ADI公司的ADAU1787是集成了兩個數字信號處理器（DSP）的具有四個輸入和兩個輸出的編譯碼器（CODEC）.ADAU1787具有可編程的FastDSP音頻處理引擎，高達768kHz取樣速率，雙二階濾波器，限制器，音量控制和混合; ADAU1787還集成了SigmaDSP音頻處理核，高達50MIPS性能，低延遲24位ADC和DAC.主要特性還具有96dB信噪比（SNR）（信號通過PGA和ADC與A加權濾波器）以及105dB組合SNR（信號通過DAC和耳機與A加權濾波器），串口fSYNC頻率從8kHz到192kHz，模擬進到模擬出的群時延為5 μs （fS = 768 kHz），4個單端模擬輸入，可配置麥克風或線輸入，8個數字麥克風輸入，2個模擬差分音頻輸出可配置成線輸出或耳機驅動器，鎖相環（PLL）支持30kHz到27MHz任何輸入時鐘速率，主要用在降噪手持機和耳機，藍牙ANC手持機和耳機，個人導航設備（PND），數碼相機和攝像機，音樂樂器效果處理器，多媒體揚聲器系統和智能手機。本文介紹了ADAU1787主要特性，框圖和系統框圖以及評估板EVAL-ADAU1787Z主要特性，電路圖，材料清單和PCB設計圖。

　　The ADAU1787 is a codec with four inputs and two outputs that incorporates two digital signal processors （DSPs）。 The path from the analog input to the DSP core to the analog output is optimized for low latency and is ideal for noise cancelling headsets. With the addition of just a few passive components， the ADAU1787 provides a complete headset solution.

　　Note that throughout this data sheet， multifunction pins， such as BCLK_0/MP1， are referred to either by the entire pin name or by a single function of the pin， for example， BCLK_0， when only that function is relevant.

　　ADAU1787主要特性：

　　Programmable FastDSP audio processing engine

　　Up to 768 kHz sample rate

　　Biquad filters， limiters， volume controls， mixing

　　28-bit SigmaDSP audio processing core

　　Visually programmable using SigmaStudio

　　Up to 50 MIPS performance

　　Low latency， 24-bit ADCs and DACs

　　96 dB SNR （signal through PGA and ADC with A-weighted filter）

　　105 dB combined SNR （signal through DAC and headphone with A-weighted filter） Serial port fSYNC frequency from 8 kHz to 192 kHz

　　5 μs group delay （fS = 768 kHz） analog in to analog out with FastDSP bypass

　　4 single-ended analog inputs， configurable as microphone or line inputs

　　8 digital microphone inputs

　　2 analog differential audio outputs， configurable as either line output or headphone driver

　　PLL supporting any input clock rate from 30 kHz to 27 MHz

　　Full-duplex， 4-channel ASRCs

　　2，16-channel serial audio ports supporting I2S， left justified，or up to TDM16

　　8 interpolators and 8 decimators with flexible routing

　　Power supplies

　　Analog AVDD at 1.8 V typical

　　Digital I/O IOVDD at 1.1 V to 1.98 V

　　Digital DVDD at 0.9 V typical

　　Low power （11.027 mW for typical stereo noise cancelling solution）

　　I2C and SPI control interfaces， self boot from I2C EEPROM

　　Flexible GPIO

　　42-ball， 0.35 mm pitch， 2.695 mm × 2.320 mm WLCSP

　　ADAU1787應用：

　　Noise cancelling handsets， headsets， and headphones

　　Bluetooth ANC handsets， headsets， and headphones

　　Personal navigation devices

　　Digital still and video cameras

　　Musical instrument effect processors

　　Multimedia speaker systems

　　Smartphones

　　圖1. ADAU1787框圖

　　圖2. ADAU1787系統框圖：模擬麥克風，自舉模式

　　評估板EVAL-ADAU1787Z

　　This user guide explains the design and setup of the EVAL-ADAU1787Z evaluation board. This evaluation board provides access to all analog and digital inputs/outputs on the ADAU1787. The ADAU1787 core is controlled by Analog Devices， Inc.， SigmaStudio? software， which interfaces to the EVAL-ADAU1787Z via a USB connection. The EVAL-ADAU1787Z can be powered by the USB bus or by a single 3.8 V to 5 V supply. Any of these supplies are regulated to the voltages required on the EVAL-ADAU1787Z. The printed circuit board （PCB） is a 6-layer design， with a ground plane and a power plane on the inner layers. The EVAL-ADAU1787Z contains connectors for external microphones and speakers. The master clock can be provided externally or by the on-board 24.576 MHz passive crystal.

　　Multifunction pin names may be referenced by their relevant function only， for example， MPx， throughout this user guide.

　　評估板EVAL-ADAU1787Z包括：

　　EVAL-ADAU1787Z evaluation board

　　EVAL-ADUSB2EBZ （USBi） communications adapter

　　USB cable with mini USB plug

　　圖3.評估板EVAL-ADAU1787Z外形圖

　　圖4.評估板EVAL-ADAU1787Z PCB跳線和開關設定圖

　　圖5.評估板EVAL-ADAU1787Z電路圖（1）：ADAU1787

　　圖6.評估板EVAL-ADAU1787Z電路圖（2）：電源

　　評估板EVAL-ADAU1787Z材料清單：

　　圖7.評估板EVAL-ADAU1787Z PCB設計圖（1）：頂層裝配

　　圖8.評估板EVAL-ADAU1787Z PCB設計圖（2）：頂層銅

　　圖9.評估板EVAL-ADAU1787Z PCB設計圖（3）：地平面

　　圖10.評估板EVAL-ADAU1787Z PCB設計圖（4）：電源面

　　圖11.評估板EVAL-ADAU1787Z PCB設計圖（5）：層4銅

　　圖12.評估板EVAL-ADAU1787Z PCB設計圖（6）：層5銅

　　圖13.評估板EVAL-ADAU1787Z PCB設計圖（7）：層6底銅

　　詳情請見：

　　https://www.analog.com/media/en/technical-documentation/data-sheets/ADAU1787.pdf

　　和https://www.analog.com/media/en/technical-documentation/user-guides/EVAL-ADAU1787Z-UG-1532.pdf