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Series voltage references

REF1933

ACTIVE

3.3-V Vref, dual-output Vref & Vref/2 voltage reference

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Data sheet
3.3-V Vref, dual-output Vref & Vref/2 voltage reference

REF1933

ACTIVE
Data sheet Order now

Product details

VO (V) 3.3, 1.65 Initial accuracy (Max) (%) 0.1 Temp coeff (Max) (ppm/ degree C) 25 Vin (Min) (V) 3.32 Vin (Max) (V) 5.5 Iq (Typ) (uA) 360 Rating Catalog Features Multiple outputs, Enable pin Iout/Iz (Max) (mA) 20 Operating temperature range (C) -40 to 125 Shutdown current (ISD) (Typ) (uA) 3.3
VO (V) 3.3, 1.65 Initial accuracy (Max) (%) 0.1 Temp coeff (Max) (ppm/ degree C) 25 Vin (Min) (V) 3.32 Vin (Max) (V) 5.5 Iq (Typ) (uA) 360 Rating Catalog Features Multiple outputs, Enable pin Iout/Iz (Max) (mA) 20 Operating temperature range (C) -40 to 125 Shutdown current (ISD) (Typ) (uA) 3.3
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SOT-23-THN (DDC) 5 8 mm² 2.9 x 2.8
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  • Two Outputs, VREF and VREF / 2, for Convenient Use in Single-Supply Systems
  • Excellent Temperature Drift Performance:
    • 25 ppm/°C (max) from –40°C to 125°C
  • High Initial Accuracy: ±0.1% (max)
  • VREF and VBIAS Tracking over Temperature:
    • 6 ppm/°C (max) from –40°C to 85°C
    • 7 ppm/°C (max) from –40°C to 125°C
  • Microsize 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
  • Two Outputs, VREF and VREF / 2, for Convenient Use in Single-Supply Systems
  • Excellent Temperature Drift Performance:
    • 25 ppm/°C (max) from –40°C to 125°C
  • High Initial Accuracy: ±0.1% (max)
  • VREF and VBIAS Tracking over Temperature:
    • 6 ppm/°C (max) from –40°C to 85°C
    • 7 ppm/°C (max) from –40°C to 125°C
  • Microsize 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
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Applications with only a positive supply voltage often require an additional stable voltage in the middle of the analog-to-digital converter (ADC) input range to bias input bipolar signals. The REF19xx 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 REF19xx offers excellent temperature drift (25 ppm/°C, max) and initial accuracy (0.1%) 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 (max) across the temperature range of –40°C to 85°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.

Applications with only a positive supply voltage often require an additional stable voltage in the middle of the analog-to-digital converter (ADC) input range to bias input bipolar signals. The REF19xx 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 REF19xx offers excellent temperature drift (25 ppm/°C, max) and initial accuracy (0.1%) 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 (max) across the temperature range of –40°C to 85°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.

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REF2033 ACTIVE 3.3-V Vref, low-drift, low-power, dual-output Vref & Vref/2 voltage reference Offers lower temperature drift and initial accuracy on both VREF and VBIAS.

Technical documentation

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Type Title Date
* Data sheet REF19xx Low-Drift, Low-Power, Dual-Output, VREF and VREF / 2 Voltage References datasheet (Rev. A) 03 Jan 2017
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
User guide ADS7056EVM-PDK Quick Start Guide 09 Mar 2017

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