
478
Using the Analog Devices’ XFET® reference
15.4 Using the Analog Devices’ XFET
®
reference
As discussed in Chapter 14, the XFET
®
is an outstanding voltage reference with many
excellent features, including low cost. Most noticeable are its ultra-low noise level, a
very low initial accuracy (±0.05%, B-grade devices), low quiescent current (less than
800 µA), a very flat 3 ppm/°C tempco, and a wider operating temperature range (
auto-
motive
, –40°C to +125°C), than most bandgaps or buried-zener types. Its tempco is
flat and linear compared to either the bandgap or buried-zener, and its long-term drift
is better than most other types of reference. Because ...