Audio Speakers-on-a-Chip Speakers-on-a-Chip with On-Chip Voice/Audio DSP, Integrated I2S/I2C Codec, and PWM Class-D Amplifier CX20703 Conexant’s portfolio includes a comprehensive suite of semiconductor solutions for communications and consumer applications. The CX20703 is one of Conexant’s Speakers-on-a-Chip (SPoC) solutions with the proprietary on-chip Digital Signal Processor (DSP), Codec, Class-D/PWM (Pulse-Width Modulator) driver, and I2S and I2C interfaces in a cost-effective single-chip package. The solution features a suite of turnkey audio and voice enhancement algorithms designed for applications such as Mobile Internet Device, Multimedia IP Phone, Portable Navigation Device, Portable Media Player, and Intercom Systems. The CX20703 offers multiple digital data and control I/O for flexible peripheral or MCU/MPU connectivity. The device features one 4-wire and one 5-wire digital audio interface that can be mixed or multiplexed to support dual bi-directional I2S, Pulse Code Modulation (PCM), S/PDIF-out with independent sampling rates. The device can be controlled and configured by both read and write capability through I2C and Serial Peripheral Interface (SPI). The device integrates three high-performance 102 dB SNR, 24 bit DACs for stereo speaker output, capless headphone output, and single-ended/differential line-output. The analog input paths feature four high-performance 24-bit ADCs supporting mono or array-microphones, and Auxiliary stereo line-inputs. Different audio sampling rates ranging from 8 kHz to 96 kHz are generated directly from the master clock without the need for external PLL. The powerefficient, Class-D PWM output supports an external amplifier to drive large speakers and offers the option to drive maximum of 2.5 W from the integrated stereo amplifier. The CX20703 operates at supply voltages down to 3.3 V for analog and 1.8 V for the digital core. An advanced power management scheme can be configured to achieve <5 mW in stand-by mode or <1 mW in deep sleep mode. The on-chip DSP hardware runs a suite of innovative Conexant proprietary voice processing algorithms and audio post processing effects that dramatically improves sound quality and frees-up processing power for other applications without compromising on cost and future firmware scalability. Conexant’s acoustic echo cancellation, noise reduction, beam-forming, line echo cancellation, dynamic range compression, digital equalizer, and 3D effects deliver a clear, rich and full sound experience to the end user. The embedded SPoC Configuration Toolbox allows designers to quickly adjust and optimize audio performance on the target system. The CX20703 eliminates the need for a mulitiple chip reference design, making it easy and economical for maufacturers to design products for high quality audio and voice applications. Applications • • • • • Mobile Internet Device Multimedia IP phone Portable Navigation Device Portable Media Player Intercom Systems Distinguishing Features • 24-bit DAC/ADC, SNR 102 dB, THD - 92 dB at 48 kHz 3.3 V • Configurable on-chip proprietary DSP –Subband acoustic echo suppression and cancellation –Subband line echo cancellation –Array mic beam-forming –Noise reduction –Dynamic loudness adaptor –Mic auto gain control –Digital parametric equalizer (10 bands/ channel) –Dynamic range compression –3D Expander (Phantom mode and Immersion mode) • 4-wire and 5-wire digital audio I/O (I2S/PCM/ SPDIF), supporting full duplex independent sampling rates • One 3-wire I2C or 4-wire SPI slave interface for external MCU • 2.5 W x 2 BTL stereo Class-D speaker amplifier, also configurable as a PWM • Flexible power management • Audio sample rate: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48, 64, 88.2, 96 kHz Part Number CX20703 Description Speakers-on-a-Chip Voice/Audio DSP, Integrated I2S/I2C Codec, and PWM Class-D Amplifier Audio Speakers-on-a-Chip CX20703 Features CODEC • 4-wire and 5-wire digital audio I/O (I2S/PCM/SPDIF), supporting full duplex independent sampling rates • One 3-wire I2C or 4-wire SPI slave interface for external MCU • Eight GPIO pins • 2.5 W x 2 BTL stereo Class-D speaker amplifier, also configurable as a PWM • Output for external feedback-less type Class-D amplifier • Spread Spectrum for filter-less, low EMI output • Up to three single-ended line in (convertible to one stereo differential line in and one single-end) • Two microphones interfaces with on-chip bias supply • Integrated 50 mW headphone driver with jack sense • Differential line out • 24-bit DAC/ADC, SNR 102 dB, THD - 92 dB at 48 kHz 3.3 V • Audio sample rate: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48, 64, 88.2, 96 kHz • 90 dB dynamic range with 0.01percent THD+N at 4 Ω load • 10-bit ADC multiplexed to support analog volume potentiometer and DC level detection SE or Diff Line In M SE or Diff Line In M SE Line In M SE or Diff Line In 3 Capless HP Out 32 W DAC Capless HP Out 32 W Matrix 2 Matrix 1 SE or Diff 10 kW Line SE or Diff 10 kW Line MON ADC Volume Voltage Monitor EEPROM DATA UART EEPROM CLK MISO SCL TX_DAT RX_DAT WS MOS/SDA SPI I2C Slave PCM/I2S TX_DAT RX_DAT TX_WS/SDIF CLK PCM/I2S CLK Jack Sense 2W Class-D 4 W PWM Out Controller DMA TX Clock Circuitry Matrix 0 Bias Generator RX_WS Sense DAC 2W Class-D 4 W PWM Out RX ADC XTAL Out SE or Diff 600 W or 10 kW Line DSP GPO 4 MIC In DMA GPO 3 ADC GPO 0 MIC In XTAL In/ Master In DAC DMA CSN M Memory ADC GPO 1 SE Line In 3 GPO 2 M MIC Bus DSP ADC M SE or Diff Line In MIC Bus • Flexible power management • Variable master clock rates –7 mW stereo playback (1.8 V supply) –14 mW record and playback (1.8 V supply) DSP • Subband acoustic echo suppression and cancellation • Subband line echo cancellation • Array mic beam-forming • Noise reduction • Dynamic loudness adaptor • Mic auto gain control • Digital parametric equalizer (10 bands/channel) • Dynamic range compression • 3D Expander (Phantom mode and Immersion mode) Configuration Tool • Fast configuration tool via USB-to-I2C from PC • Device configuration and DSP parameter adjustment • Output log for convenient MCU programming CX20703 Interface Diagram The CX20703 is offered in a 76-pin QFN package and is compatible with Conexant’s CX20709 SPoC Conexant Product Portfolio Conexant’s comprehensive product portfolio includes solutions for imaging, audio, video, and embedded-modem applications. © 2009 Conexant Systems, Inc. All Rights Reserved. Conexant and the Conexant logo are registered trademarks of Conexant Systems, Inc. All other trademarks are owned by their respective owners. Although Conexant strives for accuracy in all its publications, this material may contain errors or omissions and is subject to change without notice. This material is provided AS IS and without any express or implied warranties, including merchantability, fitness for a particular purpose and non-infringement. Conexant shall not be liable for any special, indirect, incidental or consequential damages as a result of its use. 09-2884 www.conexant.com General Information: U.S. and Canada: (888) 855-4562 International: 1+ (949) 483-3000 Headquarters 4000 MacArthur Blvd. Newport Beach, CA 92660 Doc# PBR-202404