Headphone Amplifier for Voltage-Output Audio DACs Reference Design
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Key Document


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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Schematic/Block Diagram

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Test Data

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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA1688  36V, 10MHz, Low Distortion High Drive Rail-to-Rail Output Audio Operational Amplifiers  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA1688 Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 917 09 Oct 2015
Design files (3)
Title Type Size (KB) Date
PDF 110 02 Nov 2015
PDF 103 02 Nov 2015
ZIP 703 02 Nov 2015

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