Datasheet > LM49370

LM49370

更新时间： 2024-02-13 02:06:37

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器
页数	文件大小	规格书
100页	2708K
描述
Audio Sub-System with an Ultra Low EMI, Spread Spectrum, Class D Loudspeaker Amplifier

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LM49370 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	VFBGA, BGA49,7X7,20	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.33.00.01
Factory Lead Time：	1 week	风险等级：	7.57
商用集成电路类型：	CONSUMER CIRCUIT	JESD-30 代码：	S-XBGA-B49
JESD-609代码：	e2	长度：	3.88 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	49	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	UNSPECIFIED
封装代码：	VFBGA	封装等效代码：	BGA49,7X7,20
封装形状：	SQUARE	封装形式：	GRID ARRAY, VERY THIN PROFILE, FINE PITCH
峰值回流温度（摄氏度）：	260	电源：	1.8,3.3 V
认证状态：	Not Qualified	座面最大高度：	0.725 mm
子类别：	Audio/Video Amplifiers	最大供电电压 (Vsup)：	4.5 V
最小供电电压 (Vsup)：	2.5 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	TIN SILVER
端子形式：	BALL	端子节距：	0.5 mm
端子位置：	BOTTOM	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3.88 mm	Base Number Matches：	1

LM49370 数据手册

February 2007

LM49370

Audio Sub-System with an Ultra Low EMI, Spread

Spectrum, Class D Loudspeaker Amplifier, a Dual-Mode

Stereo Headphone Amplifier, and a Dedicated PCM

Interface for Bluetooth Transceivers

SNR_LS(AUX IN to Loudspeaker)

SNR_DAC(Stereo DAC to AUXOUT)

SNR_ADC(Mono ADC from Cell Phone In)

SNR_HP(Aux In to Headphones)

90 dB (typ)

■

1.0 General Description

85 dB (typ)

90 dB (typ)

98 dB (typ)

The LM49370 is an integrated audio subsystem that supports

both analog and digital audio functions. The LM49370 in-

cludes a high quality stereo DAC, a mono ADC, a stereo

headphone amplifier, which supports output cap-less (OCL)

or AC-coupled (SE) modes of operation, a mono earpiece

amplifier, and an ultra-low EMI spread spectrum Class D

loudspeaker amplifier. It is designed for demanding applica-

tions in mobile phones and other portable devices.

4.0 Features

Spread Spectrum Class D architecture reduces EMI

Mono Class D 8Ω amplifier, 490 mW at 3.3V

OCL or AC-coupled headphone operation

33mW stereo headphone amplifier at 3.3V

115 mW earpiece amplifier at 3.3V

18-bit stereo DAC

■

The LM49370 features a bi-directional I²S interface and a bi-

directional PCM interface for full range audio on either inter-

face. The LM49370 utilizes an I²C or SPI compatible interface

for control. The stereo DAC path features an SNR of 85 dB

with an 18-bit 48 kHz input. In SE mode the headphone am-

plifier delivers at least 33 mW_RMSto a 32Ω single-ended

stereo load with less than 1% distortion (THD+N) when

A_V_DD= 3.3V. The mono earpiece amplifier delivers at least

115mW_RMSto a 32Ω bridged-tied load with less than 1% dis-

tortion (THD+N) when A_V_DD= 3.3V. The mono speaker

amplifier delivers up to 490mW into an 8Ω load with less than

1% distortion when LS_V_DD= 3.3V and up to 1.2W when

LS_V_DD= 5.0V.

16-bit mono ADC

8 kHz to 192 kHz stereo audio playback

8 kHz to 48 kHz mono recording

Bidirectional I²S compatible audio interface

Bidirectional PCM compatible audio interface for

Bluetooth transceivers

I²S-PCM Bridge with sample rate conversion

■

Sigma-Delta PLL for operation from any clock at any

sample rate

Digital 3D Stereo Enhancement

The LM49370 employs advanced techniques to reduce pow-

er consumption, to reduce controller overhead, to speed de-

velopment time, and to eliminate click and pop. Boomer audio

power amplifiers were designed specifically to provide high

quality output power with a minimal amount of external com-

ponents. It is therefore ideally suited for mobile phone and

other low voltage applications where minimal power con-

sumption, PCB area and cost are primary requirements.

■

FIR filter programmability for simple tone control

Low power clock network operation if a 12 MHz or 13 MHz

system clock is available

Read/write I²C or SPI compatible control interface

Automatic headphone & microphone detection

Support for internal and external microphones

Automatic gain control for microphone input

Differential audio I/O for external cellphone module

Mono differential auxiliary output

■

2.0 Applications

Smart phones

■

Mobile Phones and Multimedia Terminals

PDAs, Internet Appliances and Portable Gaming

Stereo auxiliary inputs

Portable DVD/CD/AAC/MP3 Players

Differential microphone input for internal microphone

Flexible audio routing from input to output

32 Step volume control for mixers in 1.5 dB steps

16 Step volume control for microphone in 2 dB steps

Programmable sidetone attenuation in 3 dB steps

Two configurable GPIO ports

Digital Cameras/Camcorders

■

3.0 Key Specifications

P_{HP (AC-COUP)}(A_V_DD= 3.3V, 32Ω, 1% THD)

P_{HP (OCL)}(A_V_DD= 3.3V, 32Ω, 1% THD)

P_LS( LS_V_DD= 5V, 8Ω, 1% THD)

P_LS(LS_V_DD= 4.2V, 8Ω, 1% THD)

P_LS(LS_V_DD= 3.3V, 8Ω, 1% THD)

Shutdown Current

33 mW

31 mW

1.2 W

900 mW

490 mW

0.8 µA

■

Multi-function IRQ output

Micro-power shutdown mode

Available in the 4 x 4 mm 49 bump micro SMDxt package

PSRR_LS(217 Hz, LS_V_DD= 3.3V)

70 dB

Boomer® is a registered trademark of National Semiconductor Corporation.

201917

www.national.com

12 3 4 5 6 7...100

中文翻译

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与LM49370相关器件

型号	品牌	获取价格	描述	数据表
LM49370_08	NSC	获取价格	Audio Sub-System with an Ultra Low EMI, Spread Spectrum, Class D Loudspeaker Amplifier, a
LM49370RL	NSC	获取价格	Audio Sub-System with an Ultra Low EMI, Spread Spectrum, Class D Loudspeaker Amplifier
LM49370RL/NOPB	TI	获取价格	BoomerÂ® Audio Power Amplifier Series Audio S
LM49370RLX	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PBGA49, 4 X 4 MM, MICRO, SMDXT-49, Consumer IC:Other
LM49370RLX/NOPB	TI	获取价格	BoomerÂ® Audio Power Amplifier Series Audio S
LM49370RLX-NOPB	TI	获取价格	BoomerÂ® Audio Power Amplifier Series Audio S
LM4937RL	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PBGA36, MICRO, SMD-36, Consumer IC:Other
LM4937TL	NSC	获取价格	Audio Sub-System with OCL Stereo Headphone Output and RF Suppression
LM4937TL/NOPB	NSC	获取价格	IC SPECIALTY CONSUMER CIRCUIT, PBGA36, ROHS COMPLIANT, MICRO, SMD-36, Consumer IC:Other
LM4937TLX	TI	获取价格	IC,AUDIO AMPLIFIER,SINGLE,BGA,36PIN,PLASTIC

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