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    Voltage References

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    This learning module is an introduction to voltage references, covering fundamentals in measurement parameters, types, and applications.

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    Voltage Reference IC

     

    MAX6033AAUT41#TG16 - High-Precision, Low-Dropout SOT23 Series Voltage Reference

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    The MAX6033 ultra-high-precision series voltage reference features a low 7ppm/°C (max) temperature coefficient and a low dropout voltage (200mV, max). Low temperature drift and low noise make the MAX6033 ideal for use with high-resolution ADCs or DACs.

    Ultra-Low Temperature Drift: 7ppm/°C (max)

    ±0.04% Initial Accuracy

    Stable with Capacitive Loads

    Low 16µVP-P Noise (0.1Hz to 10Hz) (2.5V Output)

    15mA Output Source Current

    Low 200mV Dropout Voltage

    Low 40µA Quiescent Current

    Wide 2.7V to 12.6V Supply Voltage

     

    LM4040AEM3-2.5+T- Improved Precision Micropower Shunt Voltage Reference with Multiple Reverse Breakdown Voltages

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    The LM4040 is a precision two-terminal shunt mode, bandgap voltage reference available in fixed reverse breakdown voltages of 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V. Well suited for space-critical applications, the LM4040 is offered in the subminiature 3-pin SC70 surface-mount package (1.8mm x 1.8mm), 50% smaller than comparable devices in SOT23 surface-mount packages (SOT23 versions are also available).

    0.1% (max) Initial Accuracy

    100ppm/°C (max) Temperature Coefficient Guaranteed over -40°C to +125°C Temperature Range

    Wide Operating Current Range: 60µA to 15mA

    Low 28µVRMS Output Noise (10Hz to 10kHz)

    2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V Fixed Reverse Breakdown Voltages

    No Output Capacitors Required

    Tolerates Capacitive Loads

     

    MAX6126AASA41+ - Ultra-High-Precision, Ultra-Low-Noise, Series Voltage Reference

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    The MAX6126 is an ultra-low-noise, high-precision, low-dropout voltage reference. It features curvature-correction circuitry and high-stability, laser-trimmed, thin-film resistors that result in 3ppm/°C (max) temperature coefficients and an excellent ±0.02% (max) initial accuracy. The proprietary low-noise reference architecture produces a low flicker noise of 1.3µVP-P and wideband noise as low as 60nV/√Hz (2.048V output) without the increased supply current usually found in low-noise references. It improves wideband noise to 35nV/√Hz and AC power-supply rejection by adding a 0.1µF capacitor at the noise reduction pin.

    Ultra-Low 1.3µVP-P Noise (0.1Hz to 10Hz, 2.048V Output)

    Ultra-Low 3ppm/°C (max) Temperature Coefficient

    ±0.02% (max) Initial Accuracy

    Wide (VOUT + 200mV) to 12.6V Supply Voltage Range

    Low 200mV (max) Dropout Voltage

    380µA Quiescent Supply Current

    10mA Sink/Source-Current Capability

    Stable with CLOAD = 0.1µF to 10µF

     

    MAX6035BAUR25+T - High-Supply-Voltage, Precision Voltage Reference in SOT23

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    The MAX6035 is a high-voltage, precision micropower voltage reference. This three-terminal device is available with output voltage options of 2.5V, 3.0V, and 5.0V. It is an excellent upgrade for industry-standard devices such as the REF02 and REF43. The MAX6035 offers 14x lower power than the REF02 and 5x lower power than the REF43, as well as a reduced package size from an 8-pin SO to a 3-pin SOT23. The MAX6035 features a proprietary temperature coefficient curvature-correction circuit and laser-trimmed, thin-film resistors that result in a very low temperature-coefficient of 25ppm/°C (max) and an initial accuracy of ±0.2% (max).

    Wide Supply Voltage Range: Up to 33V

    25ppm/°C (max) Temperature Coefficient (-40°C to +85°C)

    ±0.2% (max) Initial Accuracy

    95µA (max) Quiescent Supply Current

    10mA Source Current, 2mA Sink Current

    No Output Capacitor Required

    Stable with Capacitive Loads up to 5µF

     

    LM4050AEM3-3.0+T -50ppm/°C Precision Micropower Shunt Voltage References with Multiple Reverse Breakdown Voltages

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    The LM4050 is a precision two-terminal, shunt mode, bandgap voltage reference available in fixed reverse breakdown voltages of 1.225V, 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V. Ideal for space-critical applications, the LM4050 is offered in the subminiature 3-pin SC70 surface-mount package (1.8mm x 1.8mm), 50% smaller than comparable devices in SOT23 surface-mount package (SOT23 versions are also available).

