LM4845ITL Datasheet

IC型號(hào)：
LM4845ITL
PDF描述：
Output Capacitor-less Audio Subsystem with Programmable Nati...
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LM4845 Output Capacitor-less Audio Subsystem with Programmable National 3D

March 2005

LM4845

Output Capacitor-less Audio Subsystem with

Programmable National 3D

General Description

The LM4845 is an audio power amplifier capable of deliver-

ing 500mW of continuous average power into a mono 8鈩?/div>

bridged-tied load (BTL) with 1% THD+N, 25mW 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 specification as the SE

configuration, from a 3.3V power supply.

The LM4845 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

C or a three-wire SPI com-

patible interface that allows flexibility in routing and mixing

audio channels. The LM4845 has three input channels: one

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

single-channel mono input.

The LM4845 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

THD+N at 1kHz, 500mW

into 8鈩?BTL (3.3V)

THD+N at 1kHz, 25mW

1.0% (typ)

2.7 to 5.5V

2.2 to 5.5V

into 32鈩?SE (3.3V)

Single Supply Operation (V

)

C/SPI Single Supply Operation

Features

C/SPI Control Interface

C/SPI programmable National 3D Audio

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

to +18dB)

Three independent volume channels (Left, Right, Mono)

Eight distinct output modes

microSMD surface mount packaging

鈥淐lick and Pop鈥?suppression circuitry

Thermal shutdown protection

Low shutdown current (0.1uA, typ)

Applications

Moblie Phones

PDAs

Boomer

廬

is a registered trademark of National Semiconductor Corporation.

漏 2005 National Semiconductor Corporation

DS201059

www.national.com

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LM4845ITL Datasheet

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