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 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 (C40℃ 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, C98 dB THD+N 4 Channels of ADC input: 105dB DR, C98 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) |