-2.5 V

+2.5 V

+5 V

1

2

5

6

3

4

R

1

10 kΩ R

2

10 kΩ

-5 V

+5 V

OPA735

REF3425

Copyright © 2017, Texas Instruments Incorporated

16

REF3425

SBAS804 – SEPTEMBER 2017

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Product Folder Links: REF3425

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Copyright © 2017, Texas Instruments Incorporated

8.4 Device Functional Modes

8.4.1

EN Pin

When the EN pin of the REF3425 is pulled high, the device is in active mode. The device must be in active mode

for normal operation. The REF3425 can be placed in a low-power mode by pulling the ENABLE pin low. When in

shutdown mode, the output of the device becomes high impedance and the quiescent current of the device

reduces to 2 µA in shutdown mode. The EN pin must not be pulled higher than VIN supply voltage. See the

Thermal Information for logic high and logic low voltage levels.

8.4.2 Negative Reference Voltage

For applications requiring a negative and positive reference voltage, the REF3425 and OPA735 can be used to

provide a dual-supply reference from a 5-V supply. Figure 27 shows the REF3425 used to provide a 2.5-V supply

reference voltage. The low drift performance of the REF3425 complements the low offset voltage and zero drift of

the OPA735 to provide an accurate solution for split-supply applications. Take care to match the temperature

coefficients of R1 and R2.

Figure 27. REF3425 and OPA735 Create Positive and Negative Reference Voltages