ADI公司的ADAU1850是具有三個輸入和一個輸出的集成了數字信號處理器的編譯碼器(CODEC).從模擬輸入到DSP核到模擬輸出的通路經過優化,具有低等待時間,非常適合于降噪音耳機使用.只需要增加少許無源元件, ADAU1850提供了完整的耳機解決方案. ADAU1850具有可編程的FastDSP音頻處理引擎,高達768kHz取樣速率,具有Biquad濾波器,限幅器,音量控制和混合等功能,低等待時間的24位ADC和DAC,106dB SNR(信號通過ADC和A加權濾波器),串口取樣速率從8kHz到768kHz,模擬到模擬群時延為5 μs,可編程雙精度MAC引擎用于13級均衡器,3個模擬輸入(2個差分和一個單端),可配置成麥克風或線輸入.模擬差分風音頻輸出,可配置成線路輸出或耳機驅動器,PLL支持30 kHz到27 MHz的任何輸入時鐘,1路ASRCI,三路ASRCO,串行音頻端口支持I2S,左對齊,或高達16路TDM (TDM16),具有靈活路經的兩個插值器和4個抽取器.模擬AVDD電源電壓為1.8V.數字I/O IOVDD電壓為1.8V到3.3V.通信接口為I2C,SPI和UART.采用28點0.4mm間隔2.957 mm × 1.757 mm WLCSP封裝.主要用在降噪手機和耳機,藍牙有源降噪(ANC)手機和耳機,PND,數字照相機和攝影機,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ADAU1850主要特性,功能框圖和模擬性能指標,以及評估板EVALADAU1850EBZ主要特性,框圖,電路圖和材料清單.
The ADAU1850 is a codec with three inputs and one output thatincorporates one digital signal processor. The path from the analoginput to the DSP core to the analog output is optimized for low latencyand is ideal for noise canceling earphones. With the additionof a few passive components, the ADAU1850 provides a completeheadset solution.
The ADAU1850 is provided in a small, 28-ball, 2.957 mm × 1.757mm wafer level chip scale package (WLCSP).
ADAU1850主要特性:
► Programmable FastDSP audio processing engine
► Up to 768 kHz sample rate
► Biquad filters, limiters, volume controls, mixing
► Low latency, 24-bit ADCs and DAC
► 106 dB SNR (signal through ADC with A-weighted filter)
► 110 dB combined SNR (signal through DAC and headphonewith A-weighted filter)
► Serial port sample rates from 8 kHz to 768 kHz
► 5 μs analog-to-analog group delay
► Programmable, double precision MAC engine for 13-stageequalizer
► 3 analog inputs (2 differential and 1 single-ended), configurableas microphone or line inputs
► Analog differential audio output, configurable as either line outputor headphone driver
► PLL supporting any input clock rate from 30 kHz to 27 MHz
► 1-channel ASRCI, 3-channel ASRCO
► Serial audio ports supporting I2S, left justified, or up to 16-channelTDM (TDM16)
► 2 interpolators and 4 decimators with flexible routing
► Power supplies
► Analog AVDD at 1.8 V
► Digital I/O IOVDD at 1.8 V to 3.3 V
► Headphone HPVDD at 1.8 V
► Headphone HPVDD_L at 1.2 V to1.8 V
► Control/communication interfaces
► I2C, SPI, or UART
► 28-ball, 0.4 mm pitch, 2.957 mm × 1.757 mm WLCSP
ADAU1850應用:
► Noise canceling handsets, headsets, and headphones
► Bluetooth active noise canceling (ANC) handsets, headsets, andheadphones
► Personal navigation devices
► Digital still and video cameras
► Musical instrument effect processors
► Multimedia speaker systems
► Smartphones
圖1.ADAU1850功能框圖
ADAU1850模擬性能指標:
評估板EVALADAU1850EBZ
Evaluating the ADAU1850 Three ADCs, One DAC, Low Power Codec with Audio/Fast DSP
This user guide explains the design and setup of the EVALADAU1850EBZevaluation board.
This evaluation board provides access to all analog and digitalinputs/outputs on the ADAU1850. The ADAU1850 core is controlledby Analog Devices, Inc., Lark Studio™ software, which interfacesto the EVAL-ADAU1850EBZ via a USB connection. The softwaredevelopment kit (SDK) is also provided by Analog Devices for codedevelopment.
The EVAL-ADAU1850EBZ can be powered by the USB bus or bya single 3.8 V to 5 V supply. These supply options are regulatedto the voltages required on the EVAL-ADAU1850EBZ. The printedcircuit board (PCB) is a 4-layer design, with a ground plane anda power plane on the inner layers. The EVAL-ADAU1850EBZcontains connectors for external microphones and speakers. Themaster clock can be provided externally or by the on-board 24.576MHz oscillator.
評估板EVALADAU1850EBZ包括:
► EVAL-ADAU1850EBZ evaluation board
► USB cable with mini USB plug
評估板EVALADAU1850EBZ需要文件:
► ADAU1850 data sheet
► EVAL-ADAU1850EBZ user guide
圖2.評估板EVALADAU1850EBZ外形圖
圖3.評估板EVALADAU1850EBZ框圖
圖4.評估板EVALADAU1850EBZ電路圖
評估板EVALADAU1850EBZ材料清單:
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