[原创] AKM AK4951 24位立体声CODEC解决方案

AKM公司的AK4951是集成了麦克风,耳机和扬声器放大器的低功耗24位立体声CODEC,取样频率从8kHz到48kHz,输入电路包括麦克风放大器,采用有所有权算法的自动噪音滤波器和高性能自动音量控制(ALC),输出电路包括无电容耳机放大器和输出一瓦的扬声器放大器.主要用在IP照相机,数码相机,IC录音机,平板电脑,无线耳机和手持设备.本文介绍了AK4951主要特性,框图以及评估板AKD4951EN-B主要特性,框图,电路,PCB元件布局图和走线图.

The AK4951 is a low power 24-bit stereo CODEC with a microphone, headphone and speaker amplifiers. The AK4951 supports sampling frequency from 8kHz to 48kHz. It is suitable for a wide range of application from speech signal processing for narrowband, wideband and super wideband to sound signal processing for audio band. The input circuits include a microphone amplifier, an automatic wind noise reduction filter of the proprietary algorithms and a high performance digital ALC (automatic level control) circuit, therefore the AK4951 can record with high-quality sound regardless of whether indoors or outdoors. In addition, the output circuits include a cap-less headphone amplifier with a negative voltage generated by charge pump circuit and a speaker amplifier with 1W output power. It is suitable for various products as well as portable applications with recording/playback function.
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