DatasheetsPDF.com

LM4546B Dataheets PDF



Part Number LM4546B
Manufacturers National Semiconductor
Logo National Semiconductor
Description AC 97 Rev 2 Multi-Channel Audio Codec
Datasheet LM4546B DatasheetLM4546B Datasheet (PDF)

LM4546B AC ’97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound September 2006 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 spec.

  LM4546B   LM4546B


Document
LM4546B AC ’97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound September 2006 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 enhancement and a comprehensive sample rate conversion capability. The sample rate for the ADCs and DACs can be programmed 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 completely deterministic to ease task scheduling and application software development. These features together with an extended 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 n DAC Dynamic Range n ADC Dynamic Range 97 dB (typ) 89 dB (typ) 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 ≤ TA ≤ 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 © 2006 National Semiconductor Corporation DS201233 www.national.com www.DataSheet.in LM4546B www.national.com Block Diagram 2 www.DataSheet.in 20123301 LM4546B Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage ESD Susceptibility (Note 2) pin 3 ESD Susceptibility (Note 3) pin 3 Junction Temperature 6.0V −65˚C to +150˚C −0.3V to VDD +0.3V 2000V 750V 200V 100V 150˚C Soldering Information LQFP Package Vapor Phase (60 sec.) Infrared (15 sec.) θJA (typ) – VBH48A 215˚C 220˚C 74˚C/W Operating Ratings Temperature Range TMIN ≤ TA ≤ TMAX (Note 4) Analog Supply Range Digital Supply Range −40˚C ≤ TA ≤ 85˚C 4.2V ≤ AVDD ≤ 5.5V 3.0V ≤ DVDD ≤ 5.5V Electrical Characteristics (Notes 1, 5) The following specifications apply for AVDD = 5V, DVDD = 3.3V, Sampling Frequency (Fs) = 48 kHz, single codec configuration, (primary mode) unless otherwise noted. Limits apply for TA= 25˚C. The reference for 0 dB is 1 Vrms unless otherwise specified. Symbol Parameter Conditions LM4546B Typical (Note 6) AVDD DVDD Analog Supply Range Digital Supply Range Digital Quiescent Power Supply Current Analog Quiescent Power Supply Current Digital Shutdown Current Analog Shutdown Current Reference Voltage Power Supply Rejection Ratio CD Input to Line Output, -60 dB Input THD+N VO = -3 dB, f = 1 kHz, RL = 10 kΩ LINE_IN, AUX, CD, VIDEO, PC_BEEP, PHONE PR543210 = 111111 PR543210 = 111111 No pullup resistor DVDD = 5 V DVDD = 3.3 V 34 19 53 19 70 2.16 40 Limit (Note 7) 4.2 5.5 3.0 5.5 DIDD AIDD IDSD IASD VREF PSRR V (min) V (max) V (min) V (max) mA mA mA µA µA V dB Units (Limits) Analog Loopthrough Mode (Note 8) Dynamic Range (Note 9) THD Total Harmonic Distortion 97 0.013 90 0.02 dB (min) % (max) Analog Input Section VIN VIN VIN Xtalk ZIN CIN Line Input Voltage Mic Input with 20 dB Gain Mic Input with 0 dB Gain Crosstalk Input Impedance (Note 9) Input Capacitance(Note 9) Interchannel Gain Mismatch Record Gain Amplifier - ADC AS AM Mixer Section AS AM Step Size Mute Attenuation +12 dB to -34.5 dB 1.5 86 dB dB Step Size Mute Att.


LM3218 LM4546B LM4549B


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