LM4549A

更新时间： 2024-09-27 04:20:07

品牌	Logo	应用领域
美国国家半导体 - NSC		解码器编解码器
页数	文件大小	规格书
28页	525K
描述
AC ’97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound

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数据手册

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LM4549A 数据手册

May 2004

LM4549A

AC ’97 Rev 2.1 Multi-Channel Audio Codec with Sample

Rate Conversion and National 3D Sound

General Description

Key Specifications

n Analog Mixer Dynamic Range

n DAC Dynamic Range

97 dB (typ)

89 dB (typ)

90 dB (typ)

The LM4549A 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 LM4549A provides 90 dB

of Dynamic Range.

n ADC Dynamic Range

Features

The LM4549A 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 4 stereo and 4 mono

inputs. Each mixer input has separate gain, attenuation and

mute control and the mixers drive 1 mono and 2 stereo

outputs, each with attenuation and mute control. The

LM4549A supports National’s 3D Sound stereo enhance-

ment and a comprehensive sample rate conversion capabil-

ity. The sample rate for the ADCs and DACs can be pro-

grammed 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 com-

pletely deterministic to ease task scheduling and application

software development. These features together with an ex-

tended temperature range also make the LM4549A suitable

for non-PC codec applications.

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 True Line Level Output with separate gain control

n National’s 3D Sound stereo enhancement circuitry

n Advanced power management support

n External Amplifier Power Down (EAPD) control

n PC-Beep passthrough to Line Out during Initialization or

Cold Reset

n Digital 3.3V and 5V supply options

n Extended Temperature: −40˚C ≤ T_A≤ 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

The LM4549A 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.

LM4549A 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 LM4549A may also be used in systems

with the National LM4550 to support up to 6 simultaneous

channels of streaming data on Output Frames.

n General and Multi-channel audio frequency systems

The AC ’97 architecture separates the analog and digital

functions of the PC audio system allowing both for system

design flexibility and increased performance.

DS200299

www.national.com

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与LM4549A相关器件

型号	品牌	获取价格	描述	数据表
LM4549AVH	NSC	获取价格	AC ’97 Rev 2.1 Codec with Sample Rate Convers
LM4549AVHX	TI	获取价格	IC,SOUNDCARD CIRCUITS,QFP,48PIN,PLASTIC
LM4549AVHX/NOPB	TI	获取价格	IC,SOUNDCARD CIRCUITS,QFP,48PIN,PLASTIC
LM4549B	NSC	获取价格	AC ’97 Rev 2.1 Multi-Channel Audio Codec with
LM4549B	TI	获取价格	AC '97 编解码器（2.1 版），具有采样率转换和 National 3D Sound
LM4549BVH	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48, Consumer IC:Othe
LM4549BVH	TI	获取价格	SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48
LM4549BVH/NOPB	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48, Consumer IC:Othe
LM4549BVH/NOPB	TI	获取价格	AC '97 编解码器（2.1 版），具有采样率转换和 National 3D Sound
LM4549BVHX	TI	获取价格	SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48

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