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Cirrus公司的CS470xx系列是高性能后处理以及混淆模拟和数字音频的音频系统级芯片(ASOC).具有高性价比的32位DSP, 300,000,000 MAC/S(每秒乘发运算),业界精度最高的72位居累加器,双路时钟域支持DAI和SPDIF RX一起输入,集成的取样速率转换器(SRC)允许音频流以差别简直取样速率混淆.集成的8路24位DAC的动态范围(DR)为108dB,THD+N为-98dB,4路24位ADC的DR为105dB,THD+N为-98dB,主要用于汽车音频放大器,汽车处理器,DTV,MP3坞站,AVR和DVD RX, DSP控制的扬声器.本京电港论坛文章先容了CS470xx 系列主要特点,方框架图,CDB47xxxS主板方框架图,电路原理图纸与主要元件, CDB47xxx-DC48子板方框架图,电路原理图纸与主要元件. The CS470xx DSP is designed to provide high-performance post-processing and mixing of analog and digital audio. Dual clock domains are supported when the DAI and SPDIF RX inputs are used together. Integrated sample rate converters (SRCs) allow audio streams with different sample rates to be mixed. The low-power standby preserves battery life for applications that are always on, but not necessarily processing audio, such as automotive audio systems. The CS470xx family is a new generation of audio system-on-a-chip (ASOC) processors targeted at high fidelity, cost sensitive designs. Derived from the highly successful CS48500 32-bit fixed-point audio enhancement processor family, the CS470xx further simplifies system design and reduces total system cost by integrating the S/PDIF Rx, S/PDIF Tx, analog inputs, analog outputs, and 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. CS470xx 系列典范应用: 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) 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 place/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 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°C to +70°C) and Automotive (C40℃ to +85℃) temperature grades. CS470xx 系列主要特点: 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 24-bit DAC output: 108dB DR, C98 dB THD+N 4† Channels of 24-bit 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 w/ 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 图6{京电港论坛} CDB47xxxS (单端)主板对应的元件: 1. +9V Power In 2. Optical S/PDIF Out 3. Coax S/PDIF Out 4. Optical S/PDIF In 5. Coax S/PDIF In 6. +5V Header 7. Line-Level Analog Outputs 8. CDB47xxS-DC48 Daughtercard Connectors 9. Mic Input 10. Single-Ended Line-Level Inputs 11. MCU Rotary Encoder 12. MCU Buttons 13. SPI Flash 14. I2C EEPROM 15. LCD 16. DSP DAO Header 17. IR Receiver 18. Board Reset 19. MCU Programming Header 20. MCU Control Bypass Header 21. USB Connector 22. DSP External Control Header 23. DSP DAI Header 24. +1.8V Header 25. Power LEDs (4) 26. + 3.3V Header 图7{京电港论坛} CDB47xxx-DC48 子板岁对应的元件: 1. Cirrus Logic CS47048 DSP 2. Power LEDs (2) 3. MCLK-XTAL_OUT Header 4. DSP GPIO Button 5. DSP GPIO LED 6. DSP GPIO LED 7. DSP GPIO Switch 8. +1.8VD Probe Point 9. +3.3VD Probe Point 10. +1.8VA Probe Point 11. +3.3VA Probe Point |
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