CX20709 USB/I2S Audio CODEC, Audio/Voice DSP, Stereo Class-D, Headphone Driver Overview The CX20709 is one of Conexant's Audio/ Voice DSP CODEC family solutions with highly integrated hardware DSP, CODEC, Class-D amplifier, USB, I2S, S/PDIF, and I2C interfaces. The solution features a suite of turnkey audio and voice enhancement algorithms designed for convergence audio entertainment and voice communication applications, such as PC Docking System/ Sound-Bar, Portable Multimedia/Navigation Devices, Smart Home Intercom System, Media IP Phone, and Unified Communication Peripherals. The CX20709 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, which can be mixed or multiplexed to support bi-directional I2S, PCM, and S/PDIF. The device can be controlled and configured by both read and write capability through I2C and SPI. The device features a USB 2.0 Compliant Audio Class interface (full-speed for data and control) and a UART interface for the external MCU/MPU interface. The device integrates three highperformance 102 dB SNR, 24-bit DACs for 2.1CH speaker output, capless headphone output, and single-ended/differential lineoutput. The analog input paths feature four high performance, 24-bit ADC supporting up to four microphones or three stereo LineInputs. 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 power-efficient integrated Class-D stereo amplifier operates at 5 V or 3.3 V with an optional maximum power of 2.8 W at a 4 Ω load. For intercom application, the mono line-out supports 600 Ω drivers, which can drive the isolation transformer directly without an external operational amplifier. The on-chip DSP is designed to run a suite of Voice Processing Algorithms and Audio Post Processing Effects offered by Conexant. The device features Conexant's soundbar algorithm for USB 5.1 channel sound-bar enhancement. The audio designer has the ability to adjust and optimize performance on the target system by using the SPoC Configuration Toolbox. The CX20709 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 <7.55 mW in sleep mode. Applications PC Speakers System LCD Display/SoundBar Home Automation/Intercom PND/PMP Multi Media IP Phone Telepresence/Unified Communication Device Embedded Applications Ordering Number Part Number Package Description DSAC-L709-21CH CX20709-21Z 76QFN DSAC-L709-12CH CX20709-12Z 76QFN CX20709-EVK2 CX20709-EVK2 CX20709-21Z Evaluation Kit CX20709-EVK2-IN CX20709-EVK2-IN CX20709-21Z Intercom Daughter Board Not recommended for new design All devices are lead-free (Pb Free) and RoHS compliant Part Number CX20709 Description USB/I2S Audio CODEC, Audio/Voice DSP, Stereo Class-D, Headphone Driver CODEC Features LINE_IN_1L_LP (SE or Diff Line In) M Σ ADC Σ ADC M MIC_IN2_L/LINE_IN_3L LINE_IN_1R_RP (SE or Diff Line In) M LINE_IN_2R_RN (SE or Diff Line In) M DMIC_IN DAC KS2 DMA Volume VOLT_MON NVDAT NVCLK UART_TX UART UART_RX I2C_SPI_CSN USB_DP MON ADC SPI I2C Slave USB I2S_PCM_2_TX_DAT PASS_THRU I2S_PCM_2_CLK/DMIC_CLK I2S_PCM_2_RX_DAT/DMIC_IN/SPDIF_IN PASS_THRU I2S_PCM_2_WS PCM/I2S I2S_PCM_1_TX_DAT I2S_PCM_1_TX_WS/SPDIF_OUT I2S_PCM_1_CLK I2S_PCM_1_RX_WS PCM/I2S MCLK I2S_PCM_1_RX_DAT Jack Sense CLASSD_RP CLASSD_RN (2.5W Class-D 4 Ω Out) LINE_OUT_LP LINE_OUT_LN (SE or Diff, LINE_OUT_LN 10 kΩ line) LINE_OUT_RP LINE_OUT_RN (SE or Diff, LINE_OUT_LN 10 kΩ line) Controller Bias Generator Clock Circuitry KS1 R KS0 ADC SENSE_A HP_OUT_L (Capless HP Out 32 Ω) HP_OUT_R (Capless HP Out 32 Ω) CLASSD_LP CLASSD_LN (2.5W Class-D 4 Ω Out) GPO4 MIC_IN_R GPO 0 ADC XTLO DAC DSP X2 MIC_IN_L XTLI DMA Memory DMA L DMIC_CLK MICBIAS_L MONO_OUT_P (SE or Diff, 600 Ω or 10 kΩ line) MONO_OUT_N (SE or Diff, 600 Ω or 10 kΩ line) DAC M MIC_IN2_R/LINE_IN_3R MICBIAS_R Dual Microphone Beam Forming Noise Reduction Dynamic Loudness Adaptor Microphone Automatic Gain Control – Subband Line Echo Cancellation (2-way intercom applications) – Digital Equalizer (10 bands/ channel) – Dynamic Range Compression – 4th Order Digital Crossover for Subwoofer Line-out – Conexant sound-bar algorithm for USB 5.1 channel sound-bar enhancement (available in CX20709-21Z) SPoC Configuration Toolbox – Fast configuration via USB-to-I2C from PC – Data path, I/O setup, and DSP parameter adjustment – Output log for convenient MCU programming M LINE_IN_2L_LN (SE or Diff Line In) I2C_EN/MCLK GPO3 SPI_MISO GPO2 I2C_SPI_SCL I2C_SDA/SPI_MOSI GPO 1 USB_DM 4-wire and 5-wire digital audio I/O (I2S/ PCM/SPDIF), supporting full duplex independent sampling rates, master clock for optional PCM/I2S slave codec (SPDIF-in available in CX20709-21Z) One 2-wire I2C and one 4-wire SPI slave interface for external MCU USB 2.0 Compliant full speed UAC Interface Supporting dual USB playback end points (available in CX20709-21Z) Stereo Digital Microphone, up to 12 MHz clock rate (available in CX20709-21Z) Eight GPIO pins 2.8 W x 2 BTL filter-less stereo ClassD Speaker Amplifier – Low EMI Class-D amplifier output with Spread Spectrum and common mode scrambler Integrated 50 mW headphone driver with jack sense Single-ended or differential line output USB_5VDET – – – – Separate mixed mono line-output for sub-woofer or intercom usage Three single-ended stereo or one differential stereo analog audio input Up to 4 microphone interfaces with onchip bias supply (available in CX20709-21Z) 24-bit DAC/ADC, SNR 102 dB, THD 92 dB at 48 kHz 3.3 V – In DSP mode, the processing will be limited the input and output to 16-bit effective resolution Audio sample rate: 8,16, 22.05, 24, 32, 44.1, 48, 88.2, 96 kHz 90 dB Dynamic Range with 0.1% THD+N at 4 Ω load 12-bit ADC multiplexed to support analog volume potentiometer and DC level detection Flexible Power Management Variable master clock rates Configurable On-Chip proprietary Voice/Audio Processing – Subband Acoustic Echo Cancellation Functional Block Diagram Conexant Product Portfolio Conexant’s comprehensive product portfolio includes solutions for imaging, audio, video surveillance, and embedded modem applications. © 2012 Conexant Systems, Inc. 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