LM4550B

更新时间： 2024-01-26 12:21:00

品牌	Logo	应用领域
美国国家半导体 - NSC		解码器编解码器放大器
页数	文件大小	规格书
31页	992K
描述
AC 97 Rev 2.1 Multi-Channel Audio Codec with Stereo Headphone Amplifier, Sample Rate Conversion and National 3D Sound

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中文翻译

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技术参数
数据手册

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LM4550B 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	LFQFP, QFP48,.35SQ,20	Reach Compliance Code：	compliant
HTS代码：	8542.39.00.01	风险等级：	5.59
其他特性：	IT ALSO REQUIRES 3V TO 5.5V DIGITAL SUPPLY	商用集成电路类型：	CONSUMER CIRCUIT
JESD-30 代码：	S-PQFP-G48	JESD-609代码：	e3
长度：	7 mm	湿度敏感等级：	3
功能数量：	1	端子数量：	48
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	LFQFP
封装等效代码：	QFP48,.35SQ,20	封装形状：	SQUARE
封装形式：	FLATPACK, LOW PROFILE, FINE PITCH	峰值回流温度（摄氏度）：	260
电源：	3.3/5,5 V	认证状态：	Not Qualified
座面最大高度：	1.6 mm	子类别：	Other Consumer ICs
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.2 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.5 mm	端子位置：	QUAD
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	7 mm
Base Number Matches：	1

LM4550B 数据手册

September 2005

LM4550B

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

Headphone Amplifier, Sample Rate Conversion and

National 3D Sound

General Description

Key Specifications

n Analog Mixer Dynamic Range

n DAC Dynamic Range

n ADC Dynamic Range

n Headphone Amp THD+N at 50 mW

into 32Ω

97 dB (typ)

89 dB (typ)

90 dB (typ)

0.02% (typ)

The LM4550B 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 LM4550B provides 90 dB

of Dynamic Range.

The LM4550B 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

LM4550B provides a stereo headphone amplifier as one of

its stereo outputs and also supports National’s 3D Sound

stereo enhancement and a comprehensive sample rate con-

version 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 appli-

cation software development. These features together with

an extended temperature range also make the LM4550B

suitable for non-PC codec applications.

Features

n AC ’97 Rev 2.1 compliant

n High quality Sample Rate Conversion from 4 kHz to 48

kHz in 1 Hz increments

n Supports up to 6 DAC channel systems with multiple

LM4550Bs or with other National LM45xx codecs

n Unique National chaining function shares a single

controller SDATA_IN pin among multiple codecs

n Stereo headphone amp 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

The LM4550B features the ability to connect several codecs

together in a system to provide up to 6 simultaneous chan-

nels of streaming data on Output Frames (Controller to

Codec) for surround sound applications. Such systems can

also support up to 8 simultaneous channels of streaming

data on Input Frames (Codec to Controller). Multiple codec

systems can be built either using the standard AC Link

configuration (i.e. of one serial data signal to the Controller

per codec) or using a unique National Semiconductor fea-

ture for chaining codecs together. This chain feature shares

only a single data signal to the controller among multiple

codecs.

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 Audio Frequency Systems requiring 2, 4 or 6

DAC channels and/or up to 8 ADC channels

n Automotive telematics

The AC ’97 architecture separates the analog and digital

functions of the PC audio system allowing both for system

design flexibility and increased performance.

DS201237

www.national.com

12 3 4 5 6 7...31

中文翻译

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与LM4550B相关器件

型号	品牌	获取价格	描述	数据表
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
LM4550BVHX/NOPB	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48, Consumer IC:Othe
LM4550BVHX/NOPB	TI	获取价格	LM4550B AC 97 Rev 2.1 Multi-Channel Audio Codec With Stereo Headphone Amplifier, Sample Ra
LM4550VH	NSC	获取价格	AC ’97 Rev 2.1 Multi-Channel Audio Codec with
LM4550VH	ROCHESTER	获取价格	SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 X 1.40 MM, LQFP-48
LM4550VHX	ROCHESTER	获取价格	SPECIALTY CONSUMER CIRCUIT, PQFP48, 7 X 7 X 1.40 MM, LQFP-48

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