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１概述 ＬＭ４５４９是用于ＰＣ系统的音频编解码器，它完全适合ＰＣ９８系统，能够实现ＡＣ９７ ２．１版的模拟加强功能。 ＬＭ４５４９使用了 １８位 ∑△ Ａ／Ｄ和 Ｄ／Ａ转换电路，动态范围９０ｄＢ。 ＬＭ４５４９是专门为满足高质量音频通道和ＰＣ机音频系统的所有模拟
1 General Description The LM4549 is an audio codec for PC systems that is fully compatible with the PC98 system and enables analog enhancement of AC97 version 2.1. The LM4549 uses 18-bit ΣΔ A / D and D / A conversion circuitry with a dynamic range of 90dB. The LM4549 is designed to meet all the analogue of high quality audio channels and PC audio systems