Ac’97 Codec With Stereo Headphone Amplifier And National 3d Sound - National SemiconductorThe LM4545 is an Audio CODEC for PC systems which per-
forms the analog-intensive function of the Analog Codec 97
Rev 1.03 Architecture. Using 18-Bit A/D and D/A convert-
ers, the LM4545 provides 90dB of dynamic range.
The LM4545 was designed specifically to provide a high
quality Audio path and provide all Analog functionality in a PC
Audio system. It features full duplex stereo A/Ds and D/As
and an Analog mixer with 4 stereo and 3 mono inputs, each
of which has separate gain, attenuation and mute control. In
addition, the LM4545 provides a stereo Headphone Amplifier
with an independent gain control and Nationals 3D Sound
stereo enhancement technology.
The LM4545 features AC-Link, a synchronous, fixed rate se-
rial 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 in-
creased overall performance. By National Semiconductor Corporation
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