REF2033AIDDCR Integrated Circuits (ICs)

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1. Description

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 (VREF) for the ADC and a second highly-accurate voltage (VBIAS) that can be used to bias the input bipolar signals. The REF20xx offers excellent temperature drift (8 ppm/°C, maximum) and initial accuracy (0.05%) 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 (maximum) across the temperature range of –40°C to 125°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.

2. Features

    1. Two outputs, VREF and VREF / 2, for convenient use in single-supply systems

    2. Excellent temperature drift performance:

        – 8 ppm/°C (maximum) from –40°C to 125°C

    3. High initial accuracy: ±0.05% (maximum)

    4. VREF and VBIAS tracking overtemperature:

        – 6 ppm/°C (maximum) from –40°C to 85°C

        – 7 ppm/°C (maximum) from –40°C to 125°C

    5. Microsize package: SOT23-5

    6. Low dropout voltage: 10 mV

    7. High output current: ±20 mA

    8. Low quiescent current: 360 μA

    9. Line regulation: 3 ppm/V

  10. Load regulation: 8 ppm/mA

  11. Matte-Sn version (REF2025AISDDCR) for improved corrosion resistance in the Battelle Class III and similar harsh environments

3. Applications

    1. Electricity meter

    2. Analog input module

    3. Analog output module

    4. Servo drive control module

    5. Circuit breaker (ACB, MCCB, VCB)

    6. Clinical digital thermometer

    7. Lab & field instrumentation

    8. Battery test

4. Pin Configuration

5. Pin Functions

6. Application Information

The low-drift, bidirectional, single-supply, low-side, current-sensing solution, described in this section, can accurately detect load currents from –2.5 A to 2.5 A. The linear range of the output is from 250 mV to 2.75 V. Positive current is represented by output voltages from 1.5 V to 2.75 V, whereas negative current is represented by output voltages from 250 mV to 1.5 V. The difference amplifier is the INA213 current-shunt monitor, whose supply and reference voltages are supplied by the low-drift REF2030.