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

REF5020-Q1, REF5025-Q1, REF5030-Q1

REF5040-Q1, REF5045-Q1, REF5050-Q1

www.ti.com

SBOS456G – SEPTEMBER 2008 – REVISED OCTOBER 2013

APPLICATION CIRCUITS

NEGATIVE REFERENCE VOLTAGE

For applications requiring a negative and positive reference voltage, the REF50xx and OPA735 can be used to

provide a dual-supply reference from a 5-V supply. Figure 30 shows the REF5025 used to provide a 2.5-V supply

reference voltage. The low drift 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

Figure 30. The REF5025 and OPA735 Create Positive and Negative Reference Voltages

DATA ACQUISITION

Data acquisition systems often require stable voltage references to maintain accuracy. The REF50xx family

features low noise, very low drift, and high initial accuracy for high-performance data converters. Figure 31

shows the REF5040 in a basic data acquisition system.

Figure 31. Basic Data Acquisition System

Copyright © 2008–2013, Texas Instruments Incorporated

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