Analogue, Mixed Signal, LSI


Fully differential amplifier

11 July 2012 Analogue, Mixed Signal, LSI

Linear Technology’s LTC6362 is a low-power, fully differential amplifier that can drive high-precision 16- and 18-bit SAR ADCs at only 1 mA supply current. With 200 µV maximum input offset voltage and 3,9 nV/√Hz input-referred noise, it is well suited for precision industrial and data acquisition applications.

The IC has an output common-mode pin with a 0,5 V to 4,5 V range, and 18-bit settling time of 550 ns with an 8 VP-P output step, making it ideal for driving ADCs such as the LTC2379-18 in multiplexed input and control loop applications.

This 18-bit SAR ADC features digital gain compression, which sets its full-scale input range to 10% to 90% of the reference voltage. Together with the rail-to-rail output stage of the LTC6362, this feature eliminates the need for a negative supply rail, simplifying the circuit and minimising power consumption.

The flexible architecture of the LTC6362 can convert single-ended DC-coupled, ground-referenced signals to differential, or DC level shift differential input signals. Its low input bias current, low offset voltage and rail-to-rail inputs also enable the device’s use in a high-impedance configuration to interface directly to sensors early in the signal chain.

The LTC6362 is available in MSOP-8 and 3 x 3 mm DFN packages, with fully guaranteed specifications over the 0°C to 70°C, -40°C to 85°C and -40°C to


125°C temperature ranges.



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