LM2902N - Quad Operational Amplifier

Overview

The LM2902N is a quad operational amplifier that belongs to the LM124 series. It consists of four independent, high-gain, internally frequency compensated op-amps designed specifically for single power supply operation across a wide voltage range. The device also supports split power supply configurations while maintaining low power consumption that remains independent of the supply voltage magnitude.

This component is particularly suitable for applications requiring multiple operational amplifiers in a single package, offering space savings and improved system reliability. The LM2902N is characterized by its robust performance across industrial temperature ranges, making it ideal for harsh environments.

Key Features

• Quad Operational Amplifiers: Four independent op-amps in a single package
• Wide Power Supply Range: 3V to 32V single supply or ±1.5V to ±16V dual supply
• Low Supply Current Drain: Typically 0.8mA per amplifier (independent of supply voltage)
• Internally Frequency Compensated: Stable for unity gain applications
• Large DC Voltage Gain: 100dB typical
• Wide Bandwidth: 1MHz typical
• Low Input Bias Current: 20nA typical
• Low Input Offset Voltage: 2mV typical
• Common-Mode Input Voltage Range: Includes ground
• Differential Input Voltage Range: Equal to the power supply voltage
• Industrial Temperature Range: -40°C to +125°C

Applications

The LM2902N's versatile characteristics make it suitable for a wide range of applications across various industries:

• Transducer Amplifiers: Ideal for sensor signal conditioning
• DC Gain Blocks: Suitable for precision amplification stages
• Active Filters: Can be used in various filter configurations
• Industrial Control Systems: Robust enough for factory automation
• Power Supply Control Circuits: Voltage regulation and monitoring
• Signal Conditioning: For analog signal processing
• Portable Instruments: Low power consumption extends battery life
• Automotive Systems: Can withstand harsh automotive environments
• Consumer Electronics: Audio processing and other analog functions

Electrical Characteristics

All specifications are typical at 25°C with VCC = 5V unless otherwise noted.

Input Characteristics

• Input Offset Voltage: 2mV (max 7mV)
• Input Offset Current: 3nA (max 30nA)
• Input Bias Current: 20nA (max 150nA)
• Input Common-Mode Voltage Range: 0V to VCC-1.5V
• Input Differential Voltage Range: VCC
• Common-Mode Rejection Ratio: 70dB (min 65dB)

Output Characteristics

• Output Voltage Swing: 0V to VCC-1.5V (RL = 10kΩ)
• Output Short-Circuit Current: 20mA (continuous to ground)
• Large-Signal Voltage Gain: 100V/mV (min 25V/mV, RL = 10kΩ)

Dynamic Characteristics

• Gain Bandwidth Product: 1MHz (typical)
• Slew Rate: 0.5V/µs (typical)
• Input Noise Voltage: 35nV/√Hz (typical at 1kHz)

Power Supply Characteristics

• Supply Voltage Range: 3V to 32V (single supply) or ±1.5V to ±16V (dual supply)
• Supply Current (per amplifier): 0.8mA (typical)
• Power Supply Rejection Ratio: 65dB (typical)

Package Information

The LM2902N is available in multiple package options to suit different application requirements:

14-Pin PDIP (Plastic Dual In-line Package)

• Package Code: N
• Dimensions: 19.3mm x 6.35mm x 4.57mm
• Pin Spacing: 2.54mm (0.1 inch)
• Operating Temperature Range: -40°C to +125°C
• Moisture Sensitivity Level (MSL): 1 (Unlimited floor life at ≤30°C/85%RH)

14-Pin SOIC (Small Outline Integrated Circuit)

• Package Code: D
• Dimensions: 8.65mm x 3.9mm x 1.5mm
• Pin Spacing: 1.27mm (0.05 inch)
• Operating Temperature Range: -40°C to +125°C
• Moisture Sensitivity Level (MSL): 1 (Unlimited floor life at ≤30°C/85%RH)

Design Considerations

When implementing the LM2902N in circuit designs, consider the following:

• Power Supply Decoupling: Use 0.1µF ceramic capacitors close to the power pins for optimal performance
• PCB Layout: Keep input traces short and away from output traces to prevent oscillation
• Heavy Capacitive Loads: May require isolation resistors when driving >100pF loads
• Input Protection: The device includes built-in ESD protection, but additional protection may be needed in harsh environments
• Thermal Considerations: In high-temperature applications, ensure adequate PCB copper for heat dissipation

Comparison with Similar Devices

The LM2902N offers several advantages compared to similar quad op-amp devices:

• Wider Supply Voltage Range: 3V-32V vs. typical 5V-18V for many competitors
• Lower Power Consumption: 0.8mA per amplifier vs. 1mA or more for similar devices
• Industrial Temperature Range: -40°C to +125°C vs. commercial-grade alternatives
• Single-Supply Operation: Can operate down to ground while many competitors require dual supplies

Reliability and Qualification

The LM2902N is designed for high reliability in demanding applications:

• ESD Protection: Human Body Model: 2000V
• Manufacturing Standards: Produced in ISO 9001 certified facilities
• Automotive Qualification: Available in