Datasheet > LM4548AVH

LM4548AVH

更新时间： 2024-11-11 05:42:23

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
28页	534K
描述
AC ’97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound

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LM4548AVH 数据手册

May 2004

LM4548A

AC ’97 Rev 2 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 LM4548A 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 LM4548A provides 90 dB

of Dynamic Range.

n ADC Dynamic Range

Features

The LM4548A 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

LM4548A 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 LM4548A suitable

for non-PC codec applications.

n AC ’97 Rev 2 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 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

n General and Multi-channel audio frequency systems

The LM4548A 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.

LM4548A 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 LM4548A may also be used in systems

with the National LM4550 to support up to 6 simultaneous

channels 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.

DS200300

www.national.com

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与LM4548AVH相关器件

型号	品牌	获取价格	描述	数据表
LM4548AVHX	NSC	获取价格	IC,SOUNDCARD CIRCUITS,CMOS,QFP,48PIN,PLASTIC
LM4548MDC	TI	获取价格	IC,SOUNDCARD CIRCUITS,CMOS,DIE
LM4548MWC	TI	获取价格	LM4548MWC
LM4548VH	NSC	获取价格	AC ’97 Rev 2 Codec with Sample Rate Conversio
LM4548VH/NOPB	TI	获取价格	SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, TQFP-48
LM4548VHX	TI	获取价格	SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, TQFP-48
LM4548VHX/NOPB	TI	获取价格	SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, TQFP-48
LM4549	NSC	获取价格	AC ’97 Rev 2.1 Codec with Sample Rate Convers
LM4549A	NSC	获取价格	AC ’97 Rev 2.1 Codec with Sample Rate Convers
LM4549AVH	NSC	获取价格	AC ’97 Rev 2.1 Codec with Sample Rate Convers

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