TL084 JFET-Input Operational Amplifier

Overview

The TL084 is part of the TL08_ family of JFET-input operational amplifiers, designed to provide a versatile and high-performance solution for a wide range of analog applications. This monolithic integrated circuit combines well-matched, high-voltage JFET and bipolar transistors to deliver superior electrical characteristics. The TL084 is particularly noted for its high slew rates, low input bias and offset currents, and minimal offset voltage temperature coefficient. It is available in multiple temperature ranges, making it suitable for commercial, industrial, and military applications.

Features

• JFET-Input Technology: Ensures high input impedance and low input bias currents.
• High Slew Rate: Enables fast signal response, making it ideal for high-frequency applications.
• Low Input Bias and Offset Currents: Reduces errors in precision circuits.
• Low Offset Voltage Temperature Coefficient: Enhances stability over varying temperatures.
• Wide Supply Voltage Range: Operates efficiently across a broad range of supply voltages.
• Offset Adjustment Capability: Allows for fine-tuning to minimize DC errors.
• External Compensation Options: Provides flexibility in optimizing performance for specific applications.
• Multiple Temperature Grades: Available in commercial (0°C to 70°C), industrial (–40°C to 85°C), and military (–55°C to 125°C) ranges.

Applications

The TL084 is widely used in various analog and mixed-signal circuits due to its robust performance and versatility. Key applications include:

• Audio Amplifiers: Its high slew rate and low noise make it suitable for audio signal processing.
• Active Filters: The JFET-input stage ensures minimal signal distortion in filter designs.
• Instrumentation Amplifiers: Low input bias currents and offset voltages enhance measurement accuracy.
• Data Acquisition Systems: Provides reliable signal conditioning for sensors and transducers.
• Voltage Followers: High input impedance and low output impedance make it ideal for buffering applications.
• Oscillators and Waveform Generators: Stable performance across temperature variations ensures consistent operation.
• Medical Equipment: Used in precision circuits where low noise and high accuracy are critical.

Electrical Characteristics

The following table summarizes the key electrical specifications of the TL084 operational amplifier under typical operating conditions (unless otherwise noted):

DC Characteristics

• Input Offset Voltage: 3 mV (max)
• Input Bias Current: 30 pA (typ)
• Input Offset Current: 5 pA (typ)
• Input Resistance: 10^12 Ω (typ)
• Large-Signal Voltage Gain: 200 V/mV (min)
• Supply Voltage Range: ±5 V to ±18 V

AC Characteristics

• Slew Rate: 13 V/µs (typ)
• Gain Bandwidth Product: 3 MHz (typ)
• Common-Mode Rejection Ratio (CMRR): 80 dB (typ)
• Power Supply Rejection Ratio (PSRR): 100 dB (typ)

Temperature Characteristics

• Input Offset Voltage Drift: 18 µV/°C (typ)
• Operating Temperature Range:
  • Commercial (C suffix): 0°C to 70°C
  • Industrial (I suffix): –40°C to 85°C
  • Military (M suffix): –55°C to 125°C

Package Information

The TL084 is available in multiple package configurations to accommodate different application requirements. Below are the common package options:

14-Pin Packages

• PDIP (Plastic Dual In-Line Package):
  • Package Code: N
  • Dimensions: 19.30 mm x 6.35 mm
  • Pin Pitch: 2.54 mm
• SOIC (Small Outline Integrated Circuit):
  • Package Code: D
  • Dimensions: 8.65 mm x 3.90 mm
  • Pin Pitch: 1.27 mm

16-Pin Packages

• TSSOP (Thin Shrink Small Outline Package):
  • Package Code: PW
  • Dimensions: 5.00 mm x 4.40 mm
  • Pin Pitch: 0.65 mm

Thermal Characteristics

• Junction-to-Ambient Thermal Resistance (θ_JA):
  • PDIP: 67°C/W
  • SOIC: 172°C/W
  • TSSOP: 200°C/W
• Maximum Junction Temperature (T_J): 150°C

Conclusion

The TL084 JFET-input operational amplifier is a highly versatile and reliable component, offering exceptional performance for a wide range of analog applications. Its combination of high slew rate, low input bias currents, and robust temperature stability makes it a preferred choice for designers in industries ranging from consumer electronics to military systems. With multiple package options and temperature grades, the TL084 provides flexibility and reliability for diverse operational environments.