0

10

20

30

40

V

C004

0

10

20

30

40

50

60

0

1

2

3

4

5

6

V

C016

21

REF2025, REF2030, REF2033, REF2041

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SBOS600C – MAY 2014 – REVISED JANUARY 2017

Product Folder Links: REF2025 REF2030 REF2033 REF2041

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Copyright © 2014–2017, Texas Instruments Incorporated

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.

Over Temperature

10.2.1.2.4

Results

Table 1 summarizes the measured results.

Table 1. Measured Results

ERROR

UNCALIBRATED (%)

CALIBRATED (%)

Error across the full load current range (25°C)

±0.0355

±0.004

Error across the full load current range (–40°C to 125°C)

±0.0522

±0.0606