OP470 High-Performance Quad Operational Amplifier

Overview

The OP470 is a high-performance monolithic quad operational amplifier designed to deliver exceptional signal integrity and precision in demanding applications. It features extremely low voltage noise (5 nV/√Hz at 1 kHz max), making it comparable to industry-leading amplifiers from Analog Devices. The OP470 is ideal for applications requiring high gain, low noise, and excellent common-mode rejection. Its quad configuration allows for compact designs while maintaining high performance across all four amplifiers.

Features

• Very Low Noise: 5 nV/√Hz at 1 kHz (max), ensuring high-fidelity signal amplification in sensitive circuits.
• Excellent Input Offset Voltage: 0.4 mV (max), minimizing errors in precision DC applications.
• Low Offset Voltage Drift: 2 µV/°C (max), providing stable performance over temperature variations.
• Very High Gain: 1000 V/mV (min), enabling accurate amplification of very small signals.
• Outstanding Common-Mode Rejection (CMR): 110 dB (min), reducing interference from common-mode signals.
• Slew Rate: 2 V/µs (typical), ensuring fast response to input signal changes.
• Gain-Bandwidth Product: 6 MHz (typical), suitable for a wide range of frequency applications.
• Industry-Standard Quad Pinout: Ensures compatibility with existing designs and easy integration.
• Available in Die Form: Provides flexibility for custom packaging and integration in specialized applications.

Applications

The OP470 is designed for precision applications where low noise, high gain, and stability are critical. Key application areas include:

• Medical Instrumentation: ECG amplifiers, patient monitoring systems, and precision sensors.
• Audio Equipment: High-fidelity preamplifiers, mixers, and professional audio processing.
• Test and Measurement: Data acquisition systems, strain gauge amplifiers, and precision voltage references.
• Industrial Control: Process control systems, servo amplifiers, and instrumentation amplifiers.
• Communications: Low-noise RF amplifiers, signal conditioning circuits, and filtering applications.

Electrical Characteristics

The following table summarizes the key electrical specifications of the OP470:

Absolute Maximum Ratings

• Supply Voltage: ±18 V
• Input Voltage Range: ±VS
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Key Performance Specifications

• Input Offset Voltage: 0.4 mV (max)
• Input Bias Current: 10 nA (max)
• Input Offset Current: 2 nA (max)
• Common-Mode Rejection Ratio (CMRR): 110 dB (min)
• Power Supply Rejection Ratio (PSRR): 100 dB (min)
• Large-Signal Voltage Gain: 1000 V/mV (min) at RL = 2 kΩ
• Slew Rate: 2 V/µs (typical)
• Gain-Bandwidth Product: 6 MHz (typical)
• Noise Performance: 5 nV/√Hz at 1 kHz (max)

Package Information

The OP470 is available in multiple package options to suit various application requirements. The standard package options include:

• 14-Lead PDIP (Plastic Dual In-Line Package): Industry-standard through-hole package for easy prototyping and testing.
• 14-Lead SOIC (Small Outline Integrated Circuit): Surface-mount package for compact PCB designs.
• Die Form: Bare die for custom packaging and integration in specialized or high-reliability applications.

Package Dimensions

• PDIP: 19.3 mm x 6.35 mm (body dimensions)
• SOIC: 8.65 mm x 3.9 mm (body dimensions)

Thermal Characteristics

• Thermal Resistance (θJA): 100°C/W (PDIP), 160°C/W (SOIC)
• Maximum Junction Temperature: 150°C

Design Considerations

When designing with the OP470, consider the following guidelines to ensure optimal performance:

• Power Supply Decoupling: Use 0.1 µF ceramic capacitors close to the supply pins to minimize noise and ensure stability.
• PCB Layout: Keep input traces short and away from high-frequency signals to reduce noise coupling.
• Thermal Management: Ensure adequate heat dissipation, especially in high-gain or high-frequency applications, to prevent thermal drift.
• Input Protection: Avoid exceeding the absolute maximum input voltage range to prevent damage to the input stage.

Conclusion

The OP470 is a versatile, high-performance quad operational amplifier that excels in low-noise, high-precision applications. Its combination of low noise, high gain, and excellent common-mode rejection makes it suitable for a wide range of industrial, medical, and audio applications. With multiple package options, including die form, the OP470 offers flexibility for both standard and custom designs. By following recommended design practices, engineers can leverage the OP470's capabilities to achieve superior performance in their circuits.