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ADI公司的ADAU1373是低功耗立體聲CODEC,集成了數(shù)字音頻處理,支持立體聲48kHz錄音和播放,立體聲ADC和DAC支持取樣速率從8kHz到48kHz以及數(shù)字音量控制,帶PGA的八個單端或四個差分輸入提供增益從-12dB到+18dB.48kHz和1.8V錄音功耗7mW,播放功耗6mW,主要用在手機,平板電腦,電子書,手持媒體播放器.本文介紹了ADAU1373主要特性,方框圖, 立體聲D類應用電路圖以及ADAU1373評估板電路圖,材料清單和PCB元件布局圖. ADAU1373是一個低功耗集成數(shù)字音頻處理，支持立體聲48 kHz錄音和播放。立體聲音頻編解碼器（ADCs）和DAC支持采樣率從8 kHz~48 kHz，具有數(shù)字音量控制。 該器件提供了8個單端，或4個差分模擬輸入與PGA，可調(diào)整-12 dB~+18 dB的增益。并可以配置用于麥克風或線路電平信號。 支持兩個數(shù)字立體聲麥克風輸入，總共可以連接4個數(shù)字麥克風。此外，還提供了三個串行數(shù)字音頻輸入/輸出端口，并具有異步采樣率轉(zhuǎn)換器（ASRCs），以支持不同的采樣率，使得手機應用系統(tǒng)設計更加靈活。在ADC之前（或配置成繞過ADC）可以混合，或選擇輸入。還包括兩個立體聲DAC，具有靈活的內(nèi)部信號路由的混合選項。 
圖1 ADAU1373功能方框圖 模擬輸出端包括線路輸出、耳機輸出、揚聲器輸出和接收器輸出。還包括兩個單端立體聲線路電平輸出，可配置為兩個差分輸出。耳機輸出為真實立體聲，省去了耦合電容器，并具有高效G類，Class-G，（軌道開關）架構。高效的立體聲，無濾波器，D類開關放大器提供了1W的立體聲揚聲器功率。差分接收器放大器可以用來連接獨立的接收器揚聲器。兩個PLL模塊，可鎖定從8 kHz~27 MHz的輸入。 DSP可以讓系統(tǒng)設計師們對麥克風、揚聲器、放大器和聽音環(huán)境的現(xiàn)實限制進行補償，通過均衡化、多頻帶壓縮和限制算法，使得音頻質(zhì)量顯著改善。用于快速開發(fā)自定義信號流的SigmaStudio圖形開發(fā)工具，包括，音頻處理模塊，如濾波器、混頻器、動態(tài)處理器和放大器，還可用于ADAU1373編程。
圖1 ADAU1373功能方框圖 ADAU1373主要特性 • 1個立體聲ADC和2個立體聲DAC，采樣率從8kHz~48 kHz •低功耗：1.8 V時為，7 mW錄音，6MW播放，48 kHz • 8個單端，或4路差分輸入，PGA • 2個麥克風偏置參考電壓，具有電流檢測 • 2個立體聲數(shù)字麥克風輸入 •靈活的模擬輸入/輸出混頻器 • 1個立體聲差分，或2個立體聲單端線路輸出 •真正的地居中立體聲G類耳機放大器，在1.8 V，10％THD時，能夠?qū)崿F(xiàn)2×50 MW ，16Ω •無濾波器立體聲，D類揚聲器放大器，在3.6 V，10％THD時，能夠?qū)崿F(xiàn)2×880 MW，8Ω，差分耳機放大器能夠驅(qū)動32Ω • 2個鎖相環(huán)支持從8 kHz~27 MHz的輸入時鐘 • I2C控制接口 •數(shù)字音頻處理 • 3個數(shù)字音頻輸入和輸出端口與ASRC • I2S，PCM的，右對齊，左對齊模式 • 4.05mm×3.82mm，81球，0.4 mm間距WLCSP封裝 • -40℃~+85℃的工作溫度范圍 ADAU1373應用 •手機 •平板電腦 •電子書 •便攜式媒體播放器 ADAU1373評估板 ADAU1373是一款低功耗的音頻編解碼器，支持立體聲錄制和播放。它提供了8個單端或四個差分模擬輸入和PGA增益調(diào)整。它支持兩個立體聲數(shù)字麥克風輸入，這樣，總共可以連接4個數(shù)字麥克風。此外，它還提供了三個串行數(shù)字音頻輸入/輸出端口和ASRCs，以支持不同的采樣率，使其具有靈活的系統(tǒng)設計。 其模擬輸出端包括線路輸出、耳機輸出、喇叭輸出和一個接收器輸出。具有兩個立體聲單端線路電平輸出，可配置為兩個差分輸出。其耳機輸出是立體聲，真正的地中心，具有高效G類架構。其高效立體聲免濾波器D類開關放大器，提供了約1 W的立體聲揚聲器功率。差分接收器放大器可以用來連接獨立的接收器，揚聲器。
圖3 ADAU1373評估板電路圖 ADAU1373評估板包括了ADAU1373完整的應用電路。該板具有USBI連接，連接到SigmaStudio圖形開發(fā)工具，以運行PC主機，可用來編程ADAU1373。 用戶指南包括了ADAU1373評估板的詳細描述。建議同時閱讀ADAU1373數(shù)據(jù)表和本用戶指南。ADAU1373數(shù)據(jù)表包括了有關的全部細節(jié)，它提供了編解碼器IC的更詳細的信息規(guī)范、內(nèi)部框圖和應用指導。 The ADAU1373 is a low power, stereo audio codec with integrated digital audio processing that supports stereo 48 kHz record and playback. The stereo audio ADCs and DACs support sampling rates from 8 kHz to 48 kHz, as well as a digital volume control. Eight single-ended or four differential analog inputs with PGAs are provided for adjusting the gain from −12 dB to +18 dB. They can be configured for microphones or line level signals. Two stereo digital microphone inputs are supported; four digital microphones can be connected in total. In addition, three serial digital audio input/output ports are provided with asynchronous sample rate converters (ASRCs) to support various sampling rates, allowing for flexible system design in mobile phone applications. The inputs can be mixed and selected before the ADC or con-figured to bypass the ADC. Two stereo DACs are included, with a flexible mixing option for routing the signals internally. The analog output side consists of line outputs, headphone output, speaker output, and receiver output. Two stereo single-ended line level outputs, which can be configured as two differential outputs, are included. The headphone output is stereo true ground centered (eliminating the need for coupling capacitors), with efficient Class-G (rail switching) architecture. The efficient stereo filterless Class-D switching amplifier provides ~1 W of stereo power for speakers. The differential receiver amplifier can be used to connect the separate receiver