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.
 

Features

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

Application

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

Benefits

• 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