Audio Press Photos

National Semiconductor Celebrated 50 Years of Industry Leadership and Launched Sixth Decade Focused on Energy

May 27, 2009 - Today, National Semiconductor Corp. is celebrating its 50th anniversary. National’s story is one intricately woven into the history of the high-tech industry. When the company was founded, computers were the size of buildings, telephones were wired to walls, televisions were boxes filled with tubes and humans had not yet left the earth’s atmosphere. National’s many technological innovations have shaped the industry and left their mark on the world.

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National Semiconductor’s New Stereo Headphone Amplifier Doubles Audio Playback Time for Portable Devices

April 6, 2009 - National Semiconductor's PowerWise® LM48824 Class G stereo headphone amplifier draws only 0.9 mA (typical) of quiescent current to double the audio playback time of smart phones, full-featured mobile phones and portable music players.

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National Semiconductor Extends Family of Low-Power, Premium Quality Audio Subsystems for Handheld Devices

March 31, 2009 - National Semiconductor's LM49352 mixed-signal audio subsystem and LM49151 analog subsystem offer the lowest power in their class and simplify the design of smart phones, full-featured phones, portable gaming devices and portable GPS devices.

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National Semiconductor Introduces Audio Power Amplifier with Integrated Fault Detection for Automotive Instrument Cluster Applications

October 17, 2008 - National Semiconductor's LM48100Q is the industry’s first monolithic amplifier for automotive warning and alert tone amplification. The LM48100Q amplifies warning tones in automobile driver warning systems such as signal change, back up warning and collision avoidance.

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National Semiconductor Introduces Breakthrough Analog Noise-Suppression Technology at One-Tenth the Power of DSP Solutions

February 28, 2008 - The PowerWise LMV1088 dual-input microphone array amplifier uses National's far-field noise suppression technology to reduce background noise and improve voice communication clarity in mobile phones, two-way radios and powered headsets. The device consumes one-tenth the power (1 mA) of comparable DSP or microprocessor software-based systems, setting a new standard for low power consumption.

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National Semiconductor Introduces Breakthrough Analog Noise-Suppression Technology at One-Tenth the Power of DSP Solutions

February 28, 2008 - The LMV1088 dual-input microphone array amplifier incorporates two differential input microphone amplifier channels, microphone calibration circuitry stored in EEPROM and National Semiconductor’s breakthrough far-field noise suppression processing circuitry.

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National Semiconductor Introduces Industry's Lowest-Noise Audio Buffer

January 21, 2008 - Part of National Semiconductor's high-fidelity LME™ audio amplifier family, the LME49600 buffer delivers the industry's lowest noise and harmonic distortion for professional audio applications.

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National Semiconductor Extends Industry-Leading High-Fidelity Audio Family with New 200V Power Amplifier Input Stages

January 15, 2008 - National Semiconductor's LME49811 and LME49830 are 200V mono audio power amplifier input stages that deliver industry-leading low distortion performance and reduce design time.

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National Semiconductor Expands High-Fidelity Family with New Rail-to-Rail and Current Feedback Operational Amplifiers

October 1, 2007 - Further expanding its high-fidelity operational amplifier family, National Semiconductor introduced a 5V rail-to-rail input and output (RRIO) and a 36V current feedback operational amplifier. The LME49721 RRIO op amp's combined specifications provide the high-fidelity performance and signal conditioning required by high-end portable devices and applications where supply rails are limited to lower voltages. The LME49713 current feedback op amp delivers ultra-low distortion, low noise, extended bandwidth past 190 MHz and fast settling times down to 50 nanoseconds.

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National Semiconductor’s New Audio Amplifier with Spread Spectrum and Integrated Boost Architecture Reduces EMI Sensitivity in Portable Applications

September 26, 2007 - National Semiconductor's LM48511 audio amplifier with spread spectrum and integrated boost converter reduces EMI sensitivity in push-to-talk cell phones, portable GPS, MP3 docking stations with portable speakers, as well as a broad range of other battery-powered applications.

