LMC662 CMOS Dual Operational Amplifier

Overview

The LMC662 is a high-performance, CMOS dual operational amplifier designed for single-supply operation. It is optimized for applications requiring low power consumption, high input impedance, and rail-to-rail output swing. The device operates over a wide supply voltage range of +5V to +15V, making it suitable for battery-powered and portable electronics. Its precision performance and low noise characteristics make it ideal for signal conditioning, filtering, and sensor interfacing applications.

Features

• Rail-to-Rail Output Swing: Ensures maximum dynamic range in single-supply applications.
• Wide Supply Voltage Range: Operates from +5V to +15V, compatible with standard logic supplies.
• Low Power Consumption: Ideal for battery-operated and portable devices.
• High Input Impedance: Minimizes loading effects on signal sources.
• Low Input Bias Current: Suitable for high-impedance sensor interfaces.
• CMOS Technology: Provides excellent noise performance and low distortion.
• Dual Op-Amp Configuration: Two independent amplifiers in a single package for space-saving designs.
• Stable with Capacitive Loads: Reduces the need for external compensation.

Applications

The LMC662 is versatile and can be used in a wide range of applications, including:

• Portable and Battery-Powered Devices: Due to its low power consumption and single-supply operation.
• Signal Conditioning: Amplification and filtering of sensor signals in industrial and medical equipment.
• Active Filters: Low-pass, high-pass, and band-pass filter designs.
• Data Acquisition Systems: Interface for analog-to-digital converters (ADCs) and digital-to-analog converters (DACs).
• Audio Processing: Preamplifiers and tone control circuits.
• Voltage Followers: Buffering high-impedance sources.

Electrical Characteristics

The following table summarizes the key electrical specifications of the LMC662 under typical operating conditions (V_CC = +5V, T_A = 25°C unless otherwise noted).

DC Characteristics

• Supply Voltage Range: +5V to +15V
• Input Offset Voltage: 3mV (max)
• Input Bias Current: 0.1pA (typ)
• Input Offset Current: 0.05pA (typ)
• Common Mode Rejection Ratio (CMRR): 80dB (typ)
• Power Supply Rejection Ratio (PSRR): 90dB (typ)

AC Characteristics

• Gain Bandwidth Product (GBW): 1.4MHz (typ)
• Slew Rate: 1.3V/µs (typ)
• Total Harmonic Distortion (THD): 0.01% (typ at 1kHz)
• Input Voltage Noise: 25nV/√Hz (typ at 1kHz)

Power Characteristics

• Quiescent Current (per amplifier): 1.1mA (typ)
• Operating Temperature Range: -40°C to +85°C

Package Information

The LMC662 is available in multiple industry-standard packages, providing flexibility for different PCB layouts and assembly processes.

Available Packages

• 8-Pin SOIC (Small Outline Integrated Circuit): Compact footprint for space-constrained applications.
• 8-Pin PDIP (Plastic Dual In-Line Package): Suitable for prototyping and breadboarding.
• 8-Pin TSSOP (Thin Shrink Small Outline Package): Ultra-thin profile for high-density designs.

Pin Configuration

The pinout for the LMC662 (8-pin package) is as follows:

• Pin 1 (OUT A): Output of Amplifier A
• Pin 2 (IN- A): Inverting Input of Amplifier A
• Pin 3 (IN+ A): Non-Inverting Input of Amplifier A
• Pin 4 (V-): Negative Power Supply (Ground for Single-Supply Operation)
• Pin 5 (IN+ B): Non-Inverting Input of Amplifier B
• Pin 6 (IN- B): Inverting Input of Amplifier B
• Pin 7 (OUT B): Output of Amplifier B
• Pin 8 (V+): Positive Power Supply

Conclusion

The LMC662 CMOS dual operational amplifier is a versatile and high-performance component suitable for a wide range of analog signal processing applications. Its rail-to-rail output swing, low power consumption, and high input impedance make it an excellent choice for battery-powered devices, sensor interfaces, and precision signal conditioning. With its robust electrical characteristics and flexible packaging options, the LMC662 is a reliable solution for engineers designing modern electronic systems.