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LM4550B Datasheet PDF - National ->Texas Instruments

Part NameDescriptionManufacturer
LM4550B AC ’97 Rev 2.1 Multi-Channel Audio Codec with Stereo Headphone Amplifier, Sample Rate Conversion and National 3D Sound National-Semiconductor
National ->Texas Instruments National-Semiconductor
Other PDF  no available.
LM4550B Datasheet PDF : LM4550B pdf   
LM4550B image

General Description
The LM4550B 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 LM4550B provides 90 dB of Dynamic Range.

Key Specifications
■ Analog Mixer Dynamic Range 97 dB (typ)
■ DAC Dynamic Range 89 dB (typ)
■ ADC Dynamic Range 90 dB (typ)
■ Headphone Amp THD+N at 50 mW 0.02% (typ)
   into 32Ω

Features
■ AC ’97 Rev 2.1 compliant
■ High quality Sample Rate Conversion from 4 kHz to 48 kHz in 1 Hz increments
■ Supports up to 6 DAC channel systems with multiple
   LM4550Bs or with other National LM45xx codecs
■ Unique National chaining function shares a single controller
   SDATA_IN pin among multiple codecs
■ Stereo headphone amp with separate gain control
■ National’s 3D Sound stereo enhancement circuitry
■ Advanced power management support
■ External Amplifier Power Down (EAPD) control
■ PC Beep passthrough to Line Out during Initialization or Cold Reset
■ Digital 3.3V and 5V supply options
■ Extended Temperature: −40˚C ≤ TA ≤ 85˚C

Applications
■ Desktop PC audio systems on PCI cards, AMR cards, or with motherboard chips sets
   featuring AC Link
■ Portable PC systems as on MDC cards, or with a chipset or accelerator featuring AC Link
■ General Audio Frequency Systems requiring 2, 4 or 6 DAC
   channels and/or up to 8 ADC channels
■ Automotive telematics

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