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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LM4549B 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM4549B 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
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1 / 28 page  LM4549B AC ’97 Rev 2.1 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound General Description The LM4549B is an audio codec for PC systems which is fully PC99 compliant and performs the analog intensive functions of the AC ’97 Rev 2.1 architecture. Using 18-bit Sigma-Delta ADCs and DACs, the LM4549B provides 90 dB of Dynamic Range. The LM4549B 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 ADCs and DACs and analog mixers with access to 4 stereo and 4 mono inputs. Each mixer input has separate gain, attenuation and mute control and the mixers drive 1 mono and 2 stereo outputs, each with attenuation and mute control. The LM4549B supports National’s 3D Sound stereo enhance- ment and a comprehensive sample rate conversion capabil- ity. The sample rate for the ADCs and DACs can be pro- grammed separately with a resolution of 1 Hz to convert any rate in the range 4 kHz – 48 kHz. Sample timing from the ADCs and sample request timing for the DACs are com- pletely deterministic to ease task scheduling and application software development. These features together with an ex- tended temperature range also make the LM4549B suitable for non-PC codec applications. The LM4549B features the ability to connect several codecs together using the Extended AC Link configuration of one dedicated serial data signal to the Controller per codec. LM4549B systems support up to 8 simultaneous channels of streaming data on Input Frames (Codec to Controller) while Output Frames (Controller to Codec) carry 2 streams to multiple codecs. The LM4549B may also be used in systems with the National LM4550B to support up to 6 simultaneous channels of streaming data on Output Frames. The AC ’97 architecture separates the analog and digital functions of the PC audio system allowing both for system design flexibility and increased performance. Key Specifications n Analog Mixer Dynamic Range 97 dB (typ) n DAC Dynamic Range 89 dB (typ) n ADC Dynamic Range 90 dB (typ) Features n AC ’97 Rev 2.1 compliant n High quality Sample Rate Conversion from 4 kHz to 48 kHz in 1 Hz increments n Multiple codec support n True Line Level Output with separate gain control n National’s 3D Sound stereo enhancement circuitry n Advanced power management support n External Amplifier Power Down (EAPD) control n PC-Beep passthrough to Line Out during Initialization or Cold Reset n Digital 3.3V and 5V supply options n Extended Temperature: −40˚C ≤ T A ≤ 85˚C 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 General and Multi-channel audio frequency systems n Automotive Telematics September 2006 © 2006 National Semiconductor Corporation DS201235 www.national.com |
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