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