Driving 16-bit ADCs

Linear Technology has announced the release of the LT1994, the latest fully differential amplifier for driving high-resolution analogue-to-digital converters.


Linear Technology Corporation

has announced the release of the LT1994, the latest fully differential amplifier for driving high-resolution analogue-to-digital converters.

With guaranteed operation down to 2.375V and rail-to-rail outputs, it is said 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, Linear Technology says the LT1994 provides the widest dynamic range on the lowest supply voltages.

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

Suited for driving 14-bit to 16-bit ADCs such as the LTC1403A-1 and LTC1867L, the LT1994 is reportedly an ‘excellent choice’ for general-purpose differential signal amplification, level shifting, single-ended to differential conversion and differential line driver/receiver applications in industrial, instrumentation and medical applications.

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 300uA. 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.