SDAA313A March   2026  – May 2026 INA1650-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Automotive Hi-Fi Headphone Audio System Overview
    1. 2.1 Key Technical Specifications of Automotive Hi-Fi Audio Systems
    2. 2.2 Design Requirements for Automotive Hi-Fi Headphone Audio Systems
  6. 3Automotive Hi-Fi Headphone Audio System Working Principle and Circuit Design
    1. 3.1 DAC Circuit Design
    2. 3.2 Differential-to-Single-Ended Circuit Design
  7. 4Simulation
    1. 4.1 Transient Response Simulation
    2. 4.2 Noise Analysis
    3. 4.3 Power Consumption Simulation and Thermal Calculation
  8. 5Experimental Test
  9. 6Summary
  10. 7References
  11. 8Revision History

Abstract

This application note presents a headphone amplifier design based on the INA1650-Q1, specifically engineered for automotive audio systems. The solution meets the practical requirements of on-board headphone functionality and is suitable for scenarios including passenger-exclusive audio and noise-free in-vehicle audio experiences. To effectively drive low-sensitivity headphones and ensure sufficient volume, the amplifier must deliver ample output power over a wide range of headphone load impedances. A key design challenge stems from conflicting power output requirements: driving high-impedance headphones calls for a higher amplifier output voltage (and thus a higher supply voltage), while delivering the same power to low-impedance headphones requires a significantly higher output current. By paralleling the two channels of a single INA1650-Q1 to boost output power, this challenge is effectively resolved, enabling stable and high-performance audio amplification that complies with the stringent specifications of automotive audio systems.