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This design is a typical application of LT6657 precision voltage reference IC of Linear Technology for precision measurements. It is used to produce a low noise precision 20-Bit Analog-to-Digital Converter (ADC) that offers unmatched noise performance (SINAD, SNR and SFDR), low power consumption and small package size. The LT6657 is a precision voltage reference that combines robust operating characteristics with extremely low drift and low noise. With advanced curvature compensation, this bandgap reference achieves 1.5ppm/°C drift with predictable temperature behavior, and an initial voltage accuracy of 0.1%. It also offers 0.5ppmP-P noise and very low temperature cycling hysteresis. Read more