LMC6032 CMOS Dual Operational Amplifier Technical Summary

Overview

The LMC6032 is a high-performance CMOS dual operational amplifier designed for precision applications requiring low power consumption and rail-to-rail input capability. This component is optimized for operation from either single or dual power supplies, making it versatile for a wide range of circuit configurations. With its exceptional input characteristics and robust performance, the LMC6032 is suitable for battery-powered devices, sensor interfaces, and other applications demanding precision analog signal processing.

Key advantages of the LMC6032 include its extremely low input bias current, wide input common-mode voltage range (including ground when operating from a single supply), and excellent power efficiency. The CMOS architecture provides high input impedance and minimal power consumption while maintaining good noise performance.

Features

• Dual operational amplifier in single package
• Single supply operation: 3V to 15V
• Dual supply operation: ±1.5V to ±7.5V
• Input common-mode range includes ground (V-)
• Extremely low input bias current: 40fA typical
• High voltage gain: 130dB typical
• Low power consumption: 200μA per amplifier typical
• Output voltage swing within 50mV of rails (typical)
• Unity-gain stable
• ESD protection: >2000V HBM
• Extended temperature range: -40°C to +85°C

Applications

The LMC6032's combination of features makes it ideal for numerous precision analog applications:

• Battery-powered instrumentation
• Sensor signal conditioning (thermocouples, RTDs, strain gauges)
• Medical instrumentation
• Portable test equipment
• Active filters
• Precision integrators
• Data acquisition systems
• Photodiode amplifiers
• Low-power audio preamplifiers
• Sample-and-hold circuits

Electrical Characteristics

All specifications are given for V+ = 5V, V- = 0V, TA = 25°C unless otherwise noted.

DC Characteristics

• Input Offset Voltage: 0.5mV typical, 3mV maximum
• Input Offset Voltage Drift: 1.5μV/°C typical
• Input Bias Current: 40fA typical, 200fA maximum
• Input Offset Current: 30fA typical, 150fA maximum
• Input Common-Mode Voltage Range: -0.3V to V+ -1V
• Common-Mode Rejection Ratio: 90dB typical
• Power Supply Rejection Ratio: 90dB typical
• Large Signal Voltage Gain: 130dB typical (RL = 100kΩ)

AC Characteristics

• Gain Bandwidth Product: 1.4MHz typical
• Slew Rate: 1.1V/μs typical
• Equivalent Input Noise Voltage: 35nV/√Hz at 1kHz
• Total Harmonic Distortion: 0.01% typical (1kHz, RL = 10kΩ)
• Phase Margin: 60° typical

Power Supply Characteristics

• Supply Voltage Range: 3V to 15V single supply, ±1.5V to ±7.5V dual supply
• Supply Current per Amplifier: 200μA typical, 300μA maximum
• Power Supply Rejection Ratio: 90dB typical

Package Information

The LMC6032 is available in several industry-standard packages:

8-Pin SOIC (Small Outline Integrated Circuit)

• Package Code: SOIC-8
• Dimensions: 4.9mm x 3.9mm body
• Lead Pitch: 1.27mm
• Moisture Sensitivity Level: 1 (Unlimited floor life)
• Recommended PCB Land Pattern: IPC-7351 compliant

8-Pin PDIP (Plastic Dual In-line Package)

• Package Code: PDIP-8
• Dimensions: 9.81mm x 6.35mm body
• Lead Pitch: 2.54mm
• Moisture Sensitivity Level: 1 (Unlimited floor life)

8-Pin TSSOP (Thin Shrink Small Outline Package)

• Package Code: TSSOP-8
• Dimensions: 3.0mm x 4.4mm body
• Lead Pitch: 0.65mm
• Moisture Sensitivity Level: 1 (Unlimited floor life)

Typical Performance Characteristics

The following performance characteristics are representative of device operation under specified conditions:

Input Characteristics

The LMC6032 exhibits exceptionally low input bias currents that remain stable across the entire common-mode voltage range. The input stage maintains high impedance (>10¹³Ω) even when the inputs approach the negative rail, making it ideal for high-impedance sensor interfaces.

Output Characteristics

The output stage can drive loads as low as 600Ω while maintaining rail-to-rail performance. The output voltage swing typically comes within 50mV of either supply rail when driving moderate loads (10kΩ). The amplifier remains stable with capacitive loads up to 100pF without additional compensation.

Power Supply Considerations

The LMC6032 demonstrates excellent power supply rejection across its entire operating range. Bypass capacitors of 0.1μF placed close to the power supply pins are recommended for optimal performance, particularly in noisy environments or when operating at higher gains.

Design Considerations

PCB Layout Guidelines

For optimal performance, follow these PCB layout recommendations:

• Use a solid ground plane for lowest noise operation
• Keep input traces short and away from output traces
• Place bypass capacitors as close as possible to the power pins
• Use guard rings around high-impedance inputs when dealing with very low current signals
• Minimize parasitic capacitance at the inputs for highest speed operation

Thermal Considerations

While the LMC6032 has low power consumption, thermal management should still be considered in high-temperature environments or when operating at maximum supply voltages. The SOIC and TSSOP packages have thermal resistance (θ_JA) of approximately 160°C/W and 240°C/W respectively.

Ordering Information

The LMC6032 is available in several package variants with different temperature ranges:

• LMC6032IM: SOIC-8, Industrial Temperature (-40°C to +85°C)
• LMC6032IP: PDIP-8, Industrial Temperature (-40°C to +85°C)
• LMC6032IMX: SOIC-8, Tape and Reel, Industrial Temperature
• LMC6032CM: SOIC-8, Commercial Temperature (0°C to +70°C)