LM4549MDC

更新时间： 2024-11-11 13:09:23

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
18页	327K
描述
IC,SOUNDCARD CIRCUITS,DIE

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技术参数
数据手册

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LM4549MDC 技术参数

生命周期：	Obsolete	包装说明：	, DIE OR CHIP
Reach Compliance Code：	unknown	风险等级：	5.84
Is Samacsys：	N	商用集成电路类型：	CONSUMER CIRCUIT
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装等效代码：	DIE OR CHIP	电源：	5 V
认证状态：	Not Qualified	子类别：	Other Consumer ICs
温度等级：	INDUSTRIAL	Base Number Matches：	1

LM4549MDC 数据手册

February 1999

LM4549

AC ’97 Rev 2.1 Codec with Sample Rate Conversion and

National 3D Sound

General Description

Key Specifications

The LM4549 is an audio codec for PC systems which is fully

PC98 compliant and performs the analog intensive functions

of the AC97 Rev2.1 architecture. Using 18-bit Sigma-Delta

A/D’s and D/A’s, the LM4549 provides 90dB of Dynamic

Range.

n Analog Mixer Dynamic Range

n D/A Dynamic Range

97dB (typ)

89dB (typ)

90dB (typ)

n A/D Dynamic Range

The LM4549 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 A/D’s and D/A’s

and an analog mixer with 4 stereo and 3 mono inputs, each

of which has separate gain, attenuation and mute control.

The codec features a second Line Output known as True

Line Level Out that is identical to Line Out but with indepen-

dent volume control. The LM4549 also features National’s

3D Sound stereo enhancement and variable sample rate

conversion. The sample rate for the A/D and D/A can be pro-

grammed separately with a resolution of 1Hz to convert any

rate between 4kHz-48kHz.

Features

n AC’97 Rev 2.1 compliant

n National’s 3D Sound circuitry

n High quality Sample Rate Conversion (SRC) from 4kHz

to 48kHz in 1Hz increments.

n Multiple Codec Support

n External Amplifier Power Down (EAPD) control from

codec

n PC-Beep passthrough to Line Out while reset is held

active low

The AC97 architecture separates the analog and digital func-

tions of the PC audio system allowing both for system design

flexibility and increased performance.

n True Line Level Output with volume control independent

of Line Out

n Digital 3V and 5V compliant

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

Block Diagram

DS101035-1

FIGURE 1. LM4549 Block Diagram

DS101035

www.national.com

12 3 4 5 6 7...18

中文翻译

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与LM4549MDC相关器件

型号	品牌	获取价格	描述	数据表
LM4549MWC	NSC	获取价格	IC,SOUNDCARD CIRCUITS,WAFER
LM4549VH	NSC	获取价格	AC ’97 Rev 2.1 Codec with Sample Rate Convers
LM4550	NSC	获取价格	AC ’97 Rev 2.1 Multi-Channel Audio Codec with
LM4550B	NSC	获取价格	AC 97 Rev 2.1 Multi-Channel Audio Codec with Stereo Headphone Amplifier, Sample Rate Conve
LM4550B	TI	获取价格	LM4550B AC 97 Rev 2.1 Multi-Channel Audio Codec
LM4550BVH	TI	获取价格	LM4550B AC 97 Rev 2.1 Multi-Channel Audio Codec
LM4550BVH	NSC	获取价格	AC 97 Rev 2.1 Multi-Channel Audio Codec with Stereo Headphone Amplifier, Sample Rate Conve
LM4550BVH/NOPB	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-48,
LM4550BVH/NOPB	TI	获取价格	LM4550B AC 97 Rev 2.1 Multi-Channel Audio Codec With Stereo Headphone Amplifier, Sample Ra
LM4550BVHX	TI	获取价格	LM4550B AC 97 Rev 2.1 Multi-Channel Audio Codec

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