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.
● 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
