SNOS674G November   1997  – April 2020 LMC6482

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
    1.     Device Images
      1.      Rail-to-Rail Input
      2.      Rail-to-Rail Output
  4. Revision History
  5. Pin Configuration and Functions
    1.     Pin Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics for V+ = 5 V
    6. 6.6 Electrical Characteristics for V+ = 3 V
    7. 6.7 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Amplifier Topology
      2. 7.3.2 Input Common-Mode Voltage Range
      3. 7.3.3 Rail-to-Rail Output
    4. 7.4 Device Functional Modes
  8. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Upgrading Applications
      2. 8.1.2 Data Acquisition Systems
      3. 8.1.3 Instrumentation Circuits
      4. 8.1.4 Spice Macromodel
    2. 8.2 Typical Applications
      1. 8.2.1 3-V Single-Supply Buffer Circuit
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Capacitive Load Compensation
          2. 8.2.1.2.2 Capacitive Load Tolerance
          3. 8.2.1.2.3 Compensating For Input Capacitance
          4. 8.2.1.2.4 Offset Voltage Adjustment
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Typical Single-Supply Applications
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Instrumentation Circuits

The LMC6482 has the high input impedance, large common-mode range and high CMRR needed for designing instrumentation circuits. Instrumentation circuits designed with the LMC6482 can reject a larger range of common-mode signals than most in-amps. This makes instrumentation circuits designed with the LMC6482 an excellent choice of noisy or industrial environments. Other applications that benefit from these features include analytic medical instruments, magnetic field detectors, gas detectors, and silicon-based transducers.

A small valued potentiometer is used in series with Rg to set the differential gain of the 3-op-amp instrumentation circuit in Figure 57. This combination is used instead of one large valued potentiometer to increase gain trim accuracy and reduce error due to vibration.

LMC6482 01171329.pngFigure 57. Low-Power, Three-Op-Amp Instrumentation Amplifier

A two-op-amp instrumentation amplifier designed for a gain of 100 is shown in Figure 58. Low sensitivity trimming is made for offset voltage, CMRR, and gain. Low cost and low power consumption are the main advantages of this two-op-amp circuit.

Higher frequency and larger common-mode range applications are best facilitated by a three-op-amp instrumentation amplifier.

LMC6482 01171330.pngFigure 58. Low-Power, Two-Op-Amp Instrumentation Amplifier