REF1933AIDDCT

Applications with only a positive supply voltage typically require an additional stable voltage positioned at the midpoint of the ADC input range to bias bipolar input signals. The REF19xx provides a reference voltage (V_REF) for use with an ADC and a precision voltage (V_BLAS) for biasing bipolar input signals. The REF19xx features excellent temperature drift (25 ppm/°C maximum) and initial accuracy (0.1%) on both the V_REF and V_BLAS outputs, while maintaining quiescent current below 430 μA. Additionally, the V_REF and V_BLAS outputs track each other to 6 ppm/°C (maximum) over a temperature range of -40°C to 85°C. All these features improve signal chain accuracy, save board space, and reduce system cost compared to discrete solutions. An ultra-low dropout voltage of only 10 mV allows the device to operate at very low input voltages, making it well suited for battery-powered systems. The V_REF and V_BLAS voltages share equally impressive specifications, with equally strong current sourcing and sinking capabilities. These devices offer excellent long-term stability and low noise levels, making them ideal for high-precision industrial applications.

Applications

• Digital signal processing
• Power inverters
• Motor control
• Current sensing
• Industrial process control
• Medical equipment
• Data acquisition systems
• Single-supply systems

Key features

• Dual outputs, V_REF and V_REF/2, for easy use in single-supply systems
• Excellent temperature drift performance: 25 ppm/°C (max) over -40°C to 125°C
• High initial accuracy: ±0.1% (max)
• V_REF and V_BLAS tracking over temperature: 6 ppm/°C (max) from -40°C to 85°C; 7 ppm/°C (max) from -40°C to 125°C
• Compact 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