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National Semiconductor’s 200V Audio Power Amplifier Driver Eliminates More Than 25 Discrete Components, Provides Highest Power Per Square-Inch of Chassis Space

July 23, 2007 - The new LME49810 from National Semiconductor is a single-chip 200V power amplifier driver with integrated Baker Clamp that replaces more than 25 discrete components in high-power audio amplifiers. The LME49810 not only reduces system cost and simplifies design, it also enables slimmer, more elegant design capability, with more channels and more power per square-inch of chassis space.

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National Semiconductor Introduces Industry’s Lowest Distortion, High-Fidelity Audio Op Amps

July 23, 2007 - National Semiconductor's new LME™ family of high-fidelity audio op amps practically eliminates distortion, with total harmonic distortion plus noise (THD+N) of 0.00003 percent. This record low THD+N figure enables high-end audio manufacturers to produce systems with cleaner "true to the original recording" sound quality.

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National Semiconductor Delivers Industry’s Most Powerful Ceramic Speaker Driver

May 29, 2007 - National Semiconductor's LM48555 drives ceramic speakers in cell phones, smartphones, notebook computers and other small handheld devices.

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National Semiconductor Introduces Industry’s First Constant Output Class D Audio Amplifier

February 5, 2007 - The LM48510 is the industry's first constant output Class D audio amplifier. It enables manufacturers to design portable products that are able to operate at constant high-level output power even as batteries deplete to lower voltages.

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New Class D Boomer Audio Amplifier from National Semiconductor Significantly Reduces EMI

October 23, 2006 - A new mono, 2.65W, Class D Boomer® audio amplifier from National Semiconductor reduces EMI more than 11 dB below the United States Federal Communications Commission (FCC) limit to lower system noise in portable devices including cell phones, smart phones, music and DVD players, gaming devices and other portable electronics.

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National Semiconductor’s 34V High-Fidelity Audio Op Amp Drops Distortion Rate to 0.00003 Percent

September 25, 2006 - A new dual, high-fidelity audio operational amplifier from National Semiconductor practically eliminates distortion, with total harmonic distortion plus noise (THD+N) of 0.00003 percent.

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National Semiconductor Debuts Industry’s First Integrated, 200V Stereo Driver

September 19, 2006 - National Semiconductor introduced the industry's first integrated, 200V stereo driver for high-power amplifiers. The LM4702, the first member of a new high-performance audio family, is available in three grades, all with mute functions, to suit a variety of demanding consumer and professional audio applications.

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National Semiconductor Expands Family of World’s Smallest Audio Amplifiers

August 14, 2006 - National Semiconductor introduced two Boomer® Class AB amplifiers in a 0.4 mm-pitch package, the world’s smallest micro SMD package. The LM4941 1.25W audio amplifier and LM4985 stereo headphone amplifier provide low quiescent current and high output power, extending battery life in portable electronic devices, MP3 players, mobile phones and other similar applications.

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National Semiconductor’s New Boomer Audio Subsystems with RF Suppression Help Shield High-Frequency Interference

June 19, 2006 - Two new Boomer® audio subsystems from National Semiconductor integrate radio-frequency (RF) suppression technology to improve noise performance in portable applications. National's LM4946 and LM4947 audio subsystems contain a mono amplifier, output capacitor-less (OCL) stereo headphone amplifiers and National's programmable 3D sound enhancement.

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National Semiconductor Introduces New Family of Output Capacitor-less Headphone Amplifiers

May 22, 2006 - National Semiconductor's family of three Boomer® ground-referenced stereo headphone amplifiers, the LM4920, LM4981 and LM4982, eliminates external blocking capacitors for portable music players, mobile phones, CD players, personal digital assistants, media players, notebook computers and other portable applications.

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National Semiconductor Introduces World’s Smallest Class AB Audio Amplifier

April 17, 2006 - National Semiconductor offers the LM4995 Boomer® 1.3W mono Class AB audio amplifier in the world’s smallest micro SMD package for cell phone handsfree and ringer functions.

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National Semiconductor Offers Next-Generation Boomer Audio Amplifiers For Driving Ceramic Speakers in Portable Applications

January 23, 2006 - National Semiconductor introduced two single-chip Boomer® audio power amplifiers in ultra-small packages. The LM4962 and LM4953, the next generation in National’s industry-leading ceramic speaker driver family, provide high capacitive loads for portable applications such as cell phones, smartphones, notebook computers and other small handheld devices.

