ADI ADAU1462SigmaDSP汽车音频处理方案

　　ADI公司的ADAU1462/ADAU1466是汽车级音频处理器,其数字信号处理能力大大超过以前的SigmaDSP®器件.其音频处理算法支持流处理,多速率处理和块处理范例无缝组合,核电压1.2V,32位DSP核工作频率高达294.912 MHz,取样速率48kHz时高达6144 SIMD指令/取样,高达1600ms数字音频延迟池.集成了24KB程序存储器,80KB参数/数据RAM,有四个串行输入端口和4个串行输出端口,主要用在汽车音频处理如音响主机,导航系统,后座娱乐系统,DSP放大器(音响系统放大器),商用和专业的音频处理.本文介绍了ADAU1462/6主要特性,功能框图和系统框图,以及评估板EVAL-ADAU1466Z主要特性,框图,电路图,材料清单和PCB设计图.

　　The ADAU1462/ADAU1466 are automotive qualified audio processors that far exceed the digital signal processing capabilities of earlier SigmaDSP® devices. They are pin and register compatible with each other, as well as with the ADAU1450/ADAU1451/ADAU1452 SigmaDSP processors. The restructured hardware architecture is optimized for efficient audio processing. The audio processing algorithms support a seamless combination of stream processing (sample by sample), multirate processing, and block processing paradigms. The SigmaStudio™ graphical programming tool enables the creation of signal processing flows that are interactive, intuitive, and powerful. The enhanced digital signal processor (DSP) core architecture enables some types of audio processing algorithms to be executed using significantly fewer instructions than were required on previous SigmaDSP generations, leading to vastly improved code efficiency.

　　The 1.2 V, 32-bit DSP core can run at frequencies of up to 294.912 MHz and execute up to 6144 SIMD instructions per sample at the standard sample rate of 48 kHz. Powerful clock generator hardware, including a flexible phase-locked loop (PLL) with multiple fractional integer outputs, supports all industry standard audio sample rates. Nonstandard rates over a wide range can generate up to 15 sample rates simultaneously. These clock generators, along with the on board asynchronous sample rate converters (ASRCs) and a flexible hardware audio routing matrix, make the ADAU1462/ADAU1466 ideal audio hubs that greatly simplify the design of complex multirate audio systems.

　　The ADAU1462/ADAU1466 interface with a wide range of analog-to-digital converters (ADCs), digital-to-analog converters (DACs), digital audio devices, amplifiers, and control circuitry with highly configurable serial ports, I2C, serial peripheral interface (SPI), Sony/Philips Digital Interconnect Format (S/PDIF) interfaces, and multipurpose input/output(I/O) pins. Dedicated decimation filters can decode the pulse code modulation (PDM) output of up to four MEMS microphones. Independent slave and master I2C/SPI control ports allow the ADAU1462/ADAU1466 to be programmed and controlled by an external master device such as a microcontroller, and to program and control slave peripherals directly. Self boot functionality and the master control port enable complex standalone systems.

　　The power efficient DSP core can execute at high computational loads while consuming only a few hundred milliwatts (mW) in typical conditions. This relatively low power consumption and small footprint make the ADAU1462/ADAU1466 ideal replacements for large, general-purpose DSPs that consume more power at the same processing load. Note that throughout this data sheet, multifunction pins, such as SS_M/MP0, are referred to either by the entire pin name or by a single function of the pin, for example, MP0, when only that function is relevant.

　　ADAU1462/6主要特性:

　　Qualified for automotive applications

　　Fully programmable audio DSP for enhanced sound processing

　　Features SigmaStudio, a proprietary graphical programming tool for the development of custom signal flows

　　Up to 294.912 MHz, 32-bit SigmaDSP core at 1.2 V

　　Up to 24 kWords of program memory

　　Up to 80 kWords of parameter/data RAM

　　Up to 6144 SIMD instructions per sample at 48 kHz

　　Up to 1600 ms digital audio delay pool at 48 kHz

　　Audio I/O and routing

　　4 serial input ports, 4 serial output ports

　　48-channel, 32-bit digital I/O up to a sample rate of 192 kHz

　　Flexible configuration for TDM, I2S, left and right justified formats, and PCM

　　Up to 8 stereo ASRCs from 1:8 up to 7.75:1 ratio and 139 dB dynamic range

　　Stereo S/PDIF input and output at 192 kHz

　　Four PDM microphone input channels

　　Multichannel, byte addressable TDM serial ports processing

　　ADAU1462/6应用:

　　Automotive audio processing

　　Head units

　　Distributed amplifiers

　　Rear seat entertainment systems

　　Trunk amplifiers

　　Commercial and professional audio processing

　　图1.ADAU1462/6功能框图

　　图2.ADAU1462/6带外接元件连接的系统框图

　　评估板EVAL-ADAU1466Z

　　This user guide details the design, setup, and operation of the EVAL-ADAU1466Z evaluation board. This device is suitable for evaluation of, and software development for, the ADAU1466 and ADAU1462 SigmaDSP processors. Note that the ADAU1466 and the ADAU1462 are functionally identical, except that the ADAU1466 has more program and data memory than the ADAU1462. When using this evaluation board to evaluate the ADAU1462, in the Setting Up Communications in SigmaStudio section, select the ADAU1462 block rather than the ADAU1466 as shown in Figure 15. Performing this action informs the compiler to limit the amount of memory allocated to match the ADAU1462. All other procedures and instructions in this user guide are identical for the ADAU1462 and ADAU1466.

　　This evaluation board provides access to the digital serial audio ports of the ADAU1466, as well as some of its general-purpose input/outputs (GPIOs). An analog input and output is provided by the AD1938 codec that is included in the evaluation kit. The ADAU1466 core is programmed using Analog Devices, Inc., SigmaStudio® software, which interfaces to the evaluation board via a USB interface (USBi). The on-board EEPROM can be programmed for self boot mode. The evaluation board is powered by a 6 V dc supply, which is regulated to the voltages required on the board. The printed circuit board (PCB) is a 4-layer design, with a ground plane and a power plane on the inner layers. The evaluation board includes connectors for external analog inputs and outputs, and optical Sony/Philips Digital Interface (S/PDIF) interfaces. The master clock is provided by the integrated oscillator circuit and the on-board 12.288 MHz passive crystal.

　　评估板EVAL-ADAU1466Z主要特性:

　　4 analog inputs

　　8 analog outputs

　　Stereo S/PDIF input and output

　　Self boot EEPROM memory

　　EVALUATION KIT CONTENTS

　　EVAL-ADAU1466Z evaluation boardaaaaaaa

　　EVAL-ADUSB2EBZ (USBi) communications adapter

　　USB cable with Mini-B plug

　　6 V ac to dc power supply

　　图3.评估板EVAL-ADAU1466Z外形图

　　图4.评估板EVAL-ADAU1466Z功能框图

　　图5.评估板EVAL-ADAU1466Z布局框图

　　图6.评估板EVAL-ADAU1466Z电路图:SigmaDSP音频处理器

　　图7.评估板EVAL-ADAU1466Z电路图:自举电路

　　图8.评估板EVAL-ADAU1466Z电路图:S/PDIF光接口

　　图9.评估板EVAL-ADAU1466Z电路图:静态LED

　　图10.评估板EVAL-ADAU1466Z电路图:DIP开关

　　图11.评估板EVAL-ADAU1466Z电路图:AUXADC电位计

　　图12.评估板EVAL-ADAU1466Z电路图:AD1938音频CODEC

　　图13.评估板EVAL-ADAU1466Z电路图:电源

　　图14.评估板EVAL-ADAU1466Z电路图:重置发生器电路

　　图15.评估板EVAL-ADAU1466Z电路图:SPI通信接口插座

　　图16.评估板EVAL-ADAU1466Z电路图:模拟输入通路0和1

　　图17.评估板EVAL-ADAU1466Z电路图:模拟输入通路16和17

　　图18.评估板EVAL-ADAU1466Z电路图:模拟输出通路0和1

　　图19.评估板EVAL-ADAU1466Z电路图:模拟输出通路16和17

　　图20.评估板EVAL-ADAU1466Z电路图:模拟输出通路32和33

　　图21.评估板EVAL-ADAU1466Z电路图:模拟输出通路40和41

　　图22.评估板EVAL-ADAU1466Z电路图:去耦电容

　　评估板EVAL-ADAU1466Z材料清单:

