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Linear Tech op amp exhibits -85dB harmonic distortion

Posted: 19 Jul 2002 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? lt1819? operational amplifier? op amp? voltage feedback amplifier?

The LT1819 unity gain, voltage feedback op amp from Linear Technology Corp. provides a total harmonic distortion of -85dB (5MHz, 2Vpp), gain bandwidth product of 400MHz, and slew rate of 2.5kV/5s, making the device suitable for use in high-speed filters, ADC drivers, and DAC buffers, as well as high-end video and wireless base station amplifiers.

The 8-lead SOIC device also features 6nV/sqrt (10kHz) noise, 1.5mA maximum input offset voltage, and a guaranteed minimum output current of 50mA.

"The LT1819 is considerably faster than the majority of Current Feedback Amplifiers (CFAs) on the market. However, the LT1819 has the added advantage of utilizing the easier to use voltage feedback architecture," said Bill Jett, design manager of the group that developed the LT1819.

"As a result, applications of the LT1819 are not limited by problems associated with a CFA's low impedance negative input. This significantly simplifies the design of fast buffers, lowpass filters and band pass filters for example," he added.

Specified for operation from 4V to 12V (16V), the device's input common mode range extends to within 1.5V of the supplies, while the outputs drive a 500-ohm load to at least 1.2V from the supply rails.

The LT1819 is available with temperature specifications of 00C to 700C or -400C to 850C, and is priced at $2.80 each in 1,000-piece quantities.

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