3D

OBSOLETE

LM4546

www.ti.com

SNOS440D – FEBRUARY 1999 – REVISED APRIL 2013

LM4546 AC '97 Rev 2 Codec with Sample Rate Conversion and TI 3D Sound

Check for Samples: LM4546

1

FEATURES

DESCRIPTION

The LM4546 is an audio codec for PC systems which

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•

AC'97 Rev 2 Compliant

is fully PC98 compliant and performs the analog

•

TI's 3D Sound Circuitry

intensive functions of the AC97 Rev 2 architecture.

•

High Quality Sample Rate Conversion (SRC)

Using 18-bit Sigma-Delta A/D's and D/A's, the

from 4kHz to 48kHz in 1Hz Increments

LM4546 provides 90dB of Dynamic Range.

•

Multiple Codec Support

The LM4546 was designed specifically to provide a

high quality audio path and provide all analog

•

Advanced Power Management Support

functionality in a PC audio system. It features full

•

Digital 3V and 5V Compliant

duplex stereo A/D's and D/A's and an analog mixer

with 2 stereo and 3 mono inputs, each of which has

APPLICATIONS

separate gain, attenuation and mute control. The

•

Desktop PC Audio Systems

LM4546

also

provides

TI's

3D

Sound

stereo

enhancement.

•

Portable PC Systems

The

LM4546

supports

variable

sample

rate

•

Mobile PC Systems

conversion

as

defined

in

the

AC97

Rev2

specification. The sample rate for the A/D and D/A

KEY SPECIFICATIONS

can be programmed separately to convert any rate

•

Analog Mixer Dynamic Range: 97 dB (Typ)

between 4kHz - 48kHz with a resolution of 1Hz. The

AC97 architecture separates the analog and digital

•

D/A Dynamic Range: 89 dB (Typ)

functions of the PC audio system allowing both for

•

A/D Dynamic Range: 90 dB (Typ)

system design flexibility and increased performance.

Block Diagram

Figure 1. LM4546 Block Diagram

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.