REF4132

+

±

OPA735

+5 V

+5 V

-5 V

-2.5 V

+2.5 V

EN

VIN

VREF

GND

R

1

10 NŸ

R

2

10 NŸ

13

REF4132

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SNAS794A – JUNE 2020 – REVISED JUNE 2020

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9.4 Device Functional Modes

9.4.1

EN Pin

When the EN pin (ENABLE PIN) of the REF4132 is pulled high, the device is in active mode. The device must be

in active mode for normal operation. The REF4132 can be placed in shutdown 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 2.5 µA in shutdown mode. The EN pin must not be pulled higher than VIN supply voltage.

See the Specifications for logic high and logic low voltage levels.

9.4.2 Negative Reference Voltage

For applications requiring a negative and positive reference voltage, the REF4132 and OPA735 can be used to

provide a dual-supply reference from a 5-V supply. Figure 19 shows the REF4132 used to provide a 2.5-V supply

reference voltage. The low drift performance of the REF4132 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 19. REF4132 and OPA735 Create Positive and Negative Reference Voltages