LM4546AVH ,AC '97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Soundfeatures full duplex stereoADCs and DACskHz in 1 Hz incrementsand analog mixers with access to 2 st ..
LM4546VH ,AC '97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound [Life-time buy]features full duplex stereo A/D’s and D/A’sn AC’97 Rev 2 compliantand an analog mixer with 2 stereo ..
LM4546VHX ,AC '97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound [Life-time buy]Block Diagram 2000 National Semiconductor Corporation DS100985 Absolute Maximum Ratings (Note 3) So ..
LM4548AVH ,AC '97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Soundfeatures full duplex stereoADCs and DACskHz in 1 Hz incrementsand analog mixers with access to 4 st ..
LM4548VH ,AC '97 Codec with Sample Rate Conversion and National 3D Sound [Life-time buy]Electrical Characteristics (Notes 1, 3)The following specifications apply for AV = 5V, DV = 5V, Fs ..
LM4548VHX ,AC '97 Codec with Sample Rate Conversion and National 3D Sound [Life-time buy]features full duplex stereo A/D’s and D/A’sn AC’97 Rev2 compliantand an analog mixer with 4 stereo ..
LP2952IMX ,Adjustable Micropower Low-Dropout Voltage RegulatorFeaturesn Output voltage adjusts from 1.23V to 29VThe LP2952 and LP2953 are micropower voltage regu ..
LP2952IMX/NOPB ,Adjustable Micropower Low-Dropout Voltage Regulator 16-SOIC -40 to 125features, and an improved• Reverse Battery-Input Protectionshutdown function.• 50-mA (Typical) Auto ..
LP2952IMX-3.3 ,Adjustable Micropower Low-Dropout Voltage RegulatorFeaturesn Output voltage adjusts from 1.23V to 29VThe LP2952 and LP2953 are micropower voltage regu ..
LP2952IN ,Adjustable Micropower Low-Dropout Voltage RegulatorFeaturesn Output voltage adjusts from 1.23V to 29VThe LP2952 and LP2953 are micropower voltage regu ..
LP2952IN-3.3 ,Adjustable Micropower Low-Dropout Voltage Regulatorfeatures, and an improved shutdown function.n 5V and 3.3V versions availableThe internal crowbar pu ..
LP2953 ,Adjustable Micropower Low-Dropout Voltage RegulatorFeaturesYOutput voltage adjusts from 1.23V to 29VThe LP2952 and LP2953 are micropower voltage regul ..
LM4546AVH
AC '97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound
LM4546A ’97 Rev 2 Multi-Channel Audio Codec with Sample
Rate Conversion and National 3D Sound
General DescriptionThe LM4546Aisan audio codecfor PC systems whichis
fully PC98 compliant and performs the analog intensive
functionsof the AC ’97 Rev2 architecture. Using 18-bit
Sigma-Delta ADCs and DACs,the LM4546A provides90dB Dynamic Range.
The LM4546A was designed specificallyto providea high
quality audio path and provideall analog functionalityinaPC
audio system.It featuresfull duplex stereo ADCs and DACs
and analog mixers with accessto2 stereo and2 mono
inputs. Each mixer input has separate gain, attenuation and
mute control and the mixers drive1 mono and1 stereo
output, each with attenuation and mute control. The
LM4546A supports National’s 3D Sound stereo enhance-
ment anda comprehensive sample rate conversion capabil-
ity. The sample ratefor the ADCs and DACs canbe pro-
grammed separately witha resolutionof1Hzto convert any
ratein the range4 kHz–48 kHz. Sample timing from the
ADCs and sample request timingfor the DACs are com-
pletely deterministicto ease task scheduling and application
software development. These features together withan ex-
tended temperature range also makethe LM4546A suitable
for non-PC codec applications.
The LM4546A featuresthe abilityto connect several codecs
together using the Extended AC Link configurationof one
dedicated serial data signalto the Controller per codec.
LM4546A systems supportupto8 simultaneous channelsof
streaming dataon Input Frames (Codecto Controller) while
Output Frames (Controllerto Codec) carry2 streamsto
multiple codecs. The LM4546A may alsobe usedin systems
with the National LM4550to supportupto6 simultaneous
channelsof streaming dataon Output Frames.
The AC ’97 architecture separates the analog and digital
functionsof thePC audio system allowing bothfor system
design flexibility and increased performance.
Key Specifications Analog Mixer Dynamic Range 97dB (typ) DAC Dynamic Range 89dB (typ) ADC Dynamic Range 90dB (typ)
Features AC’97 Rev2 compliant High quality Sample Rate Conversion from4 kHzto48
kHzin1Hz increments Multiple codec support National’s3D Sound stereo enhancement circuitry Advanced power management support Digital 3.3V and5V supply options Extended Temperature: −40˚C≤TA≤ 85˚C
Applications DesktopPC audio systemson PCI cards, AMR cards,or
with motherboard chips sets featuringAC Link Portable PC systemsason MDC cards,or witha
chipsetor accelerator featuringAC Link General and Multi-channel audio frequency systems
March 2005
LM4546A
’97
Rev
Multi-Channel
Audio
Codec
with
Sample
Rate
Conversion
and
Sound
