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National Semiconductor Corporation (NS) has announced the introduction of two series of highly original LMETM audio operational amplifiers that are effective in solving distortion problems with a total harmonic distortion and noise (THD+N) of only 0.00003%. The two series of amplifiers themselves have extremely high linearity, so they achieve the lowest distortion rate. Manufacturers of high-end audio systems can use these two series of amplifier chips to produce an absolutely high-quality sound system, ensuring that the recording is as good as the master.National's 44V audio op amp family currently only has the LME49860 dual-assembled model, but the chip is available in two different packages, while the 34V series op amps have a single-package LME49710, dual-assembled LME49720, and four. A variety of different models, such as the assembled LME49740, are available. These newest amplifiers are part of National's high-performance audio product line with the award-winning 34V dual-package LM4562 high-end audio audio op amp. All of the above amplifiers offer high performance, are available in a variety of different packages, and operate over a wide voltage range (up to +/-22V). At the same time, National Semiconductor announced in another related press release the industry's first 200V single-chip audio power amplifier driver (LME49810) with built-in Baker clamp circuit.
National Semiconductor's high-performance audio op amps offer the advantages of extremely low distortion, very low noise, high speed and high output drive, making them ideal for audio/video receivers, preamplifiers and mixers, and home appliance automation. Distribution systems, speakers, monitors, and subwoofers. These op amps are also suitable for demanding non-audio systems, including ultrasound systems, test and measurement instruments, industrial automation equipment and security systems.
Whether audio performance or signal conditioning, both 34V and 44V audio op amps meet the stringent technical requirements of these important functions, such as input noise density as low as 2.7nV/sqrt Hz, 60Hz IF noise corner, and 600 Ohm output. drive. These op amps have a slew rate of 20V/us and a gain bandwidth of up to 55MHz, and performance is unaffected even when driving any load. These new operational amplifiers are the latest in National Semiconductor's high-performance audio signal conditioning and power amplifier portfolio and can be combined with the LM4702 and LME49810 power amplifier drivers to create a comprehensive audio signal path solution.
The LME49860 operates from a wide supply voltage range of +/-2.5V to +/-22V to ensure unity gain and output up to 26mA. As long as operating within this supply voltage range, the amplifier's common-mode rejection ratio (CMRR) and power-supply rejection ratio (PSRR) can be kept above 120dB, while the input bias current is as low as 10nA (typical). The LME49860 chip has an extremely wide dynamic range of audio, and with the support of the output stage, the voltage swing can be further increased. To drive a 2k-Ohm load, the voltage swing can be increased to within 1V of the supply voltage. With a load of 600 Ohm, the voltage swing can be increased to within 1.5V. Even with a capacitive load of up to 100pF, the LME49860 chip delivers exceptional performance. In addition, the chip also features protection against thermal shutdown and output short circuit. For packaging, the LME49860 is available in 8-lead narrow SOIC and DIP packages. The 44V single-packaged operational amplifiers are expected to be available in volume from the third quarter of 2007.
The LME49710, LME49720, and LME49740 amplifiers operate at a wide supply voltage range of +/-2.5V to +/-17V to ensure unity gain stability and output up to 45mA. For packaging, the LME49710 single-package amplifier and LME49720 dual-amplifier are available in 8-lead narrow SOIC, DIP and metal can TO-99 packages. The LME49740 quad-amplifier is available in 14-pin narrow SOIC and DIP packages.
The LME49860 dual-assembly chip is priced at $3.36 each. The LME49710 single-package chip is priced at $1.35 each, while the same chip in a metal can is priced at $6.92 each. The LME49720 dual-packaged chip is priced at $2.69 each, while the same chip in a metal can package costs $10.60 each. The LME49740 four-package chip is priced at $5.38 each. All chips are available in volume and purchased in 100 units.
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