REF5025-HT datasheet(11/16 Pages) TI1

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ADS8326

REF5025

REF

OUT

GND

+IN

-IN

+5V

OPA365

Input

Signal

0V to 4V

+5V

GND

BYPASS

1 F

50W

1.2nF

22 F

2.5V

+2.5V

+5V

NOTE:Bypasscapacitorsnotshown.

10kW

OPA735

+5V

DNC

TEMP

OUT

GND

DNC

TRIM/NR

REF5025

1 F

REF5025-HT

www.ti.com

SBOS502D – SEPTEMBER 2009 – REVISED APRIL 2012

APPLICATION CIRCUITS

DATA ACQUISITION

NEGATIVE REFERENCE VOLTAGE

Data acquisition systems often require stable voltage

For applications requiring a negative and positive

references to maintain accuracy. The REF5025

reference voltage, the REF5025 and OPA735 can be

features low noise, very low drift, and high initial

used to provide a dual-supply reference from a 5-V

accuracy

for

high-performance

data

converters.

supply. Figure 29 shows the REF5025 used to

Figure 30 shows the REF5025 in a basic data

provide a 2.5-V supply reference voltage. The low

acquisition system.

drift performance of the REF5025 complements the

low offset voltage and zero drift of the OPA735 to

provide

accurate

solution

for

split-supply

applications. Care must be taken to match the

temperature coefficients of R1 and R2.

OPA365 and ADS8326 have not been

characterized or tested at 210°C.

Figure 30. Basic Data Acquisition System

OPA735 has not been characterized or

tested at 210°C.

Figure 29. The REF5025 and OPA735 Create

Positive and Negative Reference Voltages

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