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LM4550 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4550 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 25 page  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 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 kHz–48 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. Key Specifications n Analog Mixer Dynamic Range 97dB (typ) n D/A Dynamic Range 89dB (typ) n A/D Dynamic Range 90dB (typ) n Headphone Amp THD+N at 50 mW 0.02% (typ) into 32 Ω 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 function allows multiple codecs to be connected serially and use only a single controller SDATA_IN pin n High quality Sample Rate Conversion (SRC) from 4 kHz to 48 kHz in 1 Hz increments. n Stereo headphone amp with separate gain control n National’s 3D Sound circuitry n External Amplifier Power Down (EAPD) control from codec n PC-Beep passthrough to Line Out while reset is held active low n Digital 3.3V and 5V compliant Applications n Desktop PC audio systems on PCI cards, AMR cards, or with motherboard chips sets featuring AC-Link n Portable PC systems as on MDC cards, or with a chipset or accelerator featuring AC-Link n 2, 4, or 6 channel systems December 2002 © 2002 National Semiconductor Corporation DS100972 www.national.com |
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