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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | REF20xx Low-Drift, Low-Power, Dual-Output, VREF and VREF / 2 Voltage References datasheet (Rev. E) | PDF | HTML | 03 Feb 2022 |
| Application note | Voltage Reference Design Tips For ADC Pairing (Rev. A) | PDF | HTML | 02 Jun 2021 | |
| E-book | Tips and tricks for designing with voltage references (Rev. A) | 07 May 2021 | ||
| White paper | Simplifying Signal Chain Design for High Performance in Small Systems | 22 Oct 2020 | ||
| Application note | Precision Current Sources and Sinks Using Voltage References | 30 Jun 2020 | ||
| Application note | Voltage Reference Solutions in Motor Control Drives | 29 Jul 2019 | ||
| E-book | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | 28 Jun 2019 | ||
| White paper | Voltage reference selection basics white paper (Rev. A) | 23 Oct 2018 | ||
| Application note | Low-Cost, Low-Power, Small 14-bit AFE: Interleaved ADCs Scalable up to 7.5 MSPS | 26 May 2017 |
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