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AN629 - Digitally Adjustable Voltage References

Features

  • Output Voltage 2.048V 2.500V 4.096V MAX5462 32T, 100 Kilohms 5% 7% 11% MAX5401 256T, 100 Kilohms 0.6% 0.8% 1.3% MAX5160 32T, 50 Kilohms, Two Resistors 0.5% 0.5% 0.5% MAX5415 256T, 100 Kilohms, Dual 0.06% 0.03% 0.08% 5.000V 16% 1.6% 0.5% 0.2% The initial accuracy, adjustment range, and long-term drift requirements for the system must be considered when choosing a circuit topology. The low wiper resistance, the low end-to-end resistor tempco, and the very low ratiometric tempco specification.

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Full PDF Text Transcription

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DIGITAL POTENTIOMETERS Jul 01, 2001 Digitally Adjustable Voltage References A digitally adjustable voltage reference is useful in many applications. For instance, it can be used to finely tune the reference voltage when absolute accuracy is required or to adjust the reference voltage to match the full-scale voltage range of an analog-input signal to maximize the dynamic range of an analog-to-digital conversion. You can easily create one by combining an adjustable voltage reference with a digital potentiometer (pot). Using the digitally variable aspect of the digital pot to control the adjustment voltage on the reference results in a flexible and useful circuit. Three basic circuit topologies are presented here.
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