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National Semiconductor Introduces Industry’s Smallest Audio Subsystem with Class D Speaker Driver

January 9, 2006 - The industry's smallest audio subsystem with a mono Class D speaker driver from National integrates all the analog and digital audio functions needed for smart phones and voice-over-Internet procotol (VoIP) phones. The LM4935 subsystem's new 4 mm by 4 mm micro SMDxt package saves up to 70 percent board space over existing packages.

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National Semiconductor Introduces World’s Smallest Class D Audio Amplifiers

December 19, 2005 - To save even more space in portable applications, National Semiconductor introduced the LM4673, a Boomer® mono Class D audio amplifier in the world's smallest micro SMD package. In addition, the company introduced the LM4674, a high-power stereo Class D amplifier. Both provide high-quality output power with a minimal number of external components for cell phones, smart phones and portable audio devices such as DVD players and gaming devices.

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National Semiconductor Introduces World’s Smallest Class D Audio Amplifiers

December 19, 2005 - To save even more space in portable applications, National Semiconductor introduced a Boomer® mono Class D audio amplifier in the world's smallest package, a 1.4 mm by 1.4 mm, 0.4 mm-pitch micro SMD package. The LM4673 provides high-quality output power with a minimal number of external components for cell phones, smart phones and portable audio devices such as DVD players and gaming devices.

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National Semiconductor Introduces Industry’s First Stereo Audio Subsystem With Both Digital and Analog Inputs

December 12, 2005 - National Semiconductor introduced the LM4934 Boomer® stereo audio subsystem, the industry's first subsystem to incorporate both digital and analog input paths for multimedia, smart and voice-over-Internet procotol (VoIP) phones. The subsystem offers 3D enhancement for improved stereo audio sound in a new package with a small footprint.

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National Semiconductor Introduces Complete Boomer 3D Stereo Audio Subsystem in Miniature Package

September 12, 2005 - National's Boomer® LM4844 audio subsystem simplifies development of superior full-bandwidth stereo and 3D sound in mobile phones and other battery-powered devices.

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National Semiconductor’s New Boomer Audio Amplifiers Consistently Deliver 1.0W and 1.8W Output Power Even as Battery Voltage Drops to 3V

August 9, 2005 - Two new single-chip Boomer® audio amplifiers from National Semiconductor Corporation deliver up to 1.8 Watts of output power to mobile phone and portable devices regardless of the battery's voltage.

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National Semiconductor Introduces Two Boomer 3D Audio Subsystems with Industry’s Highest Integration for Portable Applications

June 14, 2005 - National's LM4845 audio subsystem integrates the audio amplifiers, volume control, mixer, eight output modes, power management control, 3D sound enhancement and I2C compatible control into a single package.  The LM4888 stereo 2.1W speaker and headphone amplifier provides 3D programmability for the speaker and headphone, and ultra-low shutdown current for battery savings.

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National Semiconductor Introduces Simple-to-Use Boomer Audio-Synchronized LED Driver

May 2, 2005 - National Semiconductor's LM4970 is a "no-programming-required" Boomer® audio-synchronized light emitting diode (LED) driver.  Previous designs required pre-programmed I2C compatible code to control lighting patterns.  National's LM4970 gives designers the option of using I2C compatible pattern control or choosing automatic audio-synchronized pattern generation. If the automatic mode is used, no software or memory storage is needed for pattern control, freeing up memory storage space for other features.  The internal control features of the LM4970 reduce the number of external components, optimizing board space in small form factor applications such as cell phones, MP3 players, PDAs and other portable devices.

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National Semiconductor’s Boomer Audio Amplifier Improves RF Suppression in Wireless Notebooks and Other Portable Devices

April 25, 2005 - National's LM4884 Boomer audio amplifier is designed to suppress strong RF signals and produce clean sound in notebook computers enabled with WiFi/802.11, GSM cards or modems.  The device also suppresses RF noise generated by cell phones or other wireless devices operating in close proximity to the notebook computer.

