1 Features
1• Two Outputs, VREF and VREF / 2, for Convenient
Use in Single-Supply Systems
• Excellent Temperature Drift Performance:
– 25 ppm/°C (max) from –40°C to 125°C
• High Initial Accuracy: ±0.1% (max)
• VREF and VBIAS Tracking over Temperature:
– 6 ppm/°C (max) from –40°C to 85°C
– 7 ppm/°C (max) 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

2 Applications
• Digital Signal Processing:
– Power Inverters
– Motor Controls
• Current Sensing
• Industrial Process Controls
• Medical Equipment
• Data Acquisition Systems
• Single-Supply Systems

3 Description
Applications with only a positive supply voltage often
require an additional stable voltage in the middle of
the analog-to-digital converter (ADC) input range to
bias input bipolar signals. The REF19xx 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 REF19xx offers excellent temperature drift
(25 ppm/°C, max) and initial accuracy (0.1%) 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 (max) across the temperature
range of –40°C to 85°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.