speaker. Two PLL blocks, which can lock to the inputs from 8 kHz to 27 MHz, are included. The DSP allows system designers to compensate for the real-world limitations of microphones, speakers, amplifiers, and listening environments, resulting in a dramatic improvement in perceived audio quality through equalization, multiband compression, and limiting algorithms. The SigmaStudio™ graphical development tool, which includes audio processing blocks such as filters, mixers, dynamics processors, and amplifiers for fast development of custom signal flows, is used to program the ADAU1373. ADAU1373主要特性: 1 stereo ADC and 2 stereo DACs with sampling rates from 8 kHz to 48 kHz Low power: 7 mW record, 6 mW playback, 48 kHz at 1.8 V 8 single-ended or 4 differential inputs with PGA 2 microphone bias reference voltages with current sense 2 stereo digital microphone inputs Flexible analog input/output mixers 1 stereo differential or 2 stereo single-ended line outputs True ground-centered stereo Class-G headphone amplifier, capable of 2 × 50 mW into 16 Ω at 1.8 V, 10% THD Filterless stereo Class-D speaker amplifier, capable of 2 × 880 mW into 8 Ω at 3.6 V, 10% THD Differential earpiece amplifier capable of driving 32 Ω 2 PLLs, supporting input clocks from 8 kHz to 27 MHz I2C control interface Digital audio processing 3 digital audio input and output ports with ASRC I2S, PCM, right-justified, left-justified modes 4.05 mm × 3.82 mm, 81-ball, 0.4 mm pitch WLCSP package −40℃ to +85℃ operating temperature range ADAU1373應用: Mobile phones, tablet PCs, e-books, portable media players
圖1. ADAU1373功能方框圖
圖2. ADAU1373典型立體聲D類應用電路圖 ADAU1373評估板 The ADAU1373 is a low power audio codec that supports stereo record and playback. It provides eight single-ended or four differential analog inputs with PGA for adjusting the gain. The support for two stereo digital microphone inputs is provided so that, in total, four digital microphones can be connected. In addition, three serial digital audio in/out ports are provided with ASRCs to support various sampling rates at the input/output ports, allowing flexible system design. The analog output side consists of line outputs, a headphone output, a speaker output, and a receiver output. The two stereo single-ended line level outputs are included, which can be configured as two differential outputs. The headphone output is stereo true-ground-centered with efficient Class-G architecture. The efficient stereo filterless Class-D switching amplifier pro-vides around 1 W stereo power for speakers. The differential receiver amplifier can be used to connect the separate receiver speaker. The ADAU1373 evaluation board includes the complete application circuit for the ADAU1373. The board is featured with USBi connection to the SigmaStudio™ graphical develop-ment tool running on a host PC, which is used to program the ADAU1373. Included in this user guide is a detailed description for the ADAU1373 evaluation board. It is recommended that the ADAU1373 data sheet be read along with this user guide. Full details about the part are available in the ADAU1373 data sheet, which provides more detailed information about the specifica-tions, internal block diagrams, and application guidance for the codec IC.
圖3. ADAU1373評估板電路圖(1)
圖4. ADAU1373評估板電路圖(2)
圖5. ADAU1373評估板電路圖(3)
圖6. ADAU1373評估板電路圖(4)
圖7. ADAU1373評估板電路圖(5)
圖8. ADAU1373評估板電路圖(6)
圖9. ADAU1373評估板電路圖(7)
圖10. ADAU1373評估板電路圖(8)
圖11. ADAU1373評估板電路圖(9) ADAU1373評估板材料清單:
圖12. ADAU1373評估板電源部分
圖13. ADAU1373評估板數(shù)字音頻接口和風細雨數(shù)字麥克風接口部分 詳情請見: 
ADAU1373.pdf
(7.81 MB)
UG-284.pdf
(3.16 MB)
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