PC98-Compliant Audio Codec Provides 90-dB Dynamic Range

Designed for the general PC market, the LM4549 audio codec is fully PC98 compliant and performs the analog-intensive functions of the AC97 Rev2.1 architecture. Using 18-bit sigma-delta A/Ds and D/As, the chip provides 90 dB of dynamic range. It's designed specifically to provide a high-quality audio path, as well as all analog functionality in a PC audio system. It features full-duplex stereo A/Ds and D/As and an analog mixer with four stereo and three mono inputs, each of which has separate gain, attenuation and mute control. For increased battery life in portable devices, the chip operates at a digital voltage range of 3V to 5V and an analog voltage of 4.2V to 5.0V. It also features a multiple coded option and analog 3D for maximum audio performance. The chip is housed in a 48-pin TQFP.