SBOS901C March   2019  – September 2022 OPA1655 , OPA1656

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information: OPA1655
    5. 6.5 Thermal Information: OPA1656
    6. 6.6 Electrical Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Phase Reversal Protection
      2. 7.3.2 Electrical Overstress
      3. 7.3.3 EMI Rejection Ratio (EMIRR)
        1. 7.3.3.1 EMIRR IN+ Test Configuration
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Basic Noise Calculations
    2. 8.2 Typical Applications
      1. 8.2.1 Preamplifier Circuit for Vinyl Record Playback With Moving-Magnet Phono Cartridges
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Composite Headphone Amplifier
        1. 8.2.2.1 Application Curves
      3. 8.2.3 Baxandall Tone Control
        1. 8.2.3.1 Application Curves
      4. 8.2.4 Guitar Input to XLR Output
        1. 8.2.4.1 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Power Dissipation
      2. 8.4.2 Layout Example
  9. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 PSpice® for TI
        2. 9.1.1.2 TINA-TI™ Simulation Software (Free Download)
        3. 9.1.1.3 DIP-Adapter-EVM
        4. 9.1.1.4 DIYAMP-EVM
        5. 9.1.1.5 TI Reference Designs
        6. 9.1.1.6 Filter Design Tool
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.4 Guitar Input to XLR Output

The OPA165x are an excellent choice for guitar input circuits as a result of the high input impedance and ultra-low noise performance. Figure 8-11 gives an example of a basic guitar input circuit to differential XLR schematic. The logarithmic taper potentiometer shown in this circuit provides 6 dB of gain at 0%, and 40 dB of gain at 100%. The rail-to-rail output swing of the OPA165x allows for a high amplitude swing at the outputs of the differentially configured amplifiers, while maintaining very low distortion performance. A 10-µF dc blocking capacitor is used in the feedback of the noninverting stage to remove any dc offset as a result of the amplifier offset voltage. However, this dc blocking capacitor can be eliminated for applications that are not sensitive to low dc offsets.

Figure 8-11 Guitar Input to XLR Output Schematic