Datasheet > LM4546A

LM4546A

更新时间： 2024-09-27 11:36:27

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	1326K
描述
AC 97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound

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LM4546A 数据手册

OBSOLETE

July 15, 2009

LM4546A

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

Conversion and National 3D Sound

General Description

Key Specifications

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.

Analog Mixer Dynamic Range

97 dB (typ)

89 dB (typ)

90 dB (typ)

■

DAC Dynamic Range

ADC Dynamic Range

■

Features

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.

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 ≤ T_A≤ 85°C

Applications

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

■

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.

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.

200308

www.national.com

200308 Version 5 Revision 1 Print Date/Time: 2009/07/15 15:26:52

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与LM4546A相关器件

型号	品牌	获取价格	描述	数据表
LM4546AVH	NSC	获取价格	AC 97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound
LM4546AVHX	TI	获取价格	SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48
LM4546AVHX	ROCHESTER	获取价格	SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48
LM4546B	NSC	获取价格	AC ’97 Rev 2 Multi-Channel Audio Codec with S
LM4546B	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
LM4546BVH/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
LM4546BVH/NOPB	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48, Consumer IC:Othe
LM4546BVHX	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48, Consumer IC:Othe
LM4546BVHX/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
LM4546MWC	TI	获取价格	IC SPECIALTY CONSUMER CIRCUIT, UUC, WAFER, Consumer IC:Other

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