Cirrus公司的CS470xx系列是新一代音频系统级芯片(ASOC)32位处理器,每秒的乘法运算(MAC/S)为300,000,000,目标应用在高保真对成本敏感的设计.该系列集成了S/PDIF Rx, S/ PDIF Tx,模拟输入,模拟输出和取样速率转换器(SRC),能简化系统设计和降低系统总成本.主要应用在汽车音响,DTV,MP3坞站,AVR和DVD Rx, DSP控制的扬声器(条形音箱,低音扩音箱).本文介绍了CS470xx系列主要特性, CS47048方框图, CDB47xxxD主板和子板方框图以及详细电路图.

The CS470xx family is a new generation of audio system-on-a-chip (ASOC) processors targeted at high fidelity, cost sensitive designs. The CS470xx simplifies system design and reduces total system cost by integrating the S/PDIF Rx, S/ PDIF Tx, analog inputs, analog outputs, and sample rate converters (SRCs). For example, a hardware SRC can
down-sample a 192 kHz S/PDIF stream to a lower Fs to reduce memory and MIPS requirements for processing. This integration effectively reduces the chip count from 3 to 1, which allows smaller, less expensive board designs.

The CS470xx is programmed using the simple yet powerful Cirrus proprietary DSP Composer™ GUI development and pre-production tuning tool. Processing chains can be designed using a drag-and-drop interface to utilize functional macro audio DSP primitives and custom audio filtering blocks. The end result is a software image that is downloaded to the DSP via the serial control port.

The Cirrus Framework™ programming environment offers Assembly and C language compilers and other software development tools for porting existing code to the CS470xx family platform.

The CS470xx is available in a 100-pin LQFP package with exposed pad for better thermal characteristics. Both Commercial (0℃ to +70℃) and Automotive (–40℃ to +85℃) temperature grades are available.

CS470xx系列主要特性:

 Cost-effective, High-performance 32-bit DSP

 300,000,000 MAC/S (multiply accumulates per second)

 Dual MAC cycles per clock

 72-bit accumulators are the highest precision in the industry

 32K x 32-bit SRAM with three 2K blocks assignable to either Y data or program memory

 Integrated DAC and ADC Functionality

 8 Channels of DAC output: 108dB DR, –98 dB THD+N

 4 Channels of ADC input: 105dB DR, –98 dB THD+N

 Integrated 5:1 analog mux feeds one stereo ADC

 Configurable Serial Audio Inputs and Outputs

 Integrated 192 kHz S/PDIF Rx

 Integrated 192 kHz S/PDIF Tx

 Supports 32-bit serial data @ 192 kHz

 Supports 32-bit audio sample I/O between DSP chips

 TDM I/O modes

 Supports Different Sample Rates (Fs)

 Three integrated hardware SRC blocks

 Output can be master or slave

 Supports dual-domain Fs on S/PDIF vs. I²S inputs

 DSP Tool Set with Private Keys Protect Customer IP

 Integrated Clock Manager/PLL

 Flexibility to operate from internal PLL, external crystal, external oscillator

 Input Fs Auto Detection with μC Acknowledgement

 Host Control and Boot via I²C™ or SPI™ Serial Interface

 Configurable GPIOs and External Interrupt Input

 1.8V Core and a 3.3V I/O that is tolerant to 5V input

 Low-power Mode

CS470xx系列目标应用:

 Automotive head units and outboard amplifiers

 Automotive processors and automotive integration hubs

 Digital TV

 MP3 docking stations

 AVR and DVD Rx

 DSP controlled speakers (subwoofers, sound bars)

图1.CS47048方框图

图2.CDB47xxxD-DCxx开发板外形图

图3.CDB47xxxD主板方框图

图4.CDB47xxx-DC48子板方框图

图5.CDB47xxD差分板方框图

图6.CDB47xxD(差分)子板连接器

图7.CDB47xxD(差分)数字音频控制连接器

图8.CDB47xxD(差分)数字串行闪存

图9.CDB47xxD(差分)麦克风前置放大器

图10.CDB47xxD(差分)电源连接器

图11.CDB47xxD(差分)ADC滤波器

图12.CDB47xxD(差分)电压输出电路

图13.CDB47xxD(差分)MCU卡接口

图14.CDB47xxD(差分)MCU卡电路

图15.CDB47xxD(差分)MCU卡用户接口

图16. CDB47xxx-DC48子板框图

图17. CDB47xxx-DC48子板电路图
详情请见:
http://www.cirrus.com/en/pubs/proDatasheet/CS470xx_F1.pdf
和
http://www.cirrus.com/en/pubs/manual/CDB470xx_UM_DB6.pdf