ON Semiconductor - LC823450

LC823450 is an ultra-low power, 32-bit, 192 kHz high-resolution audio-capable signal processing system-on-chip (SoC). It consists of dual ARM Cortex-M3, 32-bit DSP (LPDSP32) core, hard wired MP3 encoder/decoder, and integrated SRAM.

It is also equipped with analog peripheral functionality, such as PLLs, class-D stereo HP amplifier, 6-band equalizer and ADCs/DACs. Our proprietary LPDSP32 supports Noise/Echo cancellation, and playback speed control capability for MP3, WMA, AAC and PCM with VBR. With fine-tuned power management and dedicated hard wired audio blocks, LC823450 provides a significantly longer battery life without compromising audio quality, for voice recorders and wearable audio applications.

Target applications

  • Sound Recorders
  • Wearable Audio Players
  • Bluetooth Headsets
  • Smart Phone Accessories


  • ARM® Cortex®-M3 Dual Core
  • I2S I/F with 16/24/32-bit, MAX 192 kHz (2-ch x 2) audio functions with 16/24/32-bit, MAX 192 kHz
  • Various original DSP codes for audio processing: MP3 codec, FLAC codec, Noise Cancel, Variable speed playback, etc.
  • Internal SRAM (1656K byte) for ARM® Cortex®-M3 Dual Core and original DSP
  • Hard wired audio functions:
    • MP3 encoder and decoder
    • EQ (6-band equalizer)
    • ASRC (Asynchronous Sample Rate Converter)
  • Integrated analog functions:
    • low-power Class D HP amplifier
    • System PLL
    • dedicated audio PLL, ADC
  • Various interfaces:
    • USB2.0 HS device / host (not OTG)
    • eMMC
    • SD card
    • SPI, I2C
  • Oscillation controller to dynamically switch clock frequency
  • ARM® Cortex®-M3 Dual Core and original DSP clock max frequency:
    • 160 MHz @1.2 V
    • 100 MHz @1.0 V
  • 32-bit fixed point, dual-MAC original DSP optimized for audio processing
  • Cortex®-M3 Single Core power consumption: 0.11 mW/MHz @1.0 V


  • Dual Core and DSP enables parallel processing.
  • High-Resolution Audio processing capability with 32-bit 192 kHz
  • Possible to reduce DSP codes development cost.
    Several DSP codes are available with no additional fee such as Noise cancel, Variable speed playback, etc.
  • Large scale program can be implemented by large capacity memory.
  • Low power audio processing by hard wired audio functions
    (Reference: 4 mA @128K bps, 44.1 kHz MP3 hardware playback)
  • PCB space and cost is reduced by Integrated analog functions.
  • Various functions (SBC/AAC codec with the DSP, UART, ASRC) contribute to Bluetooth®audio.
  • Switching clock frequency by oscillation controller reduces unnecessary power consumption.
  • High processing capability with higher clock frequency.


Block diagram

ON Semiconductor LC823450 Low Power & High-Resolution Audio Processing System-on-Chip (SoC)


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