LM4543 - National Semiconductor

LM4543 AC97 Codec

The LM4543 is an audio codec for PC systems which performs the analog-intensive function of the Analog Codec ’97 Rev 1.03 architecture. Using 18-Bit Σ∆ A/D and D/A converters, the LM4543 provides 90dB of dynamic range. The LM4543 was designed specifically to provide a high quality audio path and provide all analog functionality in a PC audio system. It featu.

Features

full duplex stereo A/D’s and D/A’s and an analog mixer with 4 stereo and 3 mono inputs, each of which has separate gain, attenuation and mute control. In addition, the LM4543 provides National’s 3D Sound stereo enhancement technology. The LM4543 features AC-Link, a synchronous, fixed rate serial bus for connection to the digital AC ’97 Controller. The separation of the analog and digital functions of the AC ’97 architecture allows for system design flexibility and increased overall performance. Key Specifications n Analog Mixer Dynamic Range n D/A Dynamic Range n A/D Dynamic Range 95dB (typ) .