LM48824TM

更新时间： 2024-01-26 11:40:04

品牌	Logo	应用领域
美国国家半导体 - NSC		音频控制集成电路消费电路商用集成电路放大器
页数	文件大小	规格书
28页	1115K
描述
Class G Headphone Amplifier with I2C Volume Control

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LM48824TM 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	VFBGA, BGA16,4X4,16
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.33.00.01	Factory Lead Time：	6 weeks
风险等级：	1.16	信道分离：	110 dB
商用集成电路类型：	VOLUME CONTROL CIRCUIT	谐波失真：	5.5%
JESD-30 代码：	S-XBGA-B16	JESD-609代码：	e1
湿度敏感等级：	1	信道数量：	2
功能数量：	1	端子数量：	16
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：	BGA16,4X4,16	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：	3.6 V	认证状态：	Not Qualified
子类别：	Audio/Video Amplifiers	最大压摆率：	1.3 mA
最大供电电压 (Vsup)：	3.6 V	最小供电电压 (Vsup)：	2.4 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	Tin/Silver/Copper (Sn/Ag/Cu)	端子形式：	BALL
端子节距：	0.4 mm	端子位置：	BOTTOM
处于峰值回流温度下的最长时间：	NOT SPECIFIED

LM48824TM 数据手册

August 31, 2009

LM48824

Class G Headphone Amplifier with I²C Volume Control

General Description

Key Specifications

The LM48824 is a Class G, ground-referenced stereo head-

phone amplifier designed for portable devices. The LM48824

features National’s ground-referenced architecture, which

eliminates the large DC blocking capacitors required by tra-

ditional headphone amplifiers, saving board space and mini-

mizing system cost.

■ Quiescent Power Supply Current at 3.6V

■ Output Power/channel at V_DD= 3.6V

R_L= 16Ω, THD+N ≤ 1%

0.9mA (typ)

37mW (typ)

■ Output Power/channel at V_DD= 3.6V

R_L= 32Ω, THD+N ≤ 1%

The LM48824 takes advantage of National’s patent-pending

Class G architecture offering power savings compared to a

traditional Class AB headphone amplifier. Additionally, output

noise is improved by common-mode sensing that corrects for

any differences between the amplifier ground and the poten-

tial at the headphone return terminal, minimizing noise creat-

ed by any ground mismatches.

29mW (typ)

100dB (typ)

■ PSRR at 217Hz

■ Shutdown current

2.5μA (typ)

Features

Class G Power Savings

■

A high output impedance mode allows the LM48824's outputs

to be driven by an external source without degrading the sig-

nal. Other features include flexible power supply require-

ments, differential inputs for improved noise rejection, a low

power (2.5μA) shutdown mode, and a 32-step I²C volume

control with mute function.

Ground Referenced Headphone Outputs – Eliminates

Output Coupling Capacitors

■

Common-Mode Sense

■

I²C Volume and Mode Control

High Output Impedance in Shutdown

Differential Inputs

The LM48824's superior click and pop suppression eliminates

audible transients on power-up/down and during shutdown.

The LM48824 is available in an ultra-small 16-bump, 0.4mm

pitch micro SMD package (1.69mm x 1.69mm)

Advanced Click-and-Pop Suppression

Low Supply Current

Low THD mode option

Applications

Mobile Phones, PDAs, MP3 Players

■

Portable Electronic Devices, Notebook PCs

Simplified Block Diagram

30089221

Boomer^®is a registered trademark of National Semiconductor Corporation.

300892

www.national.com

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