LM4946TM Datasheet

IC型号：
LM4946TM
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National Semiconductor [Output Capacitor-Less Audio Subsyst...
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LM4946 Output Capacitor-Less Audio Subsystem with Programmable National 3D

June 2007

LM4946

Output Capacitor-Less Audio Subsystem with

Programmable National 3D

General Description

The LM4946 is an audio power amplifier capable of delivering

540mW of continuous average power into a mono 8鈩?/div>

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

of continuous average power into stereo 32鈩?single-ended

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

configuration with identical specifications as the SE configu-

ration, from a 3.3V power supply.

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 I

C or a three-

wire SPI compatible interface that allows flexibility in routing

and mixing audio channels.

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 sev-

en external components in the OCL mode (two additional

components in SE mode).

Key Specifications

鈻犫€?/div>

THD+N at 1kHz, 540mW

鈥?/div>

into 8鈩?BTL (3.3V)

鈻犫€?/div>

THD+N at 1kHz, 35mW

鈥?/div>

into 32鈩?SE (3.3V)

鈻犫€?/div>

Single Supply Operation (V

)

鈻犫€?/div>

C/SPI Single Supply Operation

鈥傗€?/div>

LLP

鈥傗€?/div>

micro SMD

2.2 to 5.5V

1.7 to 5.5V

1.0% (typ)

2.7 to 5.5V

Features

鈻?/div>

C/SPI Control Interface

鈻?/div>

C/SPI programmable National 3D Audio

鈻?/div>

C/SPI controlled 32 step digital volume control (-54dB to

鈻?/div>

+18dB)

Three independent volume channels (Left, Right, Mono)

Eight distinct output modes

LLP and microSMD surface mount packaging

鈥淐lick

and Pop鈥?suppression circuitry

Thermal shutdown protection

Low shutdown current (0.02uA, typ)

RF immunity topology

Applications

鈻?/div>

Mobile Phones

鈻?/div>

PDAs

Boomer庐 is a registered trademark of National Semiconductor Corporation.

漏 2007 National Semiconductor Corporation

201628

www.national.com

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