1 Features
• Two outputs, VREF and VREF / 2, for convenient
use in single-supply systems
• Excellent temperature drift performance:
– 8 ppm/°C (maximum) from –40°C to 125°C
• High initial accuracy: ±0.05% (maximum)
• VREF and VBIAS tracking overtemperature:
– 6 ppm/°C (maximum) from –40°C to 85°C
– 7 ppm/°C (maximum) from –40°C to 125°C
• Microsize package: SOT23-5
• Low dropout voltage: 10 mV
• High output current: ±20 mA
• Low quiescent current: 360 μA
• Line regulation: 3 ppm/V
• Load regulation: 8 ppm/mA
• Matte-Sn version (REF2025AISDDCR) for
improved corrosion resistance in the Battelle Class
III and similar harsh environments

2 Applications
• Electricity meter
• Analog input module
• Analog output module
• Servo drive control module
• Circuit breaker (ACB, MCCB, VCB)
• Clinical digital thermometer
• Lab & field instrumentation
• Battery test

3 Description
Applications with only a positive supply voltage often
require additional stable voltage in the middle of
the analog-to-digital converter (ADC) input range to
bias input bipolar signals. The REF20xx provides a
reference voltage (VREF) for the ADC and a second
highly-accurate voltage (VBIAS) that can be used to
bias the input bipolar signals.
The REF20xx offers excellent temperature drift
(8 ppm/°C, maximum) and initial accuracy (0.05%)
on both the VREF and VBIAS outputs while operating
at a quiescent current less than 430 μA. In addition,
the VREF and VBIAS outputs track each other with
a precision of 6 ppm/°C (maximum) across the
temperature range of –40°C to 125°C. All these
features increase the precision of the signal chain and
decrease board space, while reducing the cost of the
system as compared to a discrete solution. Extremely
low dropout voltage of only 10 mV allows operation
from very low input voltages, which can be very useful
in battery-operated systems.
Both the VREF and VBIAS voltages have the same
excellent specifications and can sink and source
current equally well. Very good long-term stability and
low noise levels make these devices ideally-suited for
high-precision industrial applications.