LM4846TL datasheet(1/19 Pages) NSC

tên linh kiện	LM4846TL

Giải thích chi tiết về linh kiện	Output Capacitor-less Audio Subsystem with Programmable National 3D

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LM4846

Output Capacitor-less Audio Subsystem with

Programmable National 3D

General Description

The LM4846 is an audio power amplifier capable of deliver-

ing 500mW of continuous average power into a mono 8

Ω

bridged-tied load (BTL) with 1% THD+N, 25mW per channel

of continuous average power into stereo 32

Ω single-ended

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

(OCL) configuration with identical specification as the SE

configuration, from a 3.3V power supply.

The LM4846 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 pro-

grammed through a two-wire I

2C or a three-wire SPI com-

patible interface that allows flexibility in routing and mixing

audio channels. The LM4846 has three input channels: one

pair for a two-channel stereo signal and the third for a

single-channel mono input.

The LM4846 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).

Key Specifications

j THD+N at 1kHz, 500mW

into 8

Ω BTL (3.3V)

1.0% (typ)

j THD+N at 1kHz, 30mW

into 32

Ω SE (3.3V)

1.0% (typ)

j Single Supply Operation (VDD)

2.7 to 5.5V

j I

2C/SPI Single Supply Operation

2.2 to 5.5V

Features

n

I

2C/SPI Control Interface

n

I

2C/SPI programmable National 3D Audio

n

I

2C/SPI controlled 32 step digital volume control (-54dB

to +18dB)

n

Three independent volume channels (Left, Right, Mono)

n

Eight distinct output modes

n

microSMD surface mount packaging

n

“Click and Pop” suppression circuitry

n

Thermal shutdown protection

n

Low shutdown current (0.1uA, typ)

Applications

n

Moblie Phones

n

PDAs

Boomer® is a registered trademark of National Semiconductor Corporation.

December 2005

DS201668

www.national.com

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