LM4546AVH NSC [National Semiconductor], LM4546AVH Datasheet

LM4546AVH

Manufacturer Part Number

LM4546AVH

Description

AC 97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound

Manufacturer

NSC [National Semiconductor]

Datasheet

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AC '97 Rev 2 Multi-Channel Audio Codec with Sample Rate

Conversion and National 3D Sound

General Description

The LM4546A is an audio codec for PC systems which is fully

PC98 compliant and performs the analog intensive functions

of the AC '97 Rev 2 architecture. Using 18-bit Sigma-Delta

ADCs and DACs, the LM4546A provides 90 dB of Dynamic

Range.

The LM4546A 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 LM4546A supports

National's 3D Sound stereo enhancement and a comprehen-

sive 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 fea-

tures together with an extended temperature range also make

the LM4546A suitable for non-PC codec applications.

The LM4546A 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.

LM4546A 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 mul-

tiple codecs. The LM4546A may also be used in systems with

the National LM4550 to support up to 6 simultaneous chan-

nels 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.

200308 Version 5 Revision 1

200308

LM4546A

Print Date/Time: 2009/07/15 15:26:52

Key Specifications

■

Features

■

Applications

■

Analog Mixer Dynamic Range

DAC Dynamic Range

ADC Dynamic Range

AC '97 Rev 2 compliant

High quality Sample Rate Conversion from 4 kHz to 48

kHz in 1 Hz increments

Multiple codec support

National's 3D Sound stereo enhancement circuitry

Advanced power management support

Digital 3.3V and 5V supply options

Extended Temperature: −40°C

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 and Multi-channel audio frequency systems

≤

85°C

OBSOLETE

www.national.com

July 15, 2009

97 dB (typ)

89 dB (typ)

90 dB (typ)

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