LM49150TL

更新时间： 2024-09-10 11:36:31

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器商用集成电路放大器
页数	文件大小	规格书
28页	748K
描述
Mono Class D Audio Subsystem with Earpiece Driver and Stereo Ground Referenced Headphone Amplifiers

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LM49150TL 数据手册

March 4, 2009

LM49150

Mono Class D Audio Subsystem with Earpiece Driver and

Stereo Ground Referenced Headphone Amplifiers

General Description

Key Specifications

The LM49150 is a fully integrated audio subsystem designed

for portable handheld applications such as cellular phones.

Part of National's Power Wise® product family, the LM49150

consumes very low power in the various modes of operation

and still providing great audio performance. The LM49150

combines a 1.25W mono E²S (Enhanced Emission Suppres-

sion) class D amplifier, 135mW Class AB earpiece amplifier,

42mW/channel stereo ground reference headphone ampli-

fiers, volume control, and mixing circuitry into a single device.

■ꢀOutput power at V_DD= 5V:

ꢀSpeaker:

ꢀꢀR_L= 8Ω BTL, THD+N ≤ 1%

1.25W (typ)

42mW (typ)

135mW (typ)

ꢀHeadphone:

ꢀꢀR_L= 32Ω SE, THD+N ≤ 1%

ꢀEarpiece:

ꢀꢀR_L= 8Ω SE, THD+N ≤ 1%

The filterless class D amplifier delivers 1.25W into an 8Ω load

with <1% THD+N with a 5V supply. The E²S class D amplifier

features a patented, ultra low EMI PWM architecture that sig-

nificantly reduces RF emissions while preserving audio qual-

ity. The 42mW/channel headphone drivers feature National’s

ground referenced architecture that creates a ground-refer-

enced output from a single supply, eliminating the need for

bulky and expensive DC-blocking capacitors, saving space

and minimizing cost.

■ꢀOutput power at V_DD= 3.3V:

ꢀSpeaker:

ꢀꢀR_L= 8Ω BTL, THD+N ≤ 1%

520mW (typ)

42mW (typ)

35mW (typ)

ꢀHeadphone:

ꢀꢀR_L= 32Ω BTL, THD+N ≤ 1%

ꢀEarpiece:

ꢀꢀR_L= 8Ω SE, THD+N ≤ 1%

The LM49150 features a fully differential mono input, and two

single-ended stereo inputs. The three inputs can be mixed/

multiplexed to either the speaker or headphone amplifiers.

Each input channel has an independent, 32-step digital vol-

ume control. The headphone output stage features an addi-

tional, 8-step gain control, while the speaker output stage has

a selectable 6dB or 12dB gain. The mixer, volume control and

device mode select are controlled through an I²C compatible

serial interface.

■ꢀOutput Offset

LS Mode

9mV (typ)

1mV (typ)

2.7 to 5.5V

HP Mode

Earpiece

■ꢀSingle Supply Operation (V_DD

■ꢀI²C Single Supply Operation

)

1.7 to 5.5V

The LM49150’s superior click and pop suppression elimi-

nates audible transients on power-up/down and during shut-

down. The LM49150 is available in a ultra-small 20-bump

micro SMD package (2.225mm X 2.644mm).

Features

E²S class D amplifier

■

Ground referenced headphone outputs — eliminates

output coupling capacitors

■

I²C volume and mode control

■

Mono earpiece amplifier

Flexible output for speaker and headphone output

20–bump micro SMD package

Soft enable function

“Click and Pop” suppression circuitry

Thermal shutdown protection

Low supply current

Micro-power shutdown

Applications

Mobile Phones

■

PDAs

Portable Electronics

Boomer® is a registered trademark of National Semiconductor Corporation.

300446

www.national.com

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与LM49150TL相关器件

型号	品牌	获取价格	描述	数据表
LM49150TL/NOPB	NSC	获取价格	IC 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA20, GREEN, MICRO, SMD-20, Audio/Video Amplifier
LM49150TLX	NSC	获取价格	Mono Class D Audio Subsystem with Earpiece Driver and Stereo Ground Referenced Headphone A
LM49150TLX/NOPB	TI	获取价格	Mono Class D Audio Subsystem w/ Earpiece Driver & Stereo Gnd Ref Headphone Amps 20
LM49150TLX/NOPB	NSC	获取价格	IC 2.1 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA20, GREEN, MICRO, SMD-20, Audio/Video Amplifier
LM49151	TI	获取价格	具有集成 125mW 耳机放大器和 42mW 耳机放大器的 1.25W 单声道 D 类音频
LM49151	NSC	获取价格	Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers,
LM49151TL	NSC	获取价格	Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers,
LM49151TL/NOPB	TI	获取价格	具有集成 125mW 耳机放大器和 42mW 耳机放大器的 1.25W 单声道 D 类音频
LM49151TLX	NSC	获取价格	Mono Class D Audio Subsystem with Earpiece Driver, Ground Referenced Headphone Amplifiers,
LM49151TLX/NOPB	TI	获取价格	具有集成 125mW 耳机放大器和 42mW 耳机放大器的 1.25W 单声道 D 类音频

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