ADAU1781是一款低功耗、24位立体声音频编解码器。低噪声DAC和ADC支持8 kHz至96 kHz的采样速率。ADAU1781的低电流消耗和省电模式使其成为电池供电音频应用的理想之选。

可编程SigmaDSP内核提供增强的录音和回放处理功能，可提高总体音频质量。

录音路径包括两个数字立体声麦克风输入和一个模拟立体声输入路径。模拟输入可配置为伪差分或单端立体声源。专用模拟传呼输入信号可混入任何输出路径。ADAU1781内置立体声线路输出和扬声器驱动器，使该器件能够支持动态扬声器。

串行控制总线支持I2C® 或SPI协议，串行音频总线可编程为I2S、左对齐、右对齐或TDM模式。通过可编程PLL可灵活产生所有标准时钟频率以及从11 MHz到20 MHz的主时钟频率。

应用

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 onboard 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.

ADI公司的USBi “USB Interface” (EVAL-ADUSB2EBZ)接口板可用于连接PC的USB端口和SigmaDSP硬件的数据输入引脚。该接口可用于任意评估板，包括外部SPI/I2C连接头(Aardvark Header)。EVAL-ADUSB2EBZ板支持SPI和I2C通信（用户可选），可采用3.3V或1.8V作为IOVDD电源。USBi接口采用电脑USB端口供电。