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LM4540 Datasheet AC97 Codec

Manufacturer: National Semiconductor (now Texas Instruments)

Overview: LM4540 AC ’97 Codec with National 3D Sound February 1999 LM4540 AC ’97 Codec with National 3D.

General Description

The LM4540 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 LM4540 provides 90dB of dynamic range.

The LM4540 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 2 stereo and 3 mono inputs, each of which has separate gain, attenuation and mute control. In addition, the LM4540 provides National’s 3D Sound stereo enhancement technology. The LM4540 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.

More Datasheets from National Semiconductor (now Texas Instruments)

Part Number Description
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 AC97 Codec
LM4549A 2 Multi-Channel Audio Codec
LM4549B AC 97 Rev 2.1 Multi-Channel Audio Codec

LM4540 Distributor