LT1078

LT1078/LT1079 - Precision Operational Amplifiers

Overview

The LT1078 and LT1079 are precision operational amplifiers designed for applications requiring high accuracy and low noise. These devices offer excellent DC performance, including low input offset voltage, low drift, and high open-loop gain. The LT1078 is a dual op-amp, while the LT1079 is a quad op-amp, providing flexibility for various circuit designs. These amplifiers are suitable for industrial, medical, and instrumentation applications where precision signal conditioning is critical.

Features

• Low Input Offset Voltage: 30µV (LT1078), 35µV (LT1079) typical
• Low Drift: 0.4µV/month long-term stability
• Wide Supply Range: ±22V maximum
• High CMRR and PSRR: Excellent noise rejection
• Multiple Package Options: Available in PDIP, SOIC, and metal can packages
• Extended Temperature Range: -55°C to 125°C (M-grade)
• Indefinite Output Short-Circuit Duration: Robust protection

Applications

• Precision instrumentation amplifiers
• Medical equipment signal conditioning
• Strain gauge and bridge amplifiers
• High-accuracy data acquisition systems
• Low-noise preamplifiers
• Active filters and precision integrators
• Voltage references and regulators

Electrical Characteristics

All specifications at VS = ±5V, VCM = 0.1V, VO = 1.4V, TA = 25°C unless otherwise noted.

Package Information

The LT1078/LT1079 are available in multiple package options to suit different application requirements:

• J8 Package: 8-lead PDIP (Plastic Dual In-line Package)
  • Thermal resistance (θJA): 100°C/W
  • Maximum junction temperature: 150°C
• S8 Package: 8-lead SOIC (Small Outline IC)
  • Thermal resistance (θJA): 150°C/W
  • Maximum junction temperature: 150°C
• H Package: 8-lead TO-5 Metal Can
  • Thermal resistance (θJC): 45°C/W
  • Maximum junction temperature: 150°C
• N8 Package: 8-lead PDIP (Alternate pinout)
  • Thermal resistance (θJA): 130°C/W
  • Maximum junction temperature: 100°C

Absolute Maximum Ratings

• Supply Voltage: ±22V
• Differential Input Voltage: ±30V
• Input Voltage Range: Equal to positive supply voltage to 5V below negative supply
• Operating Temperature Range:
  • M-grade: -55°C to 125°C
  • I-grade: -40°C to 85°C
  • C-grade: 0°C to 70°C
• Lead Temperature (Soldering, 10 sec): 300°C
• Storage Temperature Range: -65°C to 150°C

Pin Configuration

The LT1078 (dual) and LT1079 (quad) have different pin configurations:

LT1078 (Dual) - S8 Package (SOIC):

• Pin 1: -IN A
• Pin 2: OUT A
• Pin 3: V+
• Pin 4: OUT B
• Pin 5: +IN A
• Pin 6: V-
• Pin 7: +IN B
• Pin 8: -IN B

LT1079 (Quad) - SW Package (Wide SOIC):

• Pin 1: OUT A
• Pin 2: -IN A
• Pin 3: +IN A
• Pin 4: V+
• Pin 5: +IN B
• Pin 6: -IN B
• Pin 7: OUT B
• Pin 9: OUT D
• Pin 10: -IN D
• Pin 11: +IN D
• Pin 12: V-
• Pin 13: +IN C
• Pin 14: -IN C
• Pin 15: OUT C

Design Considerations

When designing with the LT1078/LT1079, consider the following:

• For best DC performance, keep the amplifier within its common-mode input range
• Use proper bypassing (0.1µF ceramic close to supply pins) for optimal AC performance
• For high-impedance applications, consider guarding techniques to minimize leakage currents
• The metal can package (H) offers the best thermal performance for high-temperature applications
• The SOIC package (S8) is recommended for space-constrained applications

Ordering Information

The following part numbers are available:

• LT1078ACN8 - Commercial grade, PDIP package
• LT1078CN8 - Commercial grade, PDIP package
• LT1078IN8 - Industrial grade, PDIP package
• LT1078S8 - Commercial grade, SOIC package
• LT1078IS8 - Industrial grade, SOIC package
• LT1078MJ