Lm3485 Led Demo Board


Posted on Feb 6, 2014

The LM4550 is an Audio CODEC for PC systems which is fully PC99 compliant and performs the Analog intensive functions of the AC97 Rev2. 1 architecture. Using 18-bit Sigma-Delta A/Ds and D/As, the LM4550 provides 90 dB of Dynamic Range. The LM4550 was designed specifically to provide a high quality Audio path and provide all Analog functionality in


Lm3485 Led Demo Board
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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. The LM4550 provides a stereo Headphone Amplifier with an independent gain control and also supports Nationals 3D Sound stereo enhancement and variable sample rate con- version. The sample rate for the A/D and D/A CAN be pro- grammed separately with a resolution of 1 Hz to convert any rate between 4 kHz48 kHz. The LM4550 features the ability to connect several codecs together in a system to provide up to six channels for sur- round sound applications. Multiple codec systems CAN be built using the standard AC-Link format of one serial data stream per codec, or using a unique National Semiconductor feature for chaining codecs together. This chain feature re- quires only a single data stream to the controller. The AC97 architecture separates the Analog and digital func- tions of the PC Audio system allowing both for system design flexibility and increased performance. By National Semiconductor Corporation




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