    50ppm/°C (max) Temperature Coefficient Guaranteed over the -40°C to +125°C Temperature Range

    Ultra-Small 3-Pin SC70 Package

    0.1% (max) Initial Accuracy

    Wide Operating Current Range: 60µA to 15mA

    Low 28µVRMS Output Noise (10Hz to 10kHz)

    1.225V, 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V Fixed Reverse Breakdown Voltages

    No Output Capacitors Required

    Tolerates Capacitive Loads

     

    MAX6006AEUR+T - 1µA SOT23 Precision Shunt Voltage Reference

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    The MAX6006 is an ultra-low-power shunt reference. It is offered in 3-pin SOT23 packages, and the minimum operating current is guaranteed to be < 1µA. The device features a low-temperature coefficient of < 30ppm/°C and initial accuracy of better than 0.2%.

    Ultra-Low Operating Current: Guaranteed < 1µA

    Small 3-Pin SOT23 Package

    Initial Voltage Accuracy: 0.2%

    Temperature Coefficient: 30ppm/°C max

    Temperature Range: -40°C to +85°C

    Factory-Trimmed Output Voltages: +1.25V, +2.048V, +2.5V, +3.0V

    Wide Operating Range: 1µA to 2mA

    AEC-Q100 (MAX6008AEUR/V+ Only)

     

    MAX6138CEXR21+T - 0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages

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    The MAX6138 is a precision, two-terminal shunt mode, bandgap voltage reference available in fixed reverse breakdown voltages of 1.2205V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V, and 5.0V. It is offered in the subminiature 3-pin SC70 surface-mount package (1.8mm x 1.8mm), 50% smaller than comparable devices in SOT23 surface-mount packages.

    Ultra-Small 3-Pin SC70 Package

    0.1% (max) Initial Accuracy

    25ppm/°C (max) Temperature Coefficient Guaranteed Over -40°C to +85°C Temperature Range

    Wide Operating Current Range: 60µA to 15mA

    Low 28µVRMS Output Noise (10Hz to 10kHz)

    1.2205V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V, and 5.0V Fixed Reverse Breakdown Voltages

    10mA Sink/Source-Current Capability

    Stable with CLOAD = 0.1µF to 10µF

     

    MAX6029EUK50+T- Ultra-Low-Power Precision Series Voltage Reference

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    The MAX6029 is a micropower, low-dropout, bandgap voltage reference that combines ultra-low supply current and low drift in a miniature 5-pin SOT23 surface-mount package. It uses 70% less board space than comparable devices in an SO package. Initial accuracy of 0.15% and a 30ppm/°C (max) temperature coefficient make the MAX6029 suitable for precision applications. This series-mode voltage reference sources up to 4mA and sinks up to 1mA of load current. A wide 2.5V to 12.6V supply range, ultra-low 5.25µA (max) supply current, and a low 200mV dropout voltage make these devices ideal for battery-operated systems. Additionally, an internal compensation capacitor eliminates the need for an external compensation capacitor and ensures stability with load capacitances up to 10µF.

    Ultra-Low 5.25µA (max) Supply Current

    ±0.15% (max) Initial Accuracy

    30ppm/°C (max) Temperature Coefficient

    4mA Output Source Current

    1mA Output Sink Current

    2.5V to 12.6V Supply Range

    Low 200mV Dropout

    Stable with Capacitive Loads Up to 10µF

     

    MAX6043BAUT33#TG16- Precision High-Voltage Reference in SOT23

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    The MAX6043 precision voltage reference provides accurate preset +2.5V, +3.3V, +4.096V, +5.0V, and +10V reference voltages from up to +40V input voltages. The MAX6043 features a proprietary temperature coefficient curvature-correction circuit and laser-trimmed thin-film resistors that result in a very low temperature-coefficient of 15ppm/°C (max) and excellent initial accuracy of 0.05% (max). Low-temperature drift and low noise make the MAX6043 ideal for use with high-resolution A/D or D/A converters.

    +2.5V, +3.3V, +4.096V, +5.0V, or +10V Output Voltages

    Excellent Temperature Stability: 15ppm/°C (max)

    Tight Initial Accuracy: 0.05% (max)

    Tiny SOT23 Package

    Wide +4.5V to +40V Supply Voltage Range

    Low Noise: 4µVP-P (typ at 2.5V Output)

    Short-Circuit Protected

    Wide Operating Temperature Range -40°C to +125°C

     

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