REF2033AIDDCT

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 (V_REF) for the ADC and a second highly-accurate voltage (V_BlAS) that can be used to bias the input bipolar signals. The REF20xx offers excellent temperature drift (8 ppm/℃, max) and initial accuracy (0.05%) on both the VREF and V_BlAS outputs while operating at a quiescent current less than 430 μA. In addition, the V_REF and V_BIAS outputs track each other with a precision of 6 ppm/℃ (max) across the temperature range of -40℃ to 85℃. 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 V_REF and V_BlAS 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.

Applications

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

Key features

• Two Outputs, VREF and VREF / 2, for Convenient Use in Single-Supply Systems
• Excellent Temperature Drift Performance: – 8 ppm/°C (max) from -40°C to 125°C
• High Initial Accuracy: ±0.05% (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