Product category: Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LM4666 and LM4668
Edited by the Electronicstalk Editorial Team on 24 September 2004
Audio amps aim for handsets and monitors
National Semiconductor has expanded its audio Class D portfolio with two high efficiency Boomer audio amplifiers.
National Semiconductor has expanded its audio Class D portfolio with two high efficiency Boomer audio amplifiers National's LM4666 is a stereo speaker amplifier with selectable gain to give customers flexibility and ease of use in cellular phones and other portable handheld devices
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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The LM4668 is a switching power amplifier designed for demanding applications in flat panel monitors and televisions and computer sound cards.
"The LM4666 and LM4668 Class D amplifiers address two very distinct needs for our customers", said Gary Adrig, Marketing Director for National Semiconductor's audio products group.
"Manufacturers of flat panel monitors and TVs demand superior audio performance and efficiency".
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"The LM4668 has soft-start circuitry to eliminate noise during turn-on transitions and fixed, internally set gain for customers' ease of use".
"Handset makers will prefer the LM4666, which offers higher efficiency for reduced overall system heat and longer battery life - essential for products with small board areas that are extremely sensitive to heat dissipation".
National's LM4666 is a 1.3W per channel, high-efficiency, fully differential Class D stereo speaker amplifier with selectable gain of 6-12dB.
In addition to flexibility and ease of use, selectable gain in this one-chip stereo solution reduces overall system cost by minimising component costs and board space.
The high efficiency of this part reduces power consumption and minimises heat dissipation from the amplifier within the system, leading to extended battery life and increased talk time in cellular applications.
Additionally, the LM4666's delta-sigma modulation technique lowers output noise and total harmonic distortion (THD) when compared with conventional pulsewidth modulation (PWM) Class D amplifiers.
The LM4668 is a 10W high efficiency mono audio power amplifier with a gain of 30dB.
It provides 10W wats of power into an 8ohm load at 10% total harmonic distortion plus noise (THD+N) from a 14V power supply.
Because of this part's high efficiency, it reduces overall heat dissipation, making the customers' applications more reliable.
The LM4668 also uses a unique balanced PWM that makes it more immune to noise for a quieter user experience.
This device is ideal for flat panel displays, such as PC monitors and TVs, as these applications require small IC footprints and low heat dissipation.
The LM4666 is available now in 14-lead LLP packaging and is priced at $0.90.
The LM4668 is available now in 14-lead LLP packaging priced at $1.58, and 20-lead TSSOP packaging priced at $1.58.
All prices are for 1000-unit quantities.
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