LM1458 Dual Operational Amplifier

Overview

The LM1458 and LM1558 are general-purpose dual operational amplifiers designed for a wide range of analog applications. These amplifiers share a common bias network and power supply leads, making them efficient and compact for dual-channel designs. The LM1458 is widely used in industrial, consumer, and automotive applications due to its robust performance and ease of use.

These operational amplifiers do not require external frequency compensation, simplifying circuit design and reducing component count. They are built on a monolithic integrated circuit structure, ensuring reliable operation and consistent performance across temperature variations.

Features

• Dual Operational Amplifier: Two independent op-amps in a single package, reducing board space and cost.
• No Frequency Compensation Required: Internally compensated for stable operation without external components.
• Wide Supply Voltage Range: Operates from ±5V to ±15V, suitable for various power supply configurations.
• High Gain Bandwidth Product: Ensures good frequency response for general-purpose applications.
• Low Input Offset Voltage: Minimizes errors in precision DC applications.
• Low Power Consumption: Ideal for battery-operated and portable devices.
• Short-Circuit Protection: Built-in safeguards against output short circuits.
• Wide Temperature Range: Operates reliably from -55°C to +125°C (LM1558 military-grade version).

Applications

The LM1458 is versatile and finds use in numerous analog circuit designs, including:

• Signal Conditioning: Amplification, filtering, and buffering of analog signals.
• Active Filters: Low-pass, high-pass, band-pass, and notch filter implementations.
• Voltage Followers: Impedance matching and signal isolation.
• Comparators: Simple threshold detection circuits.
• Oscillators: Sine, square, and triangle wave generation.
• Instrumentation Amplifiers: Precision measurement circuits.
• Audio Processing: Preamplifiers, tone control, and mixing circuits.
• Power Supply Control: Voltage regulation and monitoring.

Electrical Characteristics

The following specifications are typical for the LM1458 under standard operating conditions (V_CC = ±15V, T_A = 25°C unless otherwise noted).

DC Characteristics

• Input Offset Voltage: 2 mV (max)
• Input Offset Current: 20 nA (max)
• Input Bias Current: 500 nA (max)
• Input Voltage Range: ±12V (min)
• Large-Signal Voltage Gain: 50 V/mV (min, R_L = 2 kΩ)
• Supply Current (per amplifier): 1.4 mA (typ)

AC Characteristics

• Gain Bandwidth Product: 1 MHz (typ)
• Slew Rate: 0.5 V/µs (typ)
• Common-Mode Rejection Ratio (CMRR): 70 dB (typ)
• Power Supply Rejection Ratio (PSRR): 80 dB (typ)

Operating Conditions

• Supply Voltage Range: ±5V to ±15V
• Operating Temperature Range: 0°C to +70°C (LM1458), -55°C to +125°C (LM1558)
• Output Short-Circuit Duration: Continuous (protected)

Package Information

The LM1458 is available in multiple package options to suit different assembly and thermal requirements.

Standard Package Options

• 8-Pin PDIP (Plastic Dual In-Line Package):
  • Package Code: N
  • Dimensions: 9.81 mm x 6.35 mm
  • Pin Pitch: 2.54 mm
• 8-Pin SOIC (Small Outline Integrated Circuit):
  • Package Code: D
  • Dimensions: 4.90 mm x 3.91 mm
  • Pin Pitch: 1.27 mm
• 8-Pin TO-99 (Metal Can):
  • Package Code: H
  • Dimensions: 9.08 mm diameter
  • Pin Configuration: Radial leads

Pin Configuration

The pinout for the LM1458 (8-pin PDIP/SOIC) is as follows:

• 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)

Conclusion

The LM1458 dual operational amplifier is a reliable and versatile component for a broad spectrum of analog applications. Its no-compensation-required design, robust electrical characteristics, and flexible packaging options make it a preferred choice for engineers designing cost-effective and space-efficient circuits. Whether used in audio, instrumentation, or control systems, the LM1458 delivers consistent performance under varying operational conditions.