Product category: Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LME audio op amps
Edited by the Electronicstalk Editorial Team on 24 July 2007
Audio op amps claim liner precision
High-fidelity audio op amps are claimed to practically eliminate distortion, with total harmonic distortion plus noise (THD+N) of 0.00003%.
National Semiconductor has introduced two LME families of high-fidelity audio op amps that practically eliminate distortion, with total harmonic distortion plus noise (THD+N) of 0.00003% This record low THD+N figure - the result of highly linear behaviour - enables high-end audio manufacturers to produce systems with cleaner: "true to the original recording" sound quality
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
Related stories
Dual-port Gigabit Ethernet transceiver
National Semiconductor has announced the DP83862, a low-cost, highly integrated dual-port 10/100/1000 physical layer transceiver.
World's smallest multifunction supervisory ICs
National Semiconductor has announced a family of supervisory ICs with a variety of factory-programmable features that can be configured in hundreds of possible combinations.
National's 44V audio op amp family includes two package versions of the LME49860 dual, while the 34V family consists of the LME49710 single, LME49720 dual and the LME49740 quad op amps.
They join the multiple award-winning 34V LM4562 dual, high-fidelity audio op amp as the newest members of National's high-performance audio family.
Together they provide audio system designers the highest level of performance, multiple package options and a wide operating voltage range up to plus or minus 22V.
Further reading
Leadless leadframe package shrinks LDO
National Semiconductor has introduced a full-featured 500mA LDO regulator for medium-current applications in computing devices and portable products.
Boomer shrinks stereo headphone amplification
New from National Semiconductor, the LM4811 Boomer audio amplifier is a 105mW stereo headphone amplifier for use in 3 and 5V systems requiring a headphone output and volume control.
Frugal dual-channel A/D conversion
National Semiconductor has introduced a dual-channel 8bit A/D convertor with record low-power dissipation levels.
National's high-performance audio op amps offer remarkably low distortion, low noise, high speed and high output drive.
These features make the op amps well suited for audio/visual (AV) receivers, preamplifiers and mixers, as well as home automation and distribution, speakers, monitors and subwoofers.
They also are ideal for a wide range of demanding nonaudio applications including ultrasound, test and measurement, industrial automation and security.
The 34 and 44V audio op amps offer the key specifications required for superior audio performance and signal conditioning, including low-input noise density of 2.7nV/(rt)Hz, a 1/f noise corner of 60Hz and 600ohm output drive.
To ensure that the most challenging loads are driven without any compromise, these op amps offer a slew rate of 20V/us and a 55MHz gain bandwidth.
National's new op amps add to the company's expanding portfolio of high-performance audio conditioning and power amplifier ICs - including the LM4702 and LME49810 power amplifier drivers- to deliver a complete audio signal-path solution.
The LME49860 is unity-gain stable over a wide supply range of plus or minus 2.5 to 22V and provides output current capability of 26mA.
Over this supply range, the amplifier maintains a common mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) of more than 120dB and a typical low input bias current of 10nA.
The LME49860 offers a full audio dynamic range maximised with an output stage that can swing to within 1V of either power supply voltage when driving 2kohm loads or to within 1.5V when driving 600ohm loads.
The LME49860 retains its high performance while driving capacitive loads as high as 100pF.
It also features thermal shutdown and output short-circuit protection.
The LME49860 is available in 8-lead narrow body SOIC and DIP packages.
A 44V single op amp will be available in Q3 2007.
The LME49710, LME49720 and LME49740 amplifiers are unity-gain stable over a wide supply range of plus or minus 2.5 to 17V and provide output current capability of 45mA.
The LME49710 single and LME49720 dual are available in 8-lead narrow body SOIC, dual inline (DIP) and metal can TO-99 packages.
The LME49740 quad is available in 14-lead narrow body SOIC and DIP packages.
Available now and priced in 100-unit quantities, the LME49860 dual is priced at US $3.36, the LME49710 single is $1.35 and the LME49710's metal can package is $6.92, the LME49720 dual is $2.69 and the LME49720's metal can package is $10.60, and the LME49740 quad is $5.38.
• National Semiconductor: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
