7.2.3 2.5V Reference on 1μA

0.1 F

μ

3V

R

LOAD

V

OUT = 2.5V

0.1 F

μ

R

SET

Figure 7-3. 2.5V Reference on 1μA

7.2.3.1 Design Requirements

Create a 2.5V reference that consumes 1µA of IREF.

7.2.3.2 Detailed Design Procedure

Figure 7-3 shows the REF1112 used as a 2.5V reference on 1μA. This is done by stacking the REF1112 in

series.

VOUT = 2 × VREF

(1)

where

• VREF is the reference voltage

In this case, VOUT = 2 × 1.25V = 2.5V

The IBIAS is still 1µA because the stacked REF1112 are in series.

7.2.4 Adjustable Voltage Shunt Reference

For applications requiring a stable voltage reference capable of sinking higher than 5mA of current, a REF1112

combined with an OPA347 can sink up to 10mA of current. This configuration is shown in Figure 7-4, and

through appropriate selection of R1 and R2, can be used to provide a wide range of stable reference voltages.

I

BIAS

2.5V

1.25V

0.1 F

μ

10k

Ω

R

1

10k

Ω

R

2

10k

Ω

OPA347

0.01 F

μ

V

OUT = 1.25 (1 + R1 / R2)

V

S

R

SET

Copyright © 2018, Texas Instruments Incorporated

Figure 7-4. Adjustable Voltage Shunt Reference

REF1112

SBOS283E – SEPTEMBER 2003 – REVISED DECEMBER 2024

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