LM2904N - Dual Operational Amplifier

Overview

The LM2904N is part of the LM158 series of dual operational amplifiers, which consists of two independent, high-gain, internally frequency-compensated operational amplifiers. These amplifiers are specifically designed to operate from a single power supply over a wide range of voltages, making them highly versatile for various applications. The device can also operate from split power supplies, and its low power supply current drain remains independent of the supply voltage magnitude. The LM2904N is known for its robust performance, low power consumption, and wide operating voltage range, making it suitable for both industrial and consumer applications.

Features

• Dual Operational Amplifiers: Contains two independent op-amps in a single package.
• Wide Supply Voltage Range: Operates from a single power supply ranging from 3V to 32V, or dual supplies of ±1.5V to ±16V.
• Low Power Consumption: Low supply current drain (typically 0.7mA per amplifier) independent of supply voltage.
• Internally Frequency Compensated: No external compensation required for stable operation.
• Large DC Voltage Gain: Typically 100dB, ensuring high precision in amplification tasks.
• Wide Bandwidth: Unity gain bandwidth of 1MHz, suitable for a variety of signal processing applications.
• Low Input Bias Current: Typically 20nA, minimizing errors in high-impedance circuits.
• Available in Multiple Packages: Includes 8-pin DIP, SOIC, and other surface-mount options for flexibility in design.

Applications

The LM2904N is widely used in various electronic circuits due to its versatility and reliable performance. Common applications include:

• Signal Conditioning: Used in filtering, amplification, and buffering of analog signals.
• Sensor Interfaces: Ideal for amplifying signals from sensors such as temperature, pressure, and light sensors.
• Power Supply Control: Employed in voltage regulation and monitoring circuits.
• Audio Processing: Suitable for pre-amplification and tone control circuits in audio systems.
• Industrial Control Systems: Used in process control, instrumentation, and automation systems.
• Consumer Electronics: Found in devices like televisions, radios, and portable gadgets.
• Battery-Powered Devices: Due to its low power consumption, it is ideal for portable and battery-operated equipment.

Electrical Characteristics

The following table summarizes the key electrical characteristics of the LM2904N under typical operating conditions (V_CC = +5V, T_A = 25°C unless otherwise specified):

DC Characteristics

• Input Offset Voltage: 2mV (max)
• Input Bias Current: 20nA (typ)
• Input Offset Current: 2nA (typ)
• Large-Signal Voltage Gain: 100dB (typ)
• Supply Voltage Rejection Ratio (PSRR): 100dB (typ)

AC Characteristics

• Unity Gain Bandwidth: 1MHz (typ)
• Slew Rate: 0.3V/µs (typ)
• Common-Mode Rejection Ratio (CMRR): 85dB (typ)

Power Supply Characteristics

• Supply Voltage Range: 3V to 32V (single supply), ±1.5V to ±16V (dual supply)
• Supply Current (per amplifier): 0.7mA (typ)

Package Information

The LM2904N is available in several package options to accommodate different design requirements. Below are the details of the most common packages:

8-Pin DIP (Dual In-Line Package)

• Package Code: N
• Dimensions: 9.81mm x 6.35mm x 3.3mm
• Pin Count: 8
• Operating Temperature Range: -40°C to +125°C

8-Pin SOIC (Small Outline Integrated Circuit)

• Package Code: D
• Dimensions: 4.9mm x 3.9mm x 1.25mm
• Pin Count: 8
• Operating Temperature Range: -40°C to +125°C

8-Bump micro SMD (Chip-Sized Package)

• Package Code: See AN-1112 for details
• Dimensions: Ultra-compact, suitable for space-constrained applications
• Pin Count: 8
• Operating Temperature Range: -40°C to +125°C

Conclusion

The LM2904N is a highly reliable and versatile dual operational amplifier that offers excellent performance across a wide range of applications. Its low power consumption, wide supply voltage range, and robust design make it a preferred choice for engineers working on industrial, consumer, and battery-powered electronic systems. With multiple package options available, the LM2904N provides flexibility for various design constraints, ensuring seamless integration into diverse circuit designs.