AKM AK4954A低功耗32位CODEC解决方案

AKM公司的AK4954A是集成了麦克风,耳机放大器和扬声器放大器的低功耗32位CODEC,输入电路包括麦克风放大器和自动电平控制(ALC)电路,输出电路包括无电容的耳机放大器和扬声器放大器,非常适合于手提音频应用.本文介绍了AK4954A 主要特性,框图,以及评估板AK4954A方框图和电路图.

The AK4954A is a low power consumption 32-bit stereo CODEC with a microphone, a headphone and a speaker amplifiers. The input circuits include a microphone amplifier and an ALC (Automatic Level Control) circuit, and the output circuits include a cap-less headphone amplifier and a speaker amplifier. It is suitable for portable application with recording/playback function. The integrated charge pump circuit generates a negative voltage and removes the output AC coupling capacitors. The speaker amplifier has a wide operating voltage range, which is from 0.9V to 5.5V, enabling a direct drive to batteries. The AK4954A is available in a small 32-pin QFN (4x4mm 0.4mm pitch), utilizing less board space than competitive offerings.

AK4954A 主要特性:

1. Recording Function
• Two Low Noise Microphone Power Supplies
• Stereo Single-ended input with three Selectors
• Low Noise Microphone Amplifier (+26dB/+20dB/+13dB/+6dB/0dB)
• Digital ALC (Automatic Level Control)..

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