APPLICATION CIRCUITS

DATA ACQUISITION

NEGATIVE REFERENCE VOLTAGE

ADS8326

REF5040

REF

V

OUT

GND

+IN

-

IN

V

IN

+5V

OPA365

Input

Signal

0Vto4V

+5V

+5V

V

DD

GND

C

BYPASS

1 F

m

R

1

50W

C

1

1.2nF

C

2

22 F

m

-

2.5V

+2.5V

+5V

NOTE:Bypasscapacitorsnotshown.

R

1

10kW

R

2

10kW

-

5V

OPA735

+5V

DNC

TEMP

V

OUT

V

IN

GND

DNC

NC

TRIM/NR

REF5025

1 F

m

REF5010

,, REF5020

REF5025, REF5030

REF5040, REF5045, REF5050

Data acquisition systems often require stable voltage

For applications requiring a negative and positive

references to maintain accuracy. The REF50xx family

reference voltage, the REF50xx and OPA735 can be

features low noise, very low drift, and high initial

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

accuracy

for

high-performance

data

converters.

supply. Figure 26 shows the REF5025 used to

Figure 27 shows the REF5040 in a basic data

provide a 2.5V supply reference voltage. The low drift

acquisition system.

performance of the REF50xx complements the low

offset voltage and zero drift of the OPA735 to provide

an accurate solution for split-supply applications.

Care must be taken to match the temperature

Figure 27. Basic Data Acquisition System

Figure 26. The REF5025 and OPA735 Create

Positive and Negative Reference Voltages

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Product Folder Link(s): REF5010 REF5020 REF5025 REF5030 REF5040 REF5045 REF5050