I2S/PCM Audio DAC with Headphone and Mono Class-D Speaker Amplifier

General Description

The ALC5628 is a highly-integrated I2S/PCM interface audio DAC with multiple input/output ports and is designed for Multimedia and Communication handheld devices. It provides a Stereo Hi-Fi DAC for playback via the I2S/PCM interface and is controlled by the I2C interface. 

To reduce component count, the device can connect to:

  • LINE_IN stereo Single-Ended analog inputs (can be configured to mono Differential analog input)
  • Single-Ended stereo Headphone
  • MONO or Stereo Bridge-Tied Load (BTL) Speaker

Multiple analog input and output pins are provided for seamless integration with analog connected wireless communication devices. Differential input/output connections efficiently reduce noise interference, providing better sound quality. The Class-D amplifier can be directly connected to a 2.4 Watt Mono Speaker, removing the need for an additional amplifier, further cutting both cost and required board area. 

The ALC5628 AVDD operates at supply voltages from 2.3V to 3.6V. DCVDD and DBVDD operate from 1.8V to 3.6V, and SPKVDD operates from 2.3V to 5V. To extend battery life, each section of the device can be powered down individually under software control. Leakage current in maximum power saving state is less than 10µA. 

The ALC5628 is available in a 4x4mm ‘Green’ QFN-24 package, making it ideal for use in handheld portable systems.


  • Digital-to-Analog Converter with 100dB SNR and –86dB THD+N at 3.3V
  • Two analog stereo single-ended or one stereo differential input, LINEIN_L/R
  • BTL (Bridge-Tied Load) Class-D Speaker output with on-chip 2.4W speaker driver (SPKVDD=5V, 4W load)
  • Supports playback soft-mute, digital volume, digital AVC
  • Stereo headphone output with on-chip 45mW headphone driver (AVDD=3.3V, 16W load)
  • Supports pop noise suppression with external capacitor
  • Digital power supplied from 1.8V to 3.6V
  • Analog power and headphone power supplied from 2.3V to 3.6V
  • Power management and enhanced power saving
  • Internal PLL can receive wide range of clock inputs
  • Supports crystal oscillator
  • Supports sampling rate 8KHz ~ 192KHz
  • Supports I2C control interface
  • Supports three programmable data interfaces
    • I2S, left justified or DSP
    • 16/20/24-bit word lengths
    • Master or Slave clock mode
  • Speaker amplifier power supplies from 2.3V to 5V
  • 24-pin QFN 4x4mm package for small footprint


  • Portable media player
  • MP3 player
  • Bluetooth A2DP (Advanced Audio Distribution Profile) headsets
  • Portable Navigation Device (PND)