Fully differential ADC driver

10 August 2005 Analogue, Mixed Signal, LSI

The LT1994 is Linear Technology's latest fully differential amplifier for driving high-resolution analog-to-digital converters. With guaranteed operation down to 2,375 V and rail-to-rail outputs, it is the industry's only differential amplifier that can directly drive 2,5 V and 3 V SAR ADCs without the need of a negative supply, says the manufacturer. Achieving -94 dBc harmonic distortion at 1 MHz and an extremely low voltage noise of 3 nV/vHz, the LT1994 provides the wide dynamic range on low supply voltages.

Ideally suited for driving 14-bit to 16-bit ADCs such as the LTC1403A-1 and LTC1867L, the LT1994 is a good 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 85 mA. It draws approximately 14 mA supply current and features a shutdown pin that reduces consumption to 300 μA. It is specified for operation from 2,375 V to 12,6 V and offered in MSOP-8 and DFN-8 packages.

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