| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | LM4549 |  324Kb/18P | AC ??7 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound |
 National Semiconductor ... | LM4549A |  528Kb/28P | AC ??7 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound |
| LM4549AVH |  528Kb/28P | AC ??7 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound |
 National Semiconductor ... | LM4549B |  933Kb/28P | AC ??7 Rev 2.1 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound |
 National Semiconductor ... | LM4549VH |  324Kb/18P | AC ??7 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound |