ADAU1781具有哪些特性参数应用？

　　ADI公司的ADAU1781是低功耗24位立体声编译码器，可编程的SigmaDSP音频处理核，低噪音DAC和ADC支持取样速率从8kHz到96kHz，扬声器能向8欧姆负载输出400mW，模拟和数字I/O电压1.8 V- 3.3 V，主要用在数码相机和数码摄像机。本文介绍了ADAU1781主要特性，方框图以及差分输入系统，模拟麦克风输入系统， 单端立体声线输入框图和立体声数字麦克风输入系统的框图，评估板EVAL-ADAU1781Z主要特性，框图，电路图，材料清单和PCB元件布局图。
　　The ADAU1781 is a low power， 24-bit stereo audio codec. The low noise DAC and ADC support sample rates from 8 kHz to 96 kHz. Low current draw and power saving modes make the ADAU1781 ideal for battery-powered audio applications.
　　A programmable SigmaDSP® core provides enhanced record and playback processing to improve overall audio quality.
　　The record path includes two digital stereo microphone inputs and an analog stereo input path. The analog inputs can be configured for either a pseudo differential or a single-ended stereo source. A dedicated analog beep input signal can be mixed into any output path. The ADAU1781 includes a stereo line output and speaker driver， which makes the device capable of supporting dynamic speakers.
　　The serial control bus supports the I2C® or SPI protocols， and the serial audio bus is programmable for I2S， left-justified， right-justified， or TDM mode. A programmable PLL supports flexible clock generation for all standard rates and available master clocks from 11 MHz to 20 MHz
　　ADAU1781主要特性：
　　24-bit stereo audio ADC and DAC
　　400 mW speaker amplifier （into 8 Ω load）
　　Programmable SigmaDSP audio processing core
　　Wind noise detection and filtering
　　Enhanced stereo capture （ESC）
　　Dynamics processing
　　Equalization and filtering
　　Volume control and mute
　　Sampling rates from 8 kHz to 96 kHz
　　Stereo pseudo differential microphone input
　　Optional stereo digital microphone input pulse-density modulation （PDM）
　　Stereo line output
　　PLL supporting a range of input clock rates
　　Analog and digital I/O 1.8 V to 3.3 V
　　Software control via SigmaStudio graphical user interface
　　Software-controllable， clickless mute
　　Software register and hardware pin standby mode
　　32-lead， 5 mm × 5 mm LFCSP
　　ADAU1781应用：
　　Digital still cameras
　　Digital video cameras
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　　图1. ADAU1781框图
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　　图2. ADAU1781差分输入系统框图
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　　图3. ADAU1781模拟麦克风输入系统框图
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　　图4. ADAU1781单端立体声线输入系统框图
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　　图5. ADAU1781立体声数字麦克风输入系统框图
　　ADAU1781 SigmaDSP评估板EVAL-ADAU1781Z
　　This user guide explains the design and setup of the ADAU1781 SigmaDSP® evaluation board.
　　This evaluation board provides full access to all analog and digital I/Os on the ADAU1781. The SigmaDSP is controlled by Analog Devices， Inc.， SigmaStudio™ software， which interfaces to the board via a USB connection. This evaluation board can be powered either over the USB bus or by a single 3.8 V to 6 V supply， which is regulated to the voltages required on the board. The PC board is a 4-layer design， with a single ground plane and a single power plane on the inner layers. The board contains on-board microphones and speaker， and connectors for external microphones and speaker. The master clock can be provided externally or by the on-board 12.288 MHz active oscillator.
　　EVAL-ADAU1781Z评估包包括：
　　ADAU1781 evaluation board
　　EVAL-ADUSB2EBZ （USBi） communications adapter
　　USB cable with Mini-B plug
　　Evaluation board/software quick-start guide
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　　图6.评估板EVAL-ADAU1781Z外形图
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　　图7.评估板EVAL-ADAU1781Z功能框图
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　　图8.评估板EVAL-ADAU1781Z电路图： SigmaDSP，模拟I/O和主时钟发生
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　　图9.评估板EVAL-ADAU1781Z电路图：数字麦克风接口
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　　图10.评估板EVAL-ADAU1781Z电路图：串行音频数据接口
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　　图11.评估板EVAL-ADAU1781Z电路图：电源
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　　图12.评估板EVAL-ADAU1781Z电路图：GPIO
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　　图13.评估板EVAL-ADAU1781Z电路图：通信接口
　　评估板EVAL-ADAU1781Z材料清单：
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　　图14.评估板EVAL-ADAU1781Z PCB元件布局图
　　详情请见：
　　ADAU1781［2］.pdf（1014.96 KB）2012-5-3 13:48 上传
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　　和
　　UG-177［2］.pdf（1.19 MB）2012-5-3 13:50 上传
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