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

-2V

+2V

+5V

NOTE: Bypass capacitors not shown.

R

1

10kW

R

2

10kW

-5V

OPA735

+5V

DNC

TEMP

V

OUT

V

IN

GND

DNC

NC

TRIM/NR

REF5020

1 F

m

REF5020-EP, REF5025-EP

REF5040-EP, REF5050-EP

SBOS471A – APRIL 2010 – REVISED JUNE 2010

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 27 shows the REF5020 used to

Figure 28 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 28. Basic Data Acquisition System

Figure 27. The REF5020 and OPA735 Create

Positive and Negative Reference Voltages

12

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