Headphone Amplifier for Voltage-Output Audio DACs Reference Design


Design files


This reference design details a high-fidelity headphone amplifier circuit suitable for portable applications, such as smartphones and tablets. It uses an operational amplifier (op amp) with low power consumption and a very small package to convert a differential output voltage to a single-ended signal suitable for headphones. The design achieves -110.2dB THD+N at >50mW of output power into 32Ω headphones.

  • Low power consumption (1.6mA/Ch) to maximize battery life
  • Extremely small solution size for space-constrained designs
  • >50mW output power (32Ω), suitable for a range of headphones
  • -106.7dB THD+N (1kHz, 10mW, 32Ω) for exceptional audio quality
  • 31mΩ output impedance
  • Stable into most headphones without series resistance
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

Audio op amps

OPA168836V, 10MHz, Low Distortion High Drive Rail-to-Rail Output Audio Operational Amplifiers

Data sheet: PDF | HTML

Technical documentation

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* Design guide Headphone Amplifier for Voltage-Output Audio DACs Design Guide Oct. 09, 2015

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