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LM4546VHNSCN/a976avaiAC '97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound [Life-time buy]
LM4546VHXNSN/a260avaiAC '97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound [Life-time buy]


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LM4546VH-LM4546VHX
AC '97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound [Life-time buy]
LM4546 ’97 Rev 2 Codec with Sample Rate Conversion and
National 3D Sound
General Description

The LM4546isan audio codecforPC systems whichis fully
PC98 compliant and performsthe analog intensive functions the AC97 Rev2 architecture. Using 18-bit Sigma-Delta
A/D’s and D/A’s, the LM4546 provides 90dBof Dynamic
Range.
The LM4546 was designed specificallyto providea high
quality audio path and provideall analog functionalityinaPC
audio system.It featuresfull duplex stereo A/D’s and D/A’s
andan analog mixer with2 stereo and3 mono inputs, each which has separate gain, attenuation and mute control.
The LM4546 also provides National’s3D Sound stereo en-
hancement.
The LM4546 supports variable sample rate conversionas
definedin the AC97 Rev2 specification. The sample ratefor
the A/D and D/A canbe programmed separatelyto convert
any rate between 4kHz- 48kHz witha resolutionof 1Hz. The
AC97 architecture separatesthe analog and digital functionsthePC audio system allowing bothfor system design flex-
ibility and increased performance.
Key Specifications
Analog Mixer Dynamic Range 97dB (typ) D/A Dynamic Range 89dB (typ) A/D Dynamic Range 90dB (typ)
Features
AC’97 Rev2 compliant National’s3D Sound circuitry High quality Sample Rate Conversion (SRC) from 4kHz 48kHzin 1Hz increments Multiple Codec support Advanced power management support Digital3V and5V compliant
Applications
DesktopPC Audio Systems Portable PC Systems MobilePC Systems
Block Diagram

DS100985-1
FIGURE1. LM4546 Block Diagram

September 2000
LM4546
’97
Rev
Codec
with
Sample
Rate
Conversion
and
National
Sound
ic,good price


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