TI REF2025AIDDCR

Applications with only a positive supply voltage typically require an additional stable voltage positioned at the midpoint of the ADC input range to bias the input bipolar signal. The REF20xx provides a reference voltage (VREF) for use by the ADC and a high-precision voltage (VBIAS) for biasing the input bipolar signal.

The REF20xx features excellent temperature drift (8ppm/°C maximum) and initial accuracy (0.05%) at both the VREF and VBIAS outputs, while maintaining quiescent current below 430μA. Furthermore, the VREF and VBIAS outputs track each other across the −40°C to 125°C temperature range with 6ppm/°C accuracy (maximum). Combined, these characteristics enable the REF20xx to improve signal chain accuracy, reduce board space, and lower system cost compared to discrete solutions. An ultra-low dropout of only 10mV allows the device to operate at very low input voltages, making it well suited for battery-powered systems.

The VREF and VBIAS voltages share equally impressive specifications, with strong sink and source current capability. These devices offer excellent long-term stability and low noise levels, making them ideal for high-precision industrial applications.

• Dual outputs, VREF and VREF/2, optimized for single-supply systems
• Excellent temperature drift: 8ppm/°C (max) over –40°C to 125°C
• High initial accuracy: ±0.05% (max)
• VREF and V_B|AS tracking over temperature:
  • 6ppm/°C (max) over –40°C to 85°C
  • 7ppm/°C (max) over –40°C to 125°C
• Compact package: SOT 23-5
• Low dropout: 10mV
• High output current: ±20mA
• Low quiescent current: 360μA
• Line regulation: 3ppm/V
• Load regulation: 8ppm/mA
• Matte-Sn version (REF2025AISDDCR) with improved corrosion resistance in Battelle Class III and similarly harsh environments

• Electricity meters
• Analog input modules
• Analog output modules
• Servo drive control modules
• Circuit breakers (ACB, MCCB, VCB)
• Clinical digital thermometers
• Laboratory and field instruments
• Battery testing