LM2904DR,TI,Precision Dual Channel Operational Amplifier Chip

ymn@deirchip.com

·February 23, 2025

·13 min read

LM2904DR,TI,Precision Dual Channel Operational Amplifier Chip

The LM2904DR is a dual-channel operational amplifier designed to deliver precision and efficiency in your circuits. Its low power consumption makes it ideal for battery-powered devices, while its versatility supports a wide range of applications, from signal amplification to voltage comparison. With a compact design and the ability to operate across a broad voltage range (3V to 32V), this chip enhances performance in modern electronics. Whether you're working on audio processing or embedded system projects, the LM2904DR ensures stability and accuracy, making it a reliable choice for precision analog signal processing.

Key Takeaways

The LM2904DR is a chip with two amplifiers. It processes two signals at once, using fewer parts in circuits.
It uses very little power, only 0.7mA. This makes it great for battery devices, helping them last longer and stay steady.
The chip works with voltages from 3V to 36V. This makes it useful for many things like sound systems and comparing voltages.
Its strong signal boost helps make sounds and sensor signals clearer.
Pick the right LM2904DR type for your project. Think about its size and power needs to get the best results.

Key Features and Specifications of the LM2904DR

Dual-Channel Design and Efficiency

The LM2904DR features a dual-channel design that allows you to process two signals simultaneously. This capability reduces the number of components required in your circuit, leading to lower power consumption and improved efficiency. By integrating two operational amplifiers into a single chip, the LM2904DR simplifies circuit design and enhances performance. This design is particularly beneficial for applications where space and power management are critical, such as portable devices and embedded systems.

Tip: Using a dual-channel operational amplifier like the LM2904DR can help you streamline your circuit layout and reduce energy waste.

Low Power Consumption and Stability

The LM2904DR is engineered for minimal power usage, making it ideal for power-sensitive applications. With a quiescent current of approximately 0.7mA, this chip ensures efficient energy management, which is essential for battery-powered devices. Despite its low power consumption, the LM2904DR maintains high stability, even in noise-sensitive environments. Its high common-mode rejection ratio (CMRR) enhances accuracy, ensuring reliable performance in various conditions.

This operational amplifier also employs an efficient power management strategy that minimizes energy waste while maintaining optimal functionality. As a result, you can extend the lifespan of your devices and improve overall circuit reliability.

Technical Specifications Overview

The LM2904DR offers a wide range of technical specifications that make it versatile for different applications. Below is a summary of its key specifications:

Specification	Value
Operating Temperature Range	-40°C to 125°C
Voltage Range	3V to 36V

These specifications highlight the chip's ability to operate under diverse conditions, making it suitable for both industrial and consumer electronics. Its wide voltage range supports various circuit designs, while its robust temperature tolerance ensures consistent performance in extreme environments.

Benefits of Using the LM2904DR in Circuits

The LM2904DR offers several advantages that make it a valuable addition to your circuit designs. Its unique features and performance capabilities set it apart from similar components, ensuring efficiency and reliability in various applications.

One of the key benefits of the LM2904DR is its low power consumption. With a quiescent current of approximately 0.7mA, this operational amplifier consumes significantly less energy than alternatives like the LM358 or LM324. This feature makes it ideal for battery-powered devices, as it helps extend their operational time. You can rely on this chip to deliver consistent performance without draining your power supply.

Another advantage lies in its high gain-bandwidth product. This characteristic allows the LM2904DR to maintain high gain over a wide frequency range, which is essential for effective signal amplification and filtering. Whether you are working on audio processing or sensor signal conditioning, this chip ensures accurate and stable results. Its high common-mode rejection ratio (CMRR) further enhances stability, making it suitable for noise-sensitive environments.

The LM2904DR also stands out for its versatility. It supports a wide range of applications, including power management, voltage monitoring, and automatic control circuits. You can use it as a comparator, an active filter, or even in battery management systems. This adaptability makes it a go-to choice for engineers and designers looking to simplify their circuit designs.

Despite its high performance, the LM2904DR remains competitively priced. Its affordability, combined with its availability, ensures that you can easily source it for your projects. This combination of cost-effectiveness and functionality makes it a preferred option for both beginners and professionals.

By choosing the LM2904DR, you gain access to a reliable and efficient component that enhances your circuit's performance. Its precision, stability, and adaptability make it an excellent choice for a wide variety of applications.

