Cirrus公司的CS470xx系列是高性能后處理以及混合模擬和數字音頻的音頻系統級芯片(ASOC).具有高性價比的32位DSP, 300,000,000 MAC/S(每秒乘發運算),業界精度最高的72位居累加器,雙路時鐘域支持DAI和SPDIF RX一起輸入,集成的取樣速率轉換器(SRC)允許音頻流以不同的確取樣速率混合.集成的8路24位DAC的動態范圍(DR)為108dB,THD+N為-98dB,4路24位ADC的DR為105dB,THD+N為-98dB,主要用于汽車音頻放大器,汽車處理器,DTV,MP3塢站,AVR和DVD RX, DSP控制的揚聲器.本文介紹了CS470xx 系列主要特性,方框圖,CDB47xxxS主板方框圖,電路圖與主要元件, CDB47xxx-DC48子板方框圖,電路圖與主要元件.
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 系列典型應用:
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)
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 (–40℃ to +85℃) temperature grades.
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 24-bit DAC output: 108dB DR, –98 dB THD+N
4† Channels of 24-bit 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 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
圖1.CS47048方框圖
圖2.CDB47xxxS-DCxx開發套件外形圖
圖3.CDB47xxxS主板方框圖
圖4.CDB47xxx-DC48子板方框圖
圖5.CDB47xxx-DC28子板方框圖
圖6.CDB47xxxS (單端)主板外形圖:頂視圖
圖6 CDB47xxxS (單端)主板對應的元件:
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
圖7.CDB47xxx-DC48 子板外形圖:頂視圖
圖7 CDB47xxx-DC48 子板歲對應的元件:
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
圖8.CDB47xxxS (單端)子板連接器電路圖
圖9.CDB47xxxS (單端)數字音頻控制連接器電路圖
圖10.CDB47xxxS (單端)串行存儲器電路圖
圖11.CDB47xxxS (單端)麥克風前置放大器電路圖
圖12.CDB47xxxS (單端)電源連接器電路圖
圖13.CDB47xxxS (單端)ADC濾波器電路圖
圖14.CDB47xxxS (單端)DAC濾波器電路圖
圖15.CDB47xxxS (單端)MCU卡接口電路圖
圖16.CDB47xxxS (單端)MCU卡用戶接口電路圖(1)
圖17.CDB47xxxS (單端)MCU卡用戶接口電路圖(2)
圖18.CDB47xxx-DC48子板框圖
圖19.CDB47xxx-DC48子板電路圖 |
