The MAX6225BCSA+T from Analog Devices is a low-noise precision voltage reference. It is a three-voltage resistor-network-based reference that provides +2.5V, +4.096V, and +5V voltages. It features very low temperature-sensitivity error, drift, and noise. This part features 0.15ppm/°C temperature coefficient, 0.02ppm/V rated line regulation, 1.3µV/V max proportional temperature error, and 1.3µV RMS noise. The device is offered in an 8-pin DIP, an 8-terminal SOIC, or an 8-terminal space-saving UDFN. It is well suited for portable instrument and communications systems, and 5V reference replacement applications.