　　图23.评估板EVAL-ADAU1466Z PCB布局图:顶层装配图

　　图24.评估板EVAL-ADAU1466Z PCB布局图:顶层铜

　　图25.评估板EVAL-ADAU1466Z PCB布局图:地平面

　　图26.评估板EVAL-ADAU1466Z PCB布局图:电源平面

　　图27.评估板EVAL-ADAU1466Z PCB布局图:底层铜

　　图28.评估板EVAL-ADAU1466Z PCB布局图:底层装配图

　　Analog Devices, Inc.(简称ADI)。中国注册公司名字为“亚德诺半导体技术(上海)有限公司。美国纳斯达克上市公司 (NASDAQ代码: ADI)。

　　将创新、业绩和卓越作为企业的文化支柱，并基此成长为该技术领域最持久高速增长的企业之一。ADI公司是业界认可的数据转换和信号处理技术全球领先的供应商，拥有遍布世界各地的60,000客户，涵盖了全部类型的电子设备制造商。作为领先业界40多年的高性能模拟集成电路(IC)制造商，ADI的产品用于模拟信号和数字信号处理领域。

　　公司总部设在美国马萨诸塞州诺伍德市，设计和制造基地遍布全球。ADI公司被纳入标准普尔500指数(S&P 500 Index)。

　　在科技革命的推动下，人类社会开启工业化革命的进程，客观上促进了经济全球化及城市化的进一步发展。全球化对通信技术提出了更高挑战，城市化的趋势则对交通等基础设施提出了更高的要求。与此同时，传统能源大量消耗带来的全球气候变暖及资源稀缺问题，人口老龄化的加速对医疗行业提出的更高要求，无疑都是当今面临的挑战。半导体技术的快速发展将在应对这些变化所带来的挑战中扮演重要的角色。ADI公司以创新为基石，致力于通信基础设施、工业自动化、工业仪表、汽车电子以及医疗保健等领域的研发与投入，为解决各行各业面对的挑战，提供高性能的产品及解决方案。

　　客户面临最终挑战是向市场推出具有竞争优势的产品。因此，面对的挑战是提高性能、精度、速度和集成度，降低器件尺寸、能耗和价格，与客户更有效紧密地开展合作—这一切均能进一步提高创新能力。由于ADI专注于创造更具创新、更可靠的产品，ADI不仅将持续处于技术领先地位，还将证明，ADI的产品的与众不同是为客户创造巨大价值的关键所在。AD阵容不断扩大的创新产品有：放大器和线性产品、数据转换器、音频和视频产品、宽带产品、时钟和定时IC、光纤和光通信产品、接口和隔离、MEMS和传感器、电源和散热管理、处理器和DSP、RF和IF ICs、开关和多路复用器等等。

　　在可穿戴电子领域，ADI拥有一系列创新产品和解决方案，例如支持多种便携式医疗保健领域的高精度、低功耗片上计量仪ADuCM350已在国内和国外的几家有代表性的大客户中都取得里程碑式的进展;

　　突破性的超低功耗3轴数字MEMS产品ADXL362在运动检测唤醒模式下功耗仅为300 nA，其超低功耗的特征是可穿戴运动监测设备的理想解决方案;低功耗、单导联、心率监护仪模拟前端(AFE) AD8232，专为满足新兴的健身设备、便携式/佩戴式监控设备和远程健康监护设备的ECG信号调理要求而设计;

　　详情请见:

EVAL-ADAU1466Z_UG-1135.pdf

ADAU1462-1466.pdf