DatasheetsPDF.com

LM4550

National Semiconductor
Part Number LM4550
Manufacturer National Semiconductor
Description AC97 Multi-Channel Audio Codec
Published Mar 22, 2005
Detailed Description LM4550 AC ’97 Rev 2.1 Multi-Channel Audio Codec with Stereo Headphone Amplifier, Sample Rate Conversion and National 3D ...
Datasheet PDF File LM4550 PDF File

LM4550
LM4550

Overview
LM4550 AC ’97 Rev 2.
1 Multi-Channel Audio Codec with Stereo Headphone Amplifier, Sample Rate Conversion and National 3D Sound December 2002 LM4550 AC ’97 Rev 2.
1 Multi-Channel Audio Codec with Stereo Headphone Amplifier, Sample Rate Conversion and National 3D Sound General Description 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/D’s and D/A’s, 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 a PC audio system.
It features full duplex stereo A/D’s and D/A’s 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 National’s 3D Sound stereo enhancement and variable sample rate conversion.
The sample rate for the A/D and D/A can be programmed separately with a resolution of 1 Hz to convert any rate between 4 kHz–48 kHz.
The LM4550 features the ability to connect several codecs together in a system to provide up to six channels for surround 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 requires only a single data stream to the controller.
The AC97 architecture separates the analog and digital functions of the PC audio system allowing both for system design flexibility and increased performance.
Key Specifications n n n n Analog Mixer Dynamic Range D/A Dynamic Range A/D Dynamic Range Headphone Amp THD+N at 50 mW into 32Ω 97dB 89dB 90dB 0.
02% (typ) (typ) (typ) (typ) Features n AC’97 Rev 2.
1 compliant n Several LM4550s can be combined together for up to 6 channel operation n Unique National chaining ...


Similar Datasheet


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site. (Privacy Policy & Contact)