OP11 Quad Operational Amplifier

Overview

The OP11 is a monolithic quad operational amplifier that integrates four matched 741-type op-amps in a single 14-lead DIP package. Designed for precision analog applications, the OP11 offers excellent matching characteristics, low noise, and robust performance in a compact form factor. Its pin compatibility with the LM148/LM348 makes it an ideal drop-in replacement for legacy designs while providing enhanced performance metrics.

This device is particularly suited for applications requiring multiple op-amps with closely matched parameters, such as instrumentation amplifiers, active filters, and signal conditioning circuits. The OP11 features internal frequency compensation, continuous short-circuit protection, and low crossover distortion, ensuring reliable operation in demanding environments.

Features

• Four Matched 741-Type Op-Amps: Integrated into a single 14-lead DIP package for space efficiency.
• Guaranteed Offset Voltage (V_OS): 500 µV maximum, ensuring precision performance.
• Matched Common-Mode Rejection Ratio (CMRR): 94 dB minimum for superior noise immunity.
• Matched Offset Voltage (V_OS): 750 µV maximum across all four amplifiers.
• LM148/LM348 Direct Replacement: Pin-compatible with industry-standard quad op-amps.
• Low Noise Silicon-Nitride Passivation: Enhances long-term reliability and reduces noise.
• Internal Frequency Compensation: Eliminates the need for external components.
• Low Crossover Distortion: Ideal for audio and precision signal processing.
• Continuous Short-Circuit Protection: Safeguards the device against output faults.
• Low Input Bias Current: Minimizes errors in high-impedance circuits.

Applications

The OP11 is versatile and well-suited for a wide range of analog signal processing applications, including:

• Instrumentation Amplifiers: Leverages matched op-amps for high-accuracy differential amplification.
• Active Filters: Suitable for low-pass, high-pass, and band-pass filter designs.
• Signal Conditioning: Ideal for amplifying and filtering sensor outputs in industrial systems.
• Audio Processing: Low crossover distortion makes it suitable for audio mixers and preamps.
• Voltage Followers: Provides high input impedance and low output impedance for buffering applications.
• Analog Computing: Used in summing amplifiers, integrators, and other computational circuits.

Electrical Characteristics

The following table summarizes the key electrical specifications of the OP11 under typical operating conditions (V_CC = ±15V, T_A = 25°C unless otherwise noted):

DC Characteristics

• Input Offset Voltage (V_OS): 500 µV (max)
• Input Bias Current (I_B): 30 nA (typ)
• Input Offset Current (I_OS): 5 nA (typ)
• Common-Mode Rejection Ratio (CMRR): 94 dB (min)
• Power Supply Rejection Ratio (PSRR): 90 dB (typ)
• Large-Signal Voltage Gain (A_VOL): 200 V/mV (min)

AC Characteristics

• Gain Bandwidth Product (GBW): 1 MHz (typ)
• Slew Rate (SR): 0.5 V/µs (typ)
• Total Harmonic Distortion (THD): 0.01% (typ) at 1 kHz

Power Supply Characteristics

• Supply Voltage Range (V_CC): ±5V to ±18V
• Quiescent Current (I_Q): 1.7 mA per amplifier (typ)

Package Information

The OP11 is available in a standard 14-lead Dual Inline Package (DIP), which is widely used in through-hole PCB designs. The package dimensions and pinout are as follows:

14-Lead DIP Package Dimensions

• Package Type: PDIP-14
• Length: 19.3 mm (max)
• Width: 6.35 mm (max)
• Height: 4.57 mm (max)
• Lead Pitch: 2.54 mm

Pin Configuration

• Pin 1: Output A
• Pin 2: Inverting Input A
• Pin 3: Non-Inverting Input A
• Pin 4: V_CC- (Negative Supply)
• Pin 5: Non-Inverting Input B
• Pin 6: Inverting Input B
• Pin 7: Output B
• Pin 8: Output C
• Pin 9: Inverting Input C
• Pin 10: Non-Inverting Input C
• Pin 11: V_CC+ (Positive Supply)
• Pin 12: Non-Inverting Input D
• Pin 13: Inverting Input D
• Pin 14: Output D

Conclusion

The OP11 quad operational amplifier is a high-performance, cost-effective solution for applications requiring multiple matched op-amps. Its combination of low noise, precision matching, and robust protection features makes it an excellent choice for both industrial and consumer electronics. With its pin compatibility with the LM148/LM348, the OP11 simplifies upgrades and replacements in existing designs while delivering superior performance.