ADAU1445:SigmaDSP® 数字音频处理器，内置灵活的音频路由矩阵
ADAU1445/ADAU1446均为增强型音频处理器，可以非常灵活地路由所有输入和输出信号。SigmaDSP®内核具有下列特性：完全28位处理（双精度模式下为56位），同步加载参数以确保滤波器稳定，以及利用SigmaStudio™工具实现100%编码效率。系统设计人员可以利用这款DSP，通过扬声器均衡、多频段压缩、限幅和第三方算法来弥补扬声器、功放和听音环境的实际限制，从而明显改善音质体验。
借助灵活的音频路由矩阵(FARM)，用户可以多路复用多个来源、以各种不同采样速率进出SigmaDSP内核的输入，从而简化音频系统中的信号路由和时钟问题。FARM包含最多八个立体声异步采样速率转换器（取决于器件型号）、索尼/飞利浦数字互连格式(S/PDIF)输入和输出，以及串行(I2S)和时分多路复用(TDM) I/O。任何一路输入均可路由至SigmaDSP内核或任何一个异步采样速率转换器(ASRC)。同样，任何一路输出信号均可从SigmaDSP内核或任何一路ASRC输出获得。这种路由方案可以随时通过控制寄存器进行修改，赋予音频系统极大的灵活性。ADAU1445与ADAU1446仅ASRC功能和封装不同。ADAU1445内置16通道ASRC，采用TQFP封装，而ADAU1446则不含ASRC，采用LQFP封装。ADAU1445/ADAU1446可通过两种工作模式进行控制：第一种，通过SPI/I2C®端口加载和动态更新芯片的设置；第二种，在无微控制器的系统中，DSP从外部EEPROM自行引导。另外还有一些多功能(MP)引脚，可以用作通用数字I/O，或者用作4通道辅助控制ADC的输入。SigmaStudio图形开发环境支持ADAU1445/ADAU1446。该软件含有FIR和IIR滤波器、动态处理器、混频器、低层次DSP功能以及第三方算法等音频处理模块，可快速开发自定义信号流程。
The ADAU1445/ADAU1446 are enhanced audio processors that allow full flexibility in routing all input and output signals. The SigmaDSP® core features full 28-bit processing (56-bit in double-precision mode), synchronous parameter loading for ensuring filter stability, and 100% code efficiency with the SigmaStudio™ tools. This DSP allows system designers to compensate for the real-world limitations of speakers, amplifiers, and listening environments, resulting in a dramatic improvement of the perceived audio quality through speaker equalization, multi-band compression, limiting, and third-party branded algorithms.
The flexible audio routing matrix (FARM) allows the user to multiplex inputs from multiple sources running at various sample rates to or from the SigmaDSP core. This drastically reduces the complexity of signal routing and clocking issues in the audio system. FARM includes up to eight stereo asynchronous sample rate converters (depending on the device model), Sony/ Philips Digital Interconnect Format (S/PDIF) input and output, and serial (I2S) and time division multiplexing (TDM) I/Os. Any of these inputs can be routed to the SigmaDSP core or to any of the asynchronous sample rate converters (ASRCs). Similarly, any one of the output signals can be taken from the SigmaDSP core or from any of the ASRC outputs. This routing scheme, which can be modified at any time via control registers, allows for maximum system flexibility.The ADAU1445 and ADAU1446 differ only in ASRC functionality and packaging. The ADAU1445 contains 16 channels of ASRCs and is packaged in a TQFP, whereas the ADAU1446 contains no ASRCs and is packaged in an LQFP.The ADAU1445/ADAU1446 can be controlled in one of two operational modes. First, the settings of the chip can be loaded and dynamically updated through the SPI/I²C® port. Second, the DSP can self-boot from an external EEPROM in a system with no microcontroller. There is also a bank of multipurpose (MP) pins that can be used as general-purpose digital I/Os or as inputs to the 4-channel auxiliary control ADC.The ADAU1445/ADAU1446 are supported by the SigmaStudio graphical development environment. This software includes audio processing blocks such as FIR and IIR filters, dynamics processors, mixers, low level DSP functions, and third-party algorithms for fast development of custom signal flows.
ADAU1445 特点
- 完全可编程的音频数字信号处理器(DSP)，可改善声音处理性能
- 可利用专有图形编程工具SigmaStudio™开发自定义信号流程
- SigmaDSP内核频率：172 MHz；每个样本指令数：3584 (48 kHz)
- 4k参数RAM，8k数据RAM
- 灵活的音频路由矩阵(FARM) 24通道数字输入和输出 两个8通道异步采样速率转换器（采样比范围：1:8至7.75:1，动态范围：139 dB）立体声S/PDIF输入和输出
- 支持串行和TDM I/O，fS最高可达192 kHz
- 欲了解更多信息，请参考数据手册
- Fully programmable audio digital signal processor (DSP) for enhanced sound processing
- Features SigmaStudio™, a proprietary graphical programming tool for the development of custom signal flows
- 172 MHz SigmaDSP core; 3584 instructions per sample at 48 kHz
- 4k parameter RAM, 8k data RAM
- Flexible audio routing matrix (FARM) 24-channel digital input and output Two 8-channel asynchronous sample rate converters (from 1:8 up to 7.75:1 ratio and 139 dB DNR) Stereo S/PDIF input and output
- Supports serial and TDM I/O, up to fS = 192 kHz
- See data sheet for additional information
ADAU1445技术指标
- Instructions/Cycles: 3584
- Digital I/O Channels: 24/24
- Analog I/O Channels: 0/0
- Product Description: Digital audio processor with flexible audio routing matrix, 8 × 2-channel ASRC
ADAU1445 应用领域
- 汽车音频处理
音响主机
导航系统
后座娱乐系统
DSP放大器（音响系统放大器） - 商用音频处理
- Automotive audio processing
Head units
Navigation systems
Rear-seat entertainment systems
DSP amplifiers (sound system amplifiers) - Commercial audio processing
ADAU1445 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| ADAU1445YSVZ-3A | 量产 | 100 | 汽车级 | |
| ADAU1445YSVZ-3A-RL | 量产 | 100 | 汽车级 |