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National Semiconductor's Two Class D Boomer Audio Amplifiers Save Space and Extend Battery Life in Mobile Applications

March 14, 2005 - National Semiconductor's LM4670/71 high-efficiency Class D Boomer® audio amplifiers are housed in tiny micro SMD packages and feature externally configurable gain for space savings and flexibility in design. Additionally, they feature a low power consumption shutdown mode for extended battery life. These two parts are ideal for applications such as cellular phones, PDAs and other portable electronic devices.

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National Semiconductor’s Three New Boomer Speaker Drivers Enable Thinner, Lighter Handsets with Longer Talk Times

January 6, 2005 - National Semiconductor's LM4802B, LM4960 and LM4961 Boomer® audio amplifiers are the industry’s first single-chip devices to drive ceramic and piezoelectric speakers in portable applications. These integrated chips allow manufacturers to create “credit-card-thin” handsets or add additional features to designs because they save space and reduce power consumption, enabling longer battery life and talk time.

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National Semiconductor Introduces New WEBENCH® Online Design Environment for Audio Amplifiers

November 9, 2004 - National Semiconductor's WEBENCH® online design environment now includes audio amplifiers, providing the industry’s first online tool created to speed the selection, design and evaluation of many types of audio amplifiers for a variety of applications.  This tool enables engineers to create an audio amplifier design in minutes.

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National Semiconductor Introduces Two Single-Chip Boomer Integrated Audio Subsystems with Expanded Feature Sets

November 2, 2004 - National's LM4859 and LM4931 Boomer audio subsystems provide a wide variety of features for cellular phones and portable applications  These audio subsystems give customers a huge feature set in a very compact space.  By integrating all of the features that a customer might need into a single package, the LM4859 and LM4931 provide space and system cost savings without sacrificing performance.

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National Semiconductor Introduces Two High Efficiency Class D Boomer Audio Amplifiers for Cellular Phones and Flat Panel Monitors

September 13, 2004 - National Semiconductor's LM4666 and LM4668 are high efficiency Boomer Class D audio amplifiers.  The 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.  The LM4668 is a switching power amplifier designed for demanding applications in flat panel monitors and televisions and computer sound cards.

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National Semiconductor Introduces Three New Audio Amplifiers For High-Quality Home Stereo Systems

March 10, 2004 - National’s new LM4780/81/82 Overture® audio amplifiers feature quiet fade-in/fade-out mute mode circuitry that gradually brings the sound up or down.  These “easy on the ears” transitions enhance the listening experience in compact stereos, high-definition televisions (HDTVs), 5.1 surround sound systems and other consumer electronic equipment.

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National Semiconductor Introduces Filter-less High Efficiency Class D Boomer® Audio Amplifier

January 26, 2004 - National's filter-less high efficiency LM4667 Boomer® audio amplifier is ideal for portable consumer applications such as cellular handsets because of its high efficiency, resulting in less system heat and longer battery life. It is housed in a tiny micro SMD package. The LM4667’s fixed gain reduces pin count and eliminates the need for an output filter when it is located near the speaker, resulting in both space and cost savings.

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National Semiconductor Introduces Boomer Stereo Audio Subsystem With 3D Sound

November 19, 2003 - National Semiconductor's LM4857 Boomer® stereo audio subsystem for cell phones integrates amplifiers, volume and mixing controls and 3D sound in a miniature micro SMD package.

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National Semiconductor Introduces Integrated Audio Subsystem to Support Both Voice and Digital Audio in Portable Devices

September 2, 2003 - National's LM4930 is a single-chip analog audio subsystem for mobile phones and other portable applications that supports both voice and digital audio. It offers designers an easy-to-use structure and three digital interfaces. Integrated onto a single 36-bump micro SMD package, these interfaces include pulse code modulation (PCM) for digital voice data, I2S for digital stereo audio from sources such as MP3, and an I2C interface.

