Cirrus公司的CS470xx系列是新一代音頻系統級芯片(ASOC)32位處理器,每秒的乘法運算(MAC/S)為300,000,000,目標應用在高保真對成本敏感的設計.該系列集成了S/PDIF Rx, S/ PDIF Tx,模擬輸入,模擬輸出和取樣速率轉換器(SRC),能簡化系統設計和降低系統總成本.主要應用在汽車音響,DTV,MP3塢站,AVR和DVD Rx, DSP控制的揚聲器(條形音箱,低音擴音箱).本文介紹了CS470xx系列主要特性, CS47048方框圖, CDB47xxxD主板和子板方框圖以及詳細電路圖.
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系列目標應用:
? 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)
圖1.CS47048方框圖
圖2.CDB47xxxD-DCxx開發板外形圖
圖3.CDB47xxxD主板方框圖
圖4.CDB47xxx-DC48子板方框圖
圖5.CDB47xxD差分板方框圖
圖6.CDB47xxD(差分)子板連接器
圖7.CDB47xxD(差分)數字音頻控制連接器
圖8.CDB47xxD(差分)數字串行閃存
圖9.CDB47xxD(差分)麥克風前置放大器
圖10.CDB47xxD(差分)電源連接器
圖11.CDB47xxD(差分)ADC濾波器
圖12.CDB47xxD(差分)電壓輸出電路
圖13.CDB47xxD(差分)MCU卡接口
圖14.CDB47xxD(差分)MCU卡電路
圖15.CDB47xxD(差分)MCU卡用戶接口
圖16. CDB47xxx-DC48子板框圖
圖17. CDB47xxx-DC48子板電路圖
詳情請見:
http://www.cirrus.com/en/pubs/proDatasheet/CS470xx_F1.pdf
和
http://www.cirrus.com/en/pubs/manual/CDB470xx_UM_DB6.pdf