Analog Devices debuts fully differential amplifiers/ADC drivers
Norwood, MA. Analog Devices has announced the LTC6363-0.5, LTC6363-1, and LTC6363-2 precision, fixed-gain, fully differential amplifiers, creating a family of ultraprecision fixed-gain variants of the LTC6363 amplifier. The new offerings are available in fixed gains of 0.5, 1, and 2V/V to provide flexibility when scaling inputs to the full range of ADCs.
The precision resistors that are integrated in LTC6363-0.5, LTC6363-1, and LTC6363-2 have been designed with overall system performance in mind, striking a balance between noise and linearity and utilizing laser-trimmed factory calibration to achieve a level of precision that is difficult and costly to achieve discretely. Initial gain accuracy is 45 ppm maximum and varies by only 0.5 ppm/°C maximum over temperature. Common-mode rejection ratio, which is typically limited by discrete resistor matching, is 94 dB minimum, equivalent to a 0.002% resistor matching.
“One of the challenges when driving high-performance SAR ADCs is finding an appropriate driver that consumes comparable power while maintaining the noise and linearity performance of the ADC. This is where the LTC6363 family excels. For example, the LTC2378-20 20-bit SAR ADC consumes 21 mW at 1 MS/s,” said Maziar Tavakoli, design manager, Linear Products and Solutions. “The LTC6363 family’s noise and linearity have negligible impact on ADC performance while consuming a mere 19 mW, comparable to the ADC’s power consumption. Now with the LTC6363-0.5, LTC6363-1, and LTC6363-2 you can get this same ADC driving performance plus the added precision afforded by the precision integrated resistors, all in the same compact MSOP8 package.”
The entire LTC6363 family operates with supply voltages from 2.8 V (±1.4 V) to 11 V (±5.5 V) while drawing 1.75 mA typical supply current. The devices are specified for operation over a temperature range from –40°C to 125°C. The LTC6363 fixed-gain series are available in a 3-mm x 5-mm plastic MSOP8 package, and the LTC6363 (without resistors) is also offered in a 2-mm x 3-mm DFN package.