1

3

REF29xx

2

0.47µF

V

IN

V

OUT

15

REF2912, REF2920, REF2925

REF2930, REF2933, REF2940

www.ti.com

SBVS033C – JUNE 2002 – REVISED JUNE 2016

Product Folder Links: REF2912 REF2920 REF2925 REF2930 REF2933 REF2940

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Copyright © 2002–2016, Texas Instruments Incorporated

9 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. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

For normal operation, the REF29xx 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 REF2912 use a low-ESR

capacitance of 10 µF or less. Figure 29 shows the typical connections required for operation of the REF29xx. TI

always recommends a supply bypass capacitor of 0.47 µF.

Figure 29. Typical Connections for Operating REF29xx

9.2 Typical Application

Figure 30 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, operational amplifier circuit is used to attenuate and level-shift the input signal.