Datasheet > LM4845

LM4845

更新时间： 2024-11-08 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
29页	1386K
描述
Output Capacitor-less Audio Subsystem with Programmable National 3D

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LM4845 数据手册

March 2005

LM4845

Output Capacitor-less Audio Subsystem with

Programmable National 3D

General Description

Key Specifications

The LM4845 is an audio power amplifier capable of deliver-

ing 500mW of continuous average power into a mono 8Ω

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

configuration, from a 3.3V power supply.

THD+N at 1kHz, 500mW

into 8Ω BTL (3.3V)

1.0% (typ)

THD+N at 1kHz, 25mW

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 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 I²C 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.

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 microSMD surface mount packaging

n “Click and Pop” suppression circuitry

n Thermal shutdown protection

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).

n Low shutdown current (0.1uA, typ)

Applications

n Moblie Phones

n PDAs

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

DS201059

www.national.com

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与LM4845相关器件

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LM4845ITL	NSC	获取价格	Output Capacitor-less Audio Subsystem with Programmable National 3D
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LM4846TL	NSC	获取价格	Output Capacitor-less Audio Subsystem with Programmable National 3D
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