REF1933AIDDCR

Features for the REF1933

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

Description for the REF1933

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.