ADI has released LTC6363-0.5, LTC6363-1 and LTC6363-2 precision, fixed gain, fully differential amplifiers, thus producing the ultra-high precision fixed gain series of LTC6363 amplifiers. The new devices offer fixed gains of 0.5, 1, and 2V / V, providing flexibility when scaling the input to the entire ADC range.
The design of precision resistors integrated into the device takes into account the performance of the entire system, strikes a balance between noise and linearity, and uses laser trimmed factory calibration to obtain the level of accuracy, which is costly for challenging and discrete implementation . The initial gain accuracy is a maximum of 45 ppm, and the maximum change over the entire temperature range is only 0.5 ppm / C. Common mode rejection ratio is usually limited by discrete resistance matching, with a minimum of 94dB, which is equivalent to 0.002% resistance matching.
"One of the challenges in driving a high-performance SAR ADC is finding the right driver that consumes comparable power while maintaining the noise and linearity of the ADC. This is what makes the LTC6363 family stand out. For example, the LTC2378-20 20-bit SAR The ADC consumes 21mW at 1Msps, "said Maziar Tavakoli, design manager at Linear Products and Solutions. The noise and linearity of the LTC6363 series have negligible effects on ADC performance, and the power consumption is only 19mW, which is comparable to the ADC power consumption. Now with LTC6363-0.5, LTC6363-1 and LTC6363-2, you can get the same ADC drive performance in the same compact MSOP8 package and the higher accuracy provided by precision integrated resistors.
