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Audio op amps offer 'lowest' distortion, 'highest' linearity

Posted: 25 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:amplifiers? audio op amps? bandwidth?


Two new op amp families for high-end audio applications from National Semiconductor set new standards for performance. The 17 V/34 V LME497xx (single, dual and quad versions available) family and the 22V/44V LME49860 dual device offer extremely low distortion, low noise, high speed and high output drive. High-performance devices are needed in audio systems, where the serial string of amplifiers in a signal path will contribute cumulative deficiencies, usually analyzed via worst-case or root-sum-square error budgets.

In addition to the 0.00003 percent THD+N (total harmonic distortion plus noise) specification , the op amps come with voltage noise of just 2.7nV/root-Hz and current noise of 1.2pA/root-Hz at 1kHz. Input bias current is also low, at 10nA. Output current is up to 26mA (44V devices) and 45mA (34V devices), and the amplifiers can handle 600#&937; loads. Gain bandwidth product of 55MHz, 1/f noise corner at 60Hz, and slew rate of 20V/?s round out the key specifications. PSRR and CMRR are 120dB.

These audio op amp families come in a variety of packages, including SOIC, DIP and metal can. Per-IC pricing ranges from $1.35 for the LME49710 single to $9.95 for the LME49720 in a metal can and $3.36 for the LME49860 (all in 100-piece orders).

- Bill Schweber
Planet Analog

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