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Amplifier drives 2.5V, 3V SAR ADCs without a negative supply

Posted: 18 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? lt1994? differential amplifier? amplifier?

Linear Technology Corp. launched its latest fully differential amplifier for driving high-resolution analog-to-digital converters. With guaranteed operation down to 2.375V and rail-to-rail outputs, the LT1994 is touted to be the industry's only differential amplifier that can directly drive 2.5V and 3V SAR ADCs without the need of a negative supply. Achieving -94dBc harmonic distortion at 1MHz and an extremely low voltage noise of 3nV/vHz, this new product provides the widest dynamic range on the lowest supply voltages, added the company.

"The trend toward lower voltage, single supply high performance analog-to-digital converters has created the need for differential amplifiers that can operate on a common supply rail without compromising performance," said Erik Soule, GM of Linear Tech's signal conditioning product line. "The LT1994 addresses this need, providing customers with a true single supply solution for driving 16bit ADCs."

In addition to low noise and low distortion characteristics, the LT1994 is capable of sourcing and sinking up to 85mA. It draws approximately 14mA supply current and features a shutdown pin that reduces consumption to 300?A. Target use includes industrial, instrumentation and medical applications.

The LT1994 is specified for operation from 2.375V to 12.6V. Available in commercial and industrial temperature grades, it is offered in the MSOP-8 and DFN-8 packages. Pricing starts at $1.65 each in 1,000-piece quantities.

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