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

SBOS456F

– SEPTEMBER 2008 – REVISED SEPTEMBER 2011

www.ti.com

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 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 5-V

accuracy

for

high-performance

data

converters.

supply. Figure 33 shows the REF5025 used to

Figure 34 shows the REF5040 in a basic data

provide a 2.5-V supply reference voltage. The low

acquisition system.

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 34. Basic Data Acquisition System

Figure 33. The REF5025 and OPA735 Create

Positive and Negative Reference Voltages

space

REVISION HISTORY

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision E (August 2011) to Revision F

Page

•

Added REF5045A top-side marking ..................................................................................................................................... 2

•

Added REF5045AQDRQ1 HBM ESD rating of 1000 V ........................................................................................................ 2

12

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