LM4549A Datasheet 2 Multi-Channel Audio Codec

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: LM4549A AC ’97 Rev 2.1 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound May 2004 LM4549A AC ’97 Rev 2.

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LM4549A 2 multi-channel audio codec by National Semiconductor (now Texas Instruments) - Datasheet Preview

Datasheet Details

Part number	LM4549A
Manufacturer	National Semiconductor (now Texas Instruments)
File Size	498.52 KB
Description	2 Multi-Channel Audio Codec
Download	LM4549A Download (PDF)

General Description

The LM4549A is an audio codec for PC systems which is fully PC99 compliant and performs the analog intensive functions of the AC ’97 Rev 2.1 architecture.

Using 18-bit Sigma-Delta ADCs and DACs, the LM4549A provides 90 dB of Dynamic Range.

The LM4549A 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 ADCs and DACs and analog mixers with access to 4 stereo and 4 mono inputs. Each mixer input has separate gain, attenuation and mute control and the mixers drive 1 mono and 2 stereo outputs, each with attenuation and mute control. The LM4549A supports National’s 3D Sound stereo enhancement and a comprehensive sample rate conversion capability. The sample rate for the ADCs and DACs can be programmed separately with a resolution of 1 Hz to convert any rate in the range 4 kHz.

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