Precision differential amplifier drives 20-bit ADCs, uses 2 mA

September 25, 2015 // By Graham Prophet
LTC6363 is a low power, high precision, fully differential amplifier intended for driving high performance 16-, 18- and 20-bit SAR and ΔΣ ADCs. With 100 µV maximum input offset voltage and 2.9 nV/√Hz input-referred voltage noise, the LTC6363 consumes 19 mW on a 10V supply.

It can convert single-ended signals to differential outputs or be used in a fully differential manner, settling an 8 VP-P differential output step to 18-bit resolution in 780 nsec. Four external resistors set the amplifier’s gain. The LT5400 family of highly matched quad resistors can be used to achieve excellent linearity. The LTC6363 is stable whether configured for unity gain, higher gain, or attenuation; it operates on a 2.8V to 11V supply, its outputs swing rail-to-rail and a VOCM pin sets the output common mode voltage for optimal matching to the input range of precision 20-bit SAR ADCs such as the LTC2378-20.

The LTC6363 is specified over the -40°C to 85°C and -40°C to 125°C temperature ranges, and is available in MSOP-8 and 2 x 3 mm DFN packages. Prices start at $2.49 (1,000).

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