LM2904 IC:Overview,Pinout & Its Applications

The series amplifier, such as the LM2904 IC, primarily includes independent and high-gain op-amps. These amplifiers are characterized by a very low input offset voltage. They operate with a single power supply over a wide range of voltages but can also function with split power supplies. These ICs feature low power supply current and are available in two packages: SO-8 and SO-14. In the SO-8 package, dual devices are available, whereas, in the SO-14 package, quad devices are available. This article provides an overview of the LM2904 IC.

 

What is LM2904 IC?

 

The LM2904 IC is a high-gain amplifier that includes two independent and internally frequency-compensated op-amps. It operates with a single power supply over a wide voltage range. Alternative ICs for this amplifier include MCP602, LM358, NE5532, RC4558, OPA2134, OPA2228, and OPA2604.

 

LM2904 IC Pin Configuration

 

The pin diagram of the LM2904 IC is shown below. Each pin of this amplifier and its functionality are discussed below.

• Pin 1 (OUTPUT A): This pin is the output of op-amp A.
• Pin 2 (INPUT A-): This pin is the inverting input of op-amp A.
• Pin 3 (INPUT A+): This pin is the non-inverting input of op-amp A.
• Pin 4 (GND): This pin is the negative supply voltage pin or ground pin.
• Pin 5 (INPUT B+): This pin is the non-inverting input of op-amp B.
• Pin 6 (INPUT B-): This pin is the inverting input of op-amp B.
• Pin 7 (OUTPUT B): This pin is the output of op-amp B.
• Pin 8 (VCC): This pin is the positive voltage supply.

 

Features of  LM2904 IC

 

The main features of the LM2904 IC include the following:

 

• Voltage supplies: Wide range
• Input biasing current: Low
• Frequency compensation: Internal
• Input offset voltage and offset current: Low
• Differential input voltage range: Equivalent to the voltage power supply
• Common-mode voltage input range: Includes ground
• Output protection: Short circuit protection
• Compensation: Internal
• Common-mode range: Extends to negative supply
• Supply operation: Single and split
• Packages: Lead-free available
• Specifications

 

The main specifications of the LM2904 IC include the following:

 

• DC voltage gain: 100 dB
• Voltage supply range: 3 volts to 26 volts
• Power supply rejection ratio (PSRR): 50 dB
• Operating current supply: 250 µA
• Input offset voltage (Vos): 7 mV
• Output current per channel: 30 mA
• Bandwidth (BW): 1 MHz
• Input bias current (Ib): 250 nA
• Common Mode Rejection Ratio (CMRR): 70 dB

 

Where to Use?

 

The LM2904 IC is commonly used as a dual package version of the IC LM741, sharing similar electrical characteristics. This IC is free from latch-up issues, making it ideal for voltage follower applications.

 

Additionally, it includes short circuit protection and internal frequency compensation, requiring minimal external components for various applications. Due to these features, LM2904 ICs are frequently used in guitar amplifiers and DVD players.

 

These ICs consume very low current, making them an excellent choice for applications demanding such characteristics.

 

LM2904 IC Circuit

 

The schematic diagram of the LM2904 IC is shown below. This circuit is built with two separate and high-gain op-amps, which include internal frequency compensation. These ICs are primarily used in control systems within industries and automotive systems. The circuit operates with a single power supply over a wide range of voltages.

Applications of LM2904 IC

 

The applications of the LM2904 IC primarily include systems where implementation with a single power supply is easier. For example, these amplifier circuits can be powered directly from the typical voltage used in logic systems, such as 5V.

 

These ICs provide the necessary electronic interfaces without requiring any additional power supply. In linear mode, the range of input common-mode voltage mainly includes the ground terminal, and the output voltage can also reach the ground when operating with a single power supply.

 

Packages & Dimensions of LM2904 IC 

 

The packages and dimensions of the LM2904 IC are as follows:

 

• SOIC (8): 4.9 x 3.91 mm
• PDIP (8): 9.81 x 6.35 mm
• DSBGAs (8): 1.31 x 1.31 mm

 

These packages have different dimensions to differentiate them easily.

 

 Applications

 

The applications of the LM2904 IC include the following:

 

- Comparators

- Transducer Amplifiers

- LED Driver

- Conventional Operational Amplifier Circuits

- Fixed Current Source

- Integrator

- Power Amplifier

- Differentiator

- High Compliance Current Sink

- Adder

- Difference Amplifier

- Input Bias Current

- Voltage Follower

- Canceling the Error Caused by Input Bias Current

- Digital Multimeters

- Oscilloscopes

- Walkie-Talkie

- Battery Management Solution

- Summing Amplifiers

- Multivibrators

- Oscillators

- DC Gain Block

 

Thus, this is an overview of the LM2904 IC, covering its pin configuration, features, specifications, packages, dimensions, and applications. From the above LM2904 IC datasheet, we can conclude that these ICs are used in embedded systems, precision power supplies, industrial control, active filters, DC gain blocks, general signal amplification, conditioning, and transducer amplifiers. Here is a question for you: What are the ratings of the LM2904 IC?

 

LM2904 Manufacturer

 

ON Semiconductor is a semiconductor supplier company that was formerly a Fortune 500 company and ranked 512 in the Fortune 1000 in 2020. The company's product portfolio includes power and signal management, logic, discrete, and custom devices for automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace, and power applications. ON Semiconductor operates a network of manufacturing facilities, sales offices, and design centers across North America, Europe, and the Asia Pacific. The company is headquartered in Phoenix, Arizona, with revenues of US$3.907 billion in 2016, making it one of the top 20 semiconductor sales leaders in the world.

 

Frequently Asked Questions

 

What is the operating voltage range of LM2904?

 

The operating voltage range of LM2904 is:

 

Single power supply: 3V to 30V DC

Dual power supply: ±1.5V to ±15V DC

What is LM2904 generally used for?

 

LM2904 is a low-power dual operational amplifier. It is generally used in operational amplifier circuits and can be employed in single-supply operational amplifier circuits.

 

What can be used instead of LM2904?

 

LM2904, a low-power dual operational amplifier, can be replaced by many chips, such as LM158, LM258, LM358, LM17358, and others.

 

Is the integrated circuit LMT2904 the same as LM2904?

 

Both are dual op-amps with essentially the same indicators. The prefixes in the models differ due to different manufacturers.

 

Can LM358 and LM2904 be used as voltage followers?

 

Yes, but the accuracy is not very high.