceptional common-mode rejection and maintains low input bias current across a wide input voltage range, minimizing distortion. The OPA134 series operational amplifiers are unity-gain stable and exhibit excellent dynamic behavior under various load conditions, including high load capacitance. The dual and quad versions feature completely independent circuitry for minimal crosstalk and no interaction, even under overdriven or overloaded conditions. The graph below illustrates the relationship between Total Harmonic Distortion, Noise, and Frequency.

For applications requiring additional adjustment, the OPA314 device offers an extra trim facility that may prove beneficial.

OPA2134 Applications

• Professional Audio and Music: The OPA2134 is commonly used in professional audio equipment such as mixers, amplifiers, and recording devices due to its high audio quality and low noise performance.

• Line Drivers: In audio and communication systems, the OPA2134 can be used as a line driver to boost signal levels and drive signals over long distances without significant loss or distortion.

• Line Receivers: The OPA2134 can also be used as a line receiver to amplify and process incoming signals, making it useful in applications such as data communication and audio equipment.

• Multimedia Audio: The OPA2134 can be used for audio processing and amplification in multimedia systems such as home theater systems and sound cards, providing clear, high-quality sound reproduction.

• Active Filters: The OPA2134's high precision and low noise make it suitable for use in active filter circuits, where it can be used to design filters with specific frequency responses for audio and signal processing applications.

• Preamplifiers: The OPA2134 is well-suited for use in preamplifier circuits, where it can amplify weak signals from microphones, instruments, or other sources before further processing or amplification.

• Integrators: In electronic circuits requiring the integration of signals over time, such as in control systems or measurement devices, the OPA2134 can be used as an integrator to perform this function accurately and reliably.

OPA2134 OP-Amp Design Considerations

When using the OPA2134 in your circuit designs, it's essential to consider several factors to ensure optimal performance and reliability. Here are some key design considerations:

1. PCB Layout Guidelines:

• Keep the op-amp close to the components it interacts with to minimize trace lengths and reduce noise pickup.

• Use a ground plane for low impedance paths to minimize ground loops and interference.

• To reduce voltage fluctuations, place decoupling capacitors (typically 100nF) close to the OPA2134's power supply pins.

2. Thermal Considerations:

• The OPA2134 can generate heat during operation, especially at high output levels or in high ambient temperatures.

• Provide adequate ventilation or heat sinking to dissipate heat and prevent the op-amp from overheating.

3. Protection Circuitry:

• Consider adding protection circuitry, such as overvoltage and reverse voltage protection, to safeguard the OPA2134 from damage due to external faults.

• Use diodes to protect against ESD (electrostatic discharge) and overvoltage conditions.

By carefully considering these design aspects, you can ensure that the OPA2134 operates reliably and delivers the desired performance in your circuit applications.

OPA2134 Package

OPA2134 Manufacturer

Texas Instruments is a leading global semiconductor company that designs and manufactures a wide range of analog and digital integrated circuits. With a focus on innovation and quality, Texas Instruments provides solutions for a variety of industries, including automotive, industrial, consumer electronics, and communications. The company's product portfolio includes microcontrollers, power management ICs, amplifiers, and data converters, among others. Texas Instruments is known for its commitment to sustainability and corporate responsibility, striving to create a positive impact on society and the environment through its products and practices.

OPA2134 Datasheet

Download OPA2134 Datasheet PDF.

OPA2134 vs. NE5532

Feature	OPA2134	NE5532
Input Type	Fet Input	Bipolar Input
Performance	High performance, suitable for high-end audio systems	Adequate for most applications, commonly used in audio equipment
Replacement	Yes, modern alternative	Still used in many applications
Versatility	Suitable for low-frequency filters	Versatile, can be used in various audio applications
Application	Audio	Audio

The OPA2134 is a Fet Input op-amp known for its high performance and suitability for high-end audio systems. It is commonly used as a modern alternative in audio applications where a Fet Input op-amp is required.

On the other hand, the NE5532 is a Bipolar Input op-amp that, despite being considered obsolete by some, is still widely used in many applications, especially in audio equipment. It is known for its versatility and can be used in various audio applications.

In general, if a bipolar op-amp is suitable for your application, the NE5532 is a cost-effective and reliable choice. However, if a Fet Input op-amp is required, the OPA2134 is a better alternative to the NE5532.

Related Read: NE5532 Features

Conclusion

In conclusion, the OPA2134 operational amplifier stands out as a versatile and high-performance component for various electronic circuits. Its exceptional audio fidelity, low noise, and wide bandwidth make it ideal for audio applications, instrumentation, and precision voltage amplification.

The OPA2134's significance in electronic circuits lies in its ability to deliver exceptional audio quality and precise signal amplification, making it a preferred choice among audio enthusiasts and professionals alike. Its versatility and reliability make it a valuable asset in a wide range of applications, from audio equipment to medical devices and industrial control systems.

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