Practical Applications of the LM2904DR

Signal Amplification in Audio and Sensors

The LM2904DR excels in amplifying weak signals, making it a vital component in audio and sensor systems. Its high gain-bandwidth product ensures consistent gain across a wide frequency range, preserving signal integrity. This feature is crucial for applications like analog signal acquisition, where accurate signal processing is essential. Additionally, the chip’s high common-mode rejection ratio (CMRR) suppresses noise, enhancing stability and accuracy. Whether you’re designing a circuit for audio processing or sensor-based systems, this operational amplifier ensures reliable performance.

Voltage Comparator Applications

The LM2904DR is highly effective in voltage comparator circuits. It consumes minimal power, with a quiescent current of approximately 0.7mA, making it ideal for battery-powered devices. Its high gain-bandwidth product allows precise signal amplification and filtering, while the high CMRR minimizes noise interference. These features make it suitable for measuring voltages in industrial automation and consumer electronics. For example, you can use it to compare input voltages in power management systems or automatic control circuits. Its efficiency and accuracy make it a preferred choice for real-world applications requiring precise voltage monitoring.

Active Filters for Noise Reduction

Active filters designed with the LM2904DR help reduce noise in circuits. Its high gain and wide voltage range allow you to create effective low-pass, high-pass, or band-pass filters. These filters are essential for applications like data acquisition and transmission, where clean signals are critical. By integrating this chip into your circuit, you can achieve superior noise reduction and improve overall signal quality. For example, you can use it to design an active low-pass filter to eliminate high-frequency noise in audio systems. Its versatility ensures it meets the demands of various filtering applications.

How to Integrate the LM2904DR into a Circuit

Pin Configuration and Functions

Understanding the pin configuration of the LM2904DR is essential for proper integration into your circuit. This operational amplifier features eight pins, each serving a specific purpose. The table below outlines the pin functions:

PIN	NAME	TYPE	DESCRIPTION
1	OUTA	O	Output, Channel A
2	-INA	I	Inverting Input, Channel A
3	+INA	I	Non-Inverting Input, Channel A
4	GND/V-	P	Ground for single-supply configurations, negative supply for dual supplies
5	+INB	I	Non-Inverting Input, Channel B
6	-INB	I	Inverting Input, Channel B
7	OUTB	O	Output, Channel B
8	V+	P	Positive Supply

You can use this configuration to connect the LM2904DR correctly and ensure optimal performance in your application.

Step-by-Step Circuit Integration

To integrate the LM2904DR into your circuit, follow these steps:

Power Supply Connection: Connect pin 8 (V+) to the positive voltage supply and pin 4 (GND/V-) to the ground or negative voltage supply, depending on your configuration. Ensure the supply voltage stays within the 3V to 36V range.
Input Connections: Attach the signal you want to amplify or measure to the appropriate input pins. Use pin 2 (-INA) for the inverting input and pin 3 (+INA) for the non-inverting input of Channel A. For Channel B, use pins 6 (-INB) and 5 (+INB).
Output Connections: Connect the output pins (1 for Channel A and 7 for Channel B) to the next stage of your circuit, such as a load or another processing component.
Feedback Network: Add resistors or capacitors between the input and output pins to set the desired gain or filtering characteristics.

Testing and Troubleshooting Techniques

After assembling your circuit, test it to ensure proper functionality. Begin by measuring the supply voltage at pins 8 and 4 to confirm it matches your design. Next, apply a known input signal and measure the output voltage. Verify that the gain matches your calculations. If the output deviates, check the feedback network and input connections for errors. Use an oscilloscope to observe the signal and identify noise or instability. Adjust the circuit as needed to achieve the desired performance.

Real-World Use Cases of the LM2904DR

Audio Amplifier Circuit Design

You can use the LM2904DR to design efficient audio amplifier circuits. Its high gain-bandwidth product ensures clear signal amplification, making it ideal for audio processing. By connecting the input signal to the non-inverting input pin, you can amplify weak audio signals without distortion. The chip’s low power consumption also makes it suitable for portable audio devices. Adding a feedback resistor between the output and inverting input pins allows you to control the gain of the circuit. This setup ensures consistent performance across a wide range of input voltages. Whether you’re building a headphone amplifier or a speaker system, the LM2904DR delivers reliable results.

Tip: Use capacitors to filter out unwanted noise from the input signal for better audio clarity.

Sensor Signal Conditioning Example

The LM2904DR excels in sensor signal conditioning applications. Many sensors produce weak analog signals that require amplification before processing. By connecting the sensor’s output to the chip’s non-inverting input, you can amplify the signal to a usable level. The LM2904DR’s high common-mode rejection ratio ensures stability, even in noisy environments. You can also use the chip to filter out unwanted frequencies by adding capacitors to the circuit. This approach improves the accuracy of sensor readings. For example, in temperature monitoring systems, the LM2904DR can amplify the sensor’s output voltage for precise data acquisition.

