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I2S Audio Codec + 1.3W Class AB/D Mono Speaker Amplifier
General Description
The ALC5621 is a highly-integrated I2S/PCM interface audio codec with multiple input/output ports and is designed for mobile computing and communications. It provides a Stereo Hi-Fi DAC for playback and Stereo ADC for recording via the I2S/PCM interface.
To reduce component count, the device can connect directly to:
  • MONO or stereo differential analog inputs
  • LINE_IN stereo Single-Ended analog inputs
  • AUX_IN Single-Ended analog inputs
  • Stereo Headphone Output
  • Single-end stereo configurable to AUXOUT or BTL MONO_OUT
  • 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. Class AB or Class D amplifiers are easily swapped via simple register configuration, and the 1.3 Watt Mono speaker removes the need for an additional amplifier, further cutting both cost and required board area. Additionally, a flexible hardware 5-band equalizer with configurable gain, bandwidth, and center frequency, enriches the sound experience.

The ALC5621 AVDD operates at supply voltages from 2.3V to 3.6V. DVDD operates from 1.71 to 3.6V, and SPKVDD operates from 2.3 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 ALC5621 is available in a 5x5mm ‘Green’ QFN-32 package, making it ideal for use in handheld portable systems.
  • Digital-to-Analog Converter with 92dB SNR and –85dB THD+N
  • Analog-to-Digital Converter with 85dB SNR and –80dB THD+N
  • Two analog stereo single-ended inputs, LINE-IN_L/R and AUXIN_L/R
  • Stereo differential analog microphone inputs, with boost pre-amplifiers (+20/+30/+40dB)
  • BTL (Bridge-Tied Load) Speaker output with on-chip 1.3W speaker driver (SPKVDD=5V, 4.7Ω load with THD+N=40dB)
  • Mono Speaker output supports Class AB or Class D optional
  • Stereo headphone output with on-chip 45mW headphone driver (AVDD=3.3V, 16Ω load)
  • 25mW SE or 75mW BTL Single-Ended differential MONO_OUT configurable to AUXOUT (AVDD=3.3V, 32Ω load)
  • Audio jack insert detection and microphone switch detection
  • Power management and enhanced power saving
  • Supports digital 5-band equalizer (EQ)
  • Supports digital spatial sound and pseudo stereo effect
  • Supports pop noise suppression
  • Internal PLL can receive wide range of clock input
  • Digital power supplies from 1.71V to 3.6V; speaker amplifier power supplies from 2.3V to 5V
  • Analog power and headphone power supplied from 2.3V to 3.6V
  • Supports soft-mute function
  • 32-pin QFN package
  • Tablet PC system/Ultra-Mobile PC (UMPC)
  • Personal Digital Assistants (PDA) or PDA Phone
  • Multimedia Phone Applications
  • Portable Navigation Device (PND)
  • Bluetooth Headphone
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