Product category: Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LM4854
Edited by the Electronicstalk Editorial Team on 10 June 2002
Two amps in one handle all cellular
audio
The LM4854 is an integrated Boomer stereo headphone amplifier and mono speaker amplifier ideally suited for small portable electronics such as cellular phones, PDAs and notebook computers.
The LM4854 is an integrated Boomer stereo headphone amplifier and mono speaker amplifier ideally suited for small portable electronics such as cellular phones, PDAs and notebook computers "National Semiconductor is responding to the needs of the market by integrating more and more audio components into smaller packages", said Thomas Eikenberg, marketing engineer at National's audio amplifier product group in Europe
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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What used to be a two-chip solution is now a single-chip solution.
The single-chip LM4854 saves our customers both component and board space costs".
The LM4854 integrates a 1.9W mono speaker amplifier and an 85mW stereo headphone amplifier for use in 3 and 5V systems requiring a mono speaker output and a headphone output.
This device has a fast 0.1ms turn-on and turn-off time.
Switching from mono BTL to an SE headphone configuration is accomplished using a headphone sense pin.
National's LM4854 features advanced pop and click suppression circuitry for quieter turn-on and turn-off.
This device also eliminates output coupling capacitors, saving component count and board space.
Other features include an active-low micropower shutdown mode, an "instant-on" low-power standby mode, and thermal shutdown protection circuitry.
The LM4854 is available now in 12-bump micro SMD, 14-pin LLP and 14-pin TSSOP packaging, and is priced at $1.10 in 1000-unit quantities.
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