Active Low-Pass Filter Implementation

Designing an active low-pass filter with the LM2904DR helps you eliminate high-frequency noise from your circuits. Connect the input signal to the non-inverting input pin and use resistors and capacitors to set the cutoff frequency. The chip’s wide voltage range ensures compatibility with various power supplies. Its dual-channel design allows you to create two filters on a single chip, saving space in your circuit. This application is particularly useful in audio systems, where clean signals are essential. By integrating the LM2904DR, you can achieve superior noise reduction and enhance overall circuit performance.

Tips for Selecting and Powering the LM2904DR

Choosing the Right Variant for Your Project

When choosing the right op amp for your project, consider the specific requirements of your circuit. The LM2904DR comes in several variants, each catering to different needs:

LM2904NG: Ideal for through-hole designs, featuring an 8-lead PDIP package.
LM2904DR: A compact SOIC-8 narrow body package, perfect for space-constrained designs.
LM2904DR2G: Similar to the LM2904DR but available in a 2500-reel packaging for high-volume production.

The LM2904DR variant stands out for its low power consumption, high gain-bandwidth product, and wide voltage range (3V to 32V). These features make it suitable for battery-powered devices and signal amplification tasks. Its compact design simplifies integration into modern electronics, especially where space is limited.

Power Supply Recommendations

The LM2904DR supports both single and dual power supply configurations. Choose the appropriate setup based on your application:

Supply Type	Voltage Range
Single	3 V to 32 V
Dual	±1.5 V to ±16 V

For most applications, a single supply configuration is sufficient. However, dual supplies are beneficial for circuits requiring symmetrical voltage ranges, such as audio processing. Ensure your power supply remains within the recommended voltage range to avoid damaging the chip.

Enhancing Performance with Best Practices

To maximize the LM2904DR's performance, follow these best practices:

Optimize your circuit design to minimize power usage. The chip’s low quiescent current (0.7mA) ensures efficient energy management, prolonging device lifespan.
Use its compact SOIC package to simplify installation in space-constrained designs. This reduces production costs and enhances design flexibility.
Maintain clean input signals by adding capacitors to filter noise. This improves stability and accuracy, especially in noise-sensitive applications.

By adhering to these guidelines, you can fully leverage the LM2904DR’s capabilities, ensuring reliable and efficient circuit performance.

The LM2904DR stands out as a reliable dual operational amplifier for your circuit designs. Its low power consumption, high gain-bandwidth product, and compact SOIC package make it ideal for diverse projects, including industrial automation and consumer electronics. You can rely on its precision and versatility for applications like signal amplification, filtering, and voltage comparison. To ensure authenticity and competitive pricing, purchase the LM2904DR from authorized distributors like deirchip.com. Explore its potential to enhance your designs and bring efficiency to your projects.

FAQ

What makes the LM2904DR suitable for battery-powered devices?

The LM2904DR consumes very little power, with a quiescent current of only 0.7mA. This efficiency helps extend battery life in portable devices. Its wide voltage range (3V to 32V) also ensures compatibility with various power sources, making it ideal for energy-sensitive applications.

Tip: Use the LM2904DR to optimize energy usage in your designs.

Can the LM2904DR handle noisy environments?

Yes, the LM2904DR performs well in noisy environments. Its high common-mode rejection ratio (CMRR) minimizes noise interference, ensuring stable and accurate signal processing. This feature makes it a reliable choice for applications like sensor signal conditioning and audio systems.

How do you set the gain for the LM2904DR?

You can set the gain by adding resistors in the feedback loop between the output and inverting input pins. The resistor values determine the amplification level. For example, increasing the feedback resistor increases the gain.

Note: Proper resistor selection ensures accurate signal amplification.

What package options are available for the LM2904DR?

The LM2904DR comes in a compact SOIC-8 package, perfect for space-constrained designs. Other variants include the LM2904NG (PDIP package) and LM2904DR2G (reel packaging for high-volume production). Choose the package that best fits your project’s requirements.

Can the LM2904DR be used for audio applications?

Absolutely! The LM2904DR’s high gain-bandwidth product ensures clear and distortion-free audio signal amplification. It works well in audio amplifiers, active filters, and noise reduction circuits. Its low power consumption also makes it suitable for portable audio devices.

Emoji Tip: 🎵 Use the LM2904DR for high-quality audio processing!