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LM4851IBL-1 Datasheet

  • LM4851IBL-1

  • Amplifier. Other

  • 16頁(yè)

  • ETC

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LM4851 Integrated Audio Amplifier System
PRELIMINARY
June 2002
LM4851
Integrated Audio Amplifier System
General Description
The LM4851 is an audio power amplifier system capable of
delivering 1W (typ) of continuous average power into a mono
8鈩?bridged-tied load (BTL) with 1% THD+N and 100mW
(typ) per channel of continuous average power into stereo
32鈩?BTL loads with 0.5% THD+N, using a 5V power supply.
The LM4851 features a 32 step digital volume control and
eight distinct output modes. The digital volume control and
output modes are programmed through a three-wire SPI
serial control interface.
Features
n
Mono 1W (typ) and stereo 100mW (typ) output
n
SPI programmable 32 step digital volume control
(-40.5dB to +6dB)
n
Eight distinct SPI programmable output modes
n
micro-SMD surface mount packaging
n
鈥淐lick and pop鈥?suppression circuitry
n
No bootstrap capacitors required
n
Thermal shutdown protection
n
0dB power-up volume
n
Low shutdown current
Key Specifications
n
THD+N at 1kHz, 1W into 8鈩?BTL
n
THD+N at 1kHz, 100mW into 32鈩?BTL
n
Single Supply Operation
1% (typ)
0.5% (typ)
3.0 to 5.0V
Applications
n
Mobile phones
n
PDAs
Typical Application
20040831
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2002 National Semiconductor Corporation
DS200408
www.national.com

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