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Quiet JFET features nearly zero popcorn noise

Posted: 17 Feb 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear integrated systems? lsk170? junction field-effect transistor? jfet?

Linear Integrated Systems Inc.'s LSK170 series of junction field-effect transistors (JFETs) provide low noise at both high and low frequencies with a narrow range of saturated drain current and low capacitance. The LSK170's low noise to capacitance ratio and narrow range of saturated drain current (IDSS) provide solutions for applications that can't tolerate high values of capacitance or wide ranges of IDSS. The LSK170 is specifically designed for low noise, high-input impedance applications within the audio, instrumentation, medical and sensors markets.

The LSK170 series features nearly zero popcorn noise, said John Hall, president of Linear Integrated Systems. "Utilizing large scale integrated circuit technology to build the LSK170 series allows LIS to achieve the goals of high transconductance, low noise and a low value of gate to drain capacitance," he said.

Applications include audio amplifiers and preamps, discrete low-noise operational amplifiers, battery-operated audio preamps, guitar pickups, effects pedals, microphones, audio mixer consoles, acoustic sensors, sonobuoys, hydrophones, chemical and radiation detectors, instrumentation amplifiers, accelerometers, CT scanners input stages, oscilloscope input stages, electrometers and vibrations detectors.

The LSK170 JFETs provide voltage noise of 1nV per Hz at 1kHz, 2nV per Hz at 10Hz typical and a high gain (22 miliSiemens), with 22pF of capacitance. The series is offered in three IDSS ranges: 2.6mA to 6mA, 6mA to 12mA and 10mA to 20mA.

The narrow ranges of IDSS binning with the LSK170 promote ease of design tolerancing, particularly in low voltage applications. The LSK170 is practical for portable battery operated applications, and features high breakdown voltage (BVDSS) for maximum linear headroom in high-transient-program content amplifiers. The series has a uniquely linear voltage gate-source (VGS) transfer function for stability.

The company's small-signal discrete product lines are specifically designed to service the new design and second-source requirements of customers in the audio, hybrid, medical, space, test and measurement markets. Linear Integrated Systems supplies pin for pin replacements for more than 2,000 discrete devices currently offered or discontinued by Interfet, Intersil, Micro Power Systems, Motorola, National, Fairchild, Toshiba and Siliconix-Vishay.

The LSK170 series is a pin for pin replacement of the Toshiba 2SK170 and improved functional replacement for the Interfet IF1320, IF1330, IF1331 and IF4500, according to Linear Integrated.

The LSK170 series devices are sampling now in SOT-23 and TO-92 packages. The company is guaranteeing short lead times with delivery from stock. Pricing is 50 cents each in 1,000-piece quantities.

- Bettyann Liotta


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