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National Semiconductor Introduces Industry’s First Audio Amplifier That Eliminates Bypass Capacitor

August 18, 2003 - The LM4906 Boomer® audio amplifier eliminates the bypass capacitor typically connected to the reference voltage pin.  National’s new architecture improves power supply rejection ratio (PSRR) and provides very fast turn-on times. These features make the LM4906 ideally suited for applications in small, portable devices such as mobile phones and notebook computers.

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National Semiconductor Introduces Boomer Headphone Amplifier For Portable Audio Applications Powered By Single-Cell Battery

July 28, 2003 - The LM4916’s small size minimizes board space, while the surface mount package maximizes output power in the device. This product is suited for applications in small, portable, one-cell audio applications and consumer devices such as personal CD and mini disc players and electronic toys and games.

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National Semiconductor Integrates Speaker and Headphone Amplifiers to Create Single-Chip Audio Solution for Portable Devices

June 3, 2002 - The LM4854 is an integrated Boomer® stereo headphone amplifier and mono speaker amplifier designed for applications in small portable electronic devices such as cellular phones, PDAs and notebook computers.

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National Semiconductor Introduces Two New 5V Boomer Stereo Headphone Amplifiers for Portable Applications

March 25, 2002 - The LM4910 and LM4911 are two Boomer® stereo headphone amplifiers with space-saving features that make them ideally-suited for headphone applications in small, portable devices such as mobile phones, PDAs, MP3 players and other portable electronic equipment.

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National Semiconductor Targets Cellular Market with the Introduction of Two High Power Supply Rejection Ratio (PSRR) Boomer Audio Amplifiers

August 20, 2001 - The LM4894 and LM4895 Boomer® audio amplifiers are optimized for the cellular phone market, delivering the best possible PSRR performance available in the industry.

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National Semiconductor Broadens Audio Portfolio with Five New Boomer Audio Amplifiers Designed for Portable Applications

June 12, 2001 - The LM4900, LM4892, LM4819, LM4809 and LM4810 are the five new audio products designed for demanding applications in notebook computers, PDAs, cellular phones, MP3 players, information appliances and other battery-powered devices expanding National's popular Boomer® line of audio amplifiers.

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National Semiconductor Introduces World's First Popless, Clickless Dual 2.1 Watt Boomer Audio Amplifier

February 26, 2001 - The LM4867 Boomer® amplifier is the world’s first truly noise-free 2.1W stereo amplifier with headphone mode.

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National Semiconductor Introduces Industry's First Stereo Headphone Amplifier With Digital Up/Down Volume Control in Leadless Leadframe Package

February 5, 2001 - The LM4811 Boomer® audio amplifier is a 105mW stereo headphone amplifier for use in 3V and 5V systems requiring a headphone output and volume control.

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National Semiconductor Introduces Boomer® Audio Amplifier In Leadless Leadframe Package

October 23, 2000 - The popular LM4871 Boomer® audio amplifier is now in a leadless leadframe package (LLP), a packaging innovation that will enable more power density in a smaller package for maximum performance and space savings.

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National Semiconductor Introduces Industry's First Micro SMD Cellular Boomer Amplifier

September 12, 2000 - The LM4890 is the next generation of industry-leading Boomer® audio amplifiers for cell phones.

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National Semiconductor Introduces World's First 170 Watt, 85% Efficient Class D Audio Power Amplifier Chipset For Compact, High-Fidelity Subwoofer Designs

March 20, 2000 - LM4651/LM4652 a two-chip driver and quad MOSFET amplifier set for high-fidelity Class D subwoofer designs. This chipset provides up to 170 watts of audio power at an excellent 85% efficiency, with smaller space and lower cost.

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National Semiconductor Introduces High-Efficiency, High-Fidelity, 2.0W Class D Stereo Audio Amplifier IC

February 28, 2000 - A high-efficiency, high-fidelity Class D stereo audio amplifier IC. The LM4663 can output 2.0W per channel of RMS power into a 4O load with less than 0.2% THD+N.

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National Semiconductor Announces Newest Two Watt Stereo Boomer Audio Amplifier

July 12, 1999 - The LM4836 is a member of the company's line of Boomer® audio power amplifiers for notebook computers, strengthening National's position as the dominant supplier of the most comprehensive audio amplifier solutions for the notebook PC.

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