LM4540 AC97 Codec

National Semiconductor

Description

LM4540 AC ’97 Codec with National 3D Sound February 1999 LM4540 AC ’97 Codec with National 3D Sound General .
The LM4540 is an audio codec for PC systems which performs the analog-intensive function of the Analog Codec ’97 Rev 1.

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Datasheet Specifications

Part number: LM4540
Manufacturer: National Semiconductor
File Size: 298.51 KB
Datasheet: LM4540_NationalSemiconductor.pdf
Description: AC97 Codec

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

Applications

* n PC Audio Systems Requiring Only 2 Stereo Inputs (CD, Line) and 3 Mono Inputs (Mic, Phone, PC Beep) Block Diagram DS100906-1 FIGURE 1. LM4540 Block Diagram © 1999 National Semiconductor Corporation DS100906 www. national. com Absolute Maximum Ratings (Note 3) If Military/Aerospace specified de

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LM4540 AC97 Codec National Semiconductor

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