REF2025_15 Datasheet, PDF (21/32 Pages) Texas Instruments – REF20xx Low-Drift, Low-Power, Dual-Output, VREF and VREF / 2 Voltage References

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REF2025, REF2030, REF2033, REF2041
SBOS600B – MAY 2014 – REVISED JULY 2014
Typical Application (continued)
10.2.1.2.3 Voltage Reference
The voltage reference for this application should have the following features:
1. Dual output (3.0 V and 1.5 V),
2. Low drift, and
3. Low tracking errors between the two outputs.
For this design, the REF2030 is used. The REF20xx topology is as shown in the Functional Block Diagram
section.
The REF2030 is an excellent choice for this application because of its dual output. The temperature drift of
8 ppm/°C and initial accuracy of 0.05% make the errors resulting from the voltage reference minimal in this
application. In addition, there is minimal mismatch between the two outputs and both outputs track very well
across temperature, as shown in Figure 52 and Figure 53.
40
30
20
10
0
V_REF and V_BIAS Matching (ppm)
C004
Figure 52. V_REF – 2 × V_BIAS Distribution (At T_A = 25°C)
60
50
40
30
20
10
0
0
1
2
3
4
5
6
V_REF and V_BIAS Tracking Over Temperature (ppm/SC)
C016
Figure 53. Distribution of V_REF – 2 × V_BIAS Drift Tracking
Over Temperature
10.2.1.2.4 Results
Table 1 summarizes the measured results.
Table 1. Measured Results
ERROR
Error across the full load current range (25°C)
Error across the full load current range (–40°C to 125°C)
UNCALIBRATED (%)
±0.0355
±0.0522
CALIBRATED (%)
±0.004
±0.0606
Copyright © 2014, Texas Instruments Incorporated
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