LM1458N Dual Operational Amplifier

Overview

The LM1458N is a general-purpose dual operational amplifier that integrates two high-performance op-amps in a single package. Designed for versatility and ease of use, this component is part of the LM1458/LM1558 family, which is widely used in analog circuit applications. The two amplifiers share a common bias network and power supply leads, simplifying circuit design while maintaining independent operational functionality. The LM1458N is known for its stability, reliability, and broad compatibility with a variety of circuit configurations.

Features

• Dual Operational Amplifiers: Contains two independent op-amps in a single package, reducing board space and component count.
• No Frequency Compensation Required: Internally compensated for stable operation without external components.
• Wide Supply Voltage Range: Operates from ±5V to ±15V, making it suitable for a variety of power supply configurations.
• High Gain Bandwidth Product: Ensures reliable performance in amplification and signal processing applications.
• Low Input Offset Voltage: Minimizes errors in precision applications.
• Low Power Consumption: Ideal for battery-powered and energy-efficient designs.
• Short-Circuit Protection: Built-in safeguards against output short circuits, enhancing durability.
• Wide Temperature Range: Operates reliably across industrial temperature ranges.

Applications

The LM1458N is suitable for a broad range of analog signal processing tasks, including but not limited to:

• Active Filters: Low-pass, high-pass, band-pass, and notch filter designs.
• Signal Conditioning: Amplification, buffering, and impedance matching for sensor interfaces.
• Oscillators and Waveform Generators: Sine, square, and triangle wave generation.
• Voltage Comparators: Level detection and switching applications.
• Analog Computing: Summing amplifiers, integrators, and differentiators.
• Audio Processing: Preamplifiers, tone control circuits, and mixing consoles.
• Industrial Control Systems: Feedback loops, PID controllers, and instrumentation amplifiers.

Electrical Characteristics

The following table summarizes the key electrical specifications of the LM1458N under typical operating conditions (V_CC = ±15V, T_A = 25°C unless otherwise specified).

DC Characteristics

• Input Offset Voltage: 2 mV (max)
• Input Bias Current: 500 nA (max)
• Input Offset Current: 200 nA (max)
• Common Mode Rejection Ratio (CMRR): 70 dB (min)
• Supply Voltage Rejection Ratio (SVRR): 70 dB (min)
• Large-Signal Voltage Gain: 25 V/mV (min)
• Output Voltage Swing: ±12 V (min) with R_L = 2 kΩ

AC Characteristics

• Gain Bandwidth Product: 1 MHz (typ)
• Slew Rate: 0.5 V/µs (typ)
• Input Noise Voltage: 40 nV/√Hz (typ) at 1 kHz
• Input Noise Current: 0.5 pA/√Hz (typ) at 1 kHz

Power Supply Characteristics

• Supply Voltage Range: ±5V to ±15V
• Quiescent Current (per amplifier): 1.5 mA (typ)
• Power Consumption: 50 mW (typ) at ±15V

Package Information

The LM1458N is available in a standard 8-pin dual in-line package (DIP), which is widely used in through-hole PCB designs. The package dimensions and pin configuration are as follows:

Pin Configuration

• Pin 1: Output A
• Pin 2: Inverting Input A
• Pin 3: Non-Inverting Input A
• Pin 4: V_EE (Negative Supply)
• Pin 5: Non-Inverting Input B
• Pin 6: Inverting Input B
• Pin 7: Output B
• Pin 8: V_CC (Positive Supply)

Mechanical Specifications

• Package Type: 8-Pin PDIP (Plastic Dual In-Line Package)
• Dimensions: 9.81 mm x 6.35 mm (0.386 in x 0.250 in)
• Lead Pitch: 2.54 mm (0.100 in)
• Operating Temperature Range: 0°C to +70°C (Commercial Grade)
• Storage Temperature Range: -65°C to +150°C

Conclusion

The LM1458N is a versatile and reliable dual operational amplifier that offers a balance of performance, ease of use, and cost-effectiveness. Its no-compensation-required design simplifies circuit implementation, while its robust electrical characteristics make it suitable for a wide range of analog applications. Whether used in audio processing, industrial control, or signal conditioning, the LM1458N provides engineers with a dependable solution for their amplification needs.