Datasheet > L4946SQ

L4946SQ

更新时间： 2024-09-26 04:21:19

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
28页	1279K
描述
Output Capacitor-Less Audio Subsystem with Programmable National 3D

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L4946SQ 数据手册

May 2006

LM4946

Output Capacitor-Less Audio Subsystem with

Programmable National 3D

General Description

Key Specifications

The LM4946 is an audio power amplifier capable of deliver-

ing 540mW of continuous average power into a mono 8Ω

bridged-tied load (BTL) with 1% THD+N, 35mW per channel

of continuous average power into stereo 32Ω single-ended

(SE) loads with 1% THD+N, or an output capacitor-less

(OCL) configuration with identical specifications as the SE

configuration, from a 3.3V power supply.

THD+N at 1kHz, 540mW

into 8Ω BTL (3.3V)

1.0% (typ)

THD+N at 1kHz, 35mW

into 32Ω SE (3.3V)

1.0% (typ)

2.7 to 5.5V

2.2 to 5.5V

Single Supply Operation (V_DD

I²C/SPI Single Supply Operation

)

The LM4946 has three input channels: one pair for a two-

channel stereo signal and the third for a differential single-

channel mono input. The LM4946 features a 32-step digital

volume control and eight distinct output modes. The digital

volume control, 3D enhancement, and output modes (mono/

SE/OCL) are programmed through a two-wire I²C or a three-

wire SPI compatible interface that allows flexibility in routing

and mixing audio channels.

Features

n I²C/SPI Control Interface

n I²C/SPI programmable National 3D Audio

n I²C/SPI controlled 32 step digital volume control (-54dB

to +18dB)

n Three independent volume channels (Left, Right, Mono)

n Eight distinct output modes

n LLP surface mount packaging

n “Click and Pop” suppression circuitry

n Thermal shutdown protection

The LM4946 is designed for cellular phone, PDA, and other

portable handheld applications. It delivers high quality output

power from a surface-mount package and requires only

seven external components in the OCL mode (two additional

components in SE mode).

n Low shutdown current (0.02uA, typ)

n RF immunity topology

Applications

n Mobile Phones

n PDAs

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

DS201628

www.national.com

12 3 4 5 6 7...28

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