8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

For normal operation, the REF30 does not require a capacitor on the output. If a capacitive load is connected,

take special care when using low equivalent series resistance (ESR) capacitors and high capacitance. This

precaution is especially true for low-output voltage devices; therefore, for the REF3012 use a low-ESR

capacitance of 10μF or less. Figure 8-1 shows the typical connections required for operation of the REF30.

A supply bypass capacitor of 0.1μF is always recommended.

V

OUT

V

IN

1

2

3

0.1μF

REF30

Figure 8-1. Typical Connections for Operating REF30

8.2 Typical Application

Figure 8-2 shows a low-power reference and conditioning circuit. This circuit attenuates and level-shifts a bipolar

input voltage within the proper input range of a single-supply low power 16-Bit ΔΣ ADC, such as the one inside

the MSP430 or other similar single-supply ADCs. Precision reference circuits are used to level-shift the input

signal, provide the ADC reference voltage and to create a well-regulated supply voltage for the low-power analog

circuitry. A low-power, zero-drift, op-amp circuit is used to attenuate and level-shift the input signal.

+

+

±

+

±

IN OUT

REF3012

IN

OUT

REF3030

3.3 V

R2

R1

1.25 V

20 k

R3

3.0 V

VOUT

20 k

OPA317

100 k

10 k

3.0 V

1.25 V

3.3 V

IN+

IN±

SD_16

J1.2/A1+

J1.3/A1±

J1.5/VREF

0.625 V

C2

47 µF

R6

47 k

R7

47 k

VIN

±5 V

R4

A-ADC

R5

3.0 V

MSP430F2013

Launchpad

100 k

Copyright © 2016, Texas Instruments Incorporated

Figure 8-2. Low-Power Reference and Bipolar Voltage Conditioning Circuit for Low-Power ADCs

REF30, REF30E

SBVS032J – MARCH 2002 – REVISED JULY 2025

www.ti.com

20

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Product Folder Links: REF30 REF30E