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LM4549 Datasheet AC97 Codec

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: LM4549 AC ’97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound February 1999 LM4549 AC ’97 Rev 2.

General Description

The LM4549 is an audio codec for PC systems which is fully PC98 compliant and performs the analog intensive functions of the AC97 Rev2.1 architecture.

Using 18-bit Sigma-Delta A/D’s and D/A’s, the LM4549 provides 90dB of Dynamic Range.

The LM4549 was designed specifically to provide a high quality audio path and provide all analog functionality in a PC audio system.

Key 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 codec features a second Line Output known as True Line Level Out that is identical to Line Out but with independent volume control. The LM4549 also features National’s 3D Sound stereo enhancement and variable sample rate conversion. The sample rate for the A/D and D/A can be programmed separately with a resolution of 1Hz to convert any rate be.

Similar Datasheet

Brand Logo Part Number Description Manufacturer
Texas Instruments Logo LM4549B Multi-Channel Audio Codec Texas Instruments

More Datasheets from National Semiconductor (now Texas Instruments)

Part Number Description
LM4549A 2 Multi-Channel Audio Codec
LM4549B AC 97 Rev 2.1 Multi-Channel Audio Codec
LM4540 AC97 Codec
LM4543 AC97 Codec
LM4545 AC97 Codec
LM4546 AC97 Codec
LM4546A 2 Multi-Channel Audio Codec
LM4546B AC 97 Rev 2 Multi-Channel Audio Codec
LM4548 AC97 Codec
LM4548A 2 Multi-Channel Audio Codec

LM4549 Distributor