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ADIADAU1781低噪音立體聲CODEC方案  2012/3/1

         ADI公司的 ADAU1781是低功耗低噪音24位立體聲CODEC,低噪音DAC和ADC支持樣速率從8kHz到96kHz.具有能向8歐姆負(fù)載提供400mW的揚(yáng)聲器放大器,可編程SigmaDSP音頻處理器核.模擬喝數(shù)字的工作電壓為1.8V-3.3V.主要用在數(shù)碼相機(jī)和數(shù)碼攝影機(jī).本文介紹ADAU1781主要特性,方框圖以及多種系統(tǒng)應(yīng)用電路圖,包括差分輸入, 模擬麥克風(fēng)輸入, 單端立體聲線輸入和立體聲數(shù)字麥克風(fēng)輸入的系統(tǒng)方框圖.

The ADAU1781 is a lowpower, 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)

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