REF1933 Dual Output Vref and Vref/2 Voltage Reference | TI.com

REF1933
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Dual Output Vref and Vref/2 Voltage Reference

 

Description

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.

Features

  • 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

Parametrics

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Part number Order VO (V) Initial accuracy (Max) (%) Temp coeff (Max) (ppm/ degree C) Rating Operating temperature range (C) Iout/Iz (Max) (mA) Iq (Typ) (uA) Shutdown current (Typ) (uA) Iq (Max) (uA) Features Package Group Vin (Min) (V) Vin (Max) (V)
REF1933 Order now 3.3
1.65    
0.1     25     Catalog     -40 to 125     20     360     3.3     430     Multiple outputs
Enable pin    
SOT-23-THIN | 5     3.32     5.5    
REF1925 Order now 2.5
1.25    
0.1     25     Catalog     -40 to 125     20     360     3.3     430     Multiple outputs
Enable pin    
SOT-23-THIN | 5     2.52     5.5    
REF1930 Order now 3
1.5    
0.1     25     Catalog     -40 to 125     20     360     3.3     430     Multiple outputs
Enable pin    
SOT-23-THIN | 5     3.02     5.5    
REF1941 Order now 4.096
2.048    
0.1     25     Catalog     -40 to 125     20     360     3.3     430     Multiple outputs
Enable pin    
SOT-23-THIN | 5     4.116     5.5