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LM4855LQ Datasheet

  • LM4855LQ

  • National Semiconductor [Boomer AUDIO POWER AMPLIFIER Integ...

  • NSC

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LM4855 Integrated Audio Amplifier System
November 2002
LM4855
Integrated Audio Amplifier System
General Description
The LM4855 is an audio power amplifier system capable of
delivering 1.1W (typ) of continuous average power into a
mono 8鈩?bridged-tied load (BTL) with 1% THD+N and
115mW (typ) per channel of continuous average power into
stereo 32鈩?BTL loads with 0.5% THD+N, using a 5V power
supply.
The LM4855 features a 32 step digital volume control
eight distinct output modes. The digital volume control
output modes are programmed through a three-wire
serial control interface, that allows flexibility in routing
mixing audio channels.
and
and
SPI
and
Key Specifications
n
THD+N at 1kHz, 1.1W into 8鈩?BTL
n
THD+N at 1kHz, 115mW into 32鈩?BTL
n
Single Supply Operation
1.0% (typ)
0.5% (typ)
2.6 to 5.0V
Features
n
n
n
n
n
n
n
n
1.1W (typ) output power with 8鈩?mono BTL load
115mW (typ) output power with stereo 32鈩?BTL loads
SPI programmable 32 step digital volume control
Eight distinct output modes
micro-SMD and LLP surface mount packaging
"Click and Pop" suppression circuitry
Thermal shutdown protection
Low shutdown current (0.1uA, typ)
The LM4855 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 six
external components.
The industry leading micro SMD package only utilizes 2mm
x 2.3mm of PCB space, making the LM4855 the most space
efficient audio sub system available today.
Applications
n
Moblie Phones
n
PDAs
Typical Application
200395D1
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2002 National Semiconductor Corporation
DS200395
www.national.com

LM4855LQ 產(chǎn)品屬性

  • National Semiconductor (TI)

  • Class-AB

  • 1.5 W x 1 at 4 Ohms, 0.115 W x 2 at 32 Ohms

  • 1-Channel Mono, 2-Channel Stereo

  • 0.5 %

  • 3 V

  • 8.5 mA at 5 V

  • + 85 C

  • LLP EP

  • Reel

  • 32 Ohms

  • Single

  • - 40 C

  • Differential

  • Single

  • 5 V

  • 2.6 V

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