RoHS Compliance Information	Size in Kbytes	Date
LM4548 AC '97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound	328 Kbytes	29-Sep-00	Download

Obsolete Versions

General Description

The LM4548 is an audio codec for PC systems which is fully PC98 compliant and performs the analog intensive functions of the AC97 Rev2 architecture. Using 18-bit Sigma-Delta A/D's and D/A's, the LM4548 provides 90dB of Dynamic Range.

The LM4548 was designed specifically to provide a high quality audio path and provide all analog functionality in a PC audio system. It 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. The LM4548 also provides the additional True Line-Level output and National's 3D Sound stereo enhancement.

The LM4548 supports variable sample rate conversion as defined in the AC97 Rev2 specification. The sample rate for the A/D and D/A can be programmed separately to convert any rate between 4kHz - 48kHz with a resolution of 1Hz. The AC97 architecture separates the analog and digital functions of the PC audio system allowing both for system design flexibility and increased performance.

More Application Notes

Title	Size in Kbytes	Date
AN-1528: Application Note 1528 Using AC'97 Codecs in Non-PC Systems	164 Kbytes	16-Mar-07	Download
AN-1528 (Chinese): Application Note 1528 Using AC'97 Codecs in Non-PC Systems	483 Kbytes