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LM4546B Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4546B Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 27 page  LM4546B AC ’97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound General Description The LM4546B 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 LM4546B provides 90 dB of Dynamic Range. The LM4546B 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 2 stereo and 2 mono inputs. Each mixer input has separate gain, attenuation and mute control and the mixers drive 1 mono and 1 stereo output, each with attenuation and mute control. The LM4546B 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 LM4546B suitable for non-PC codec applications. The LM4546B 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. LM4546B 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 LM4546B may also be used in systems with the National LM4550 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 National’s 3D Sound stereo enhancement circuitry n Advanced power management support 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 DS201233 www.national.com |
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