REF3230 datasheet(11/21 Pages) TI2

11 / 21 page

-2.5V

+2.5V

+5V

10kW

-5V

+5V

OPA735

REF3225

ADS7822

REF3233

OUT

DCLOCK

REF

+In

-In

GND

1mFto10mF

0.47 F

1 Fto10 F

0.1 F

Microcontroller

V+

3.3V

REF3212, REF3220

REF3225, REF3230

REF3233, REF3240

www.ti.com

SBVS058C

– JUNE 2005 – REVISED AUGUST 2011

APPLICATION CIRCUITS

NEGATIVE REFERENCE VOLTAGE

For applications requiring a negative and positive

reference voltage, the REF32xx and OPA735 can be

used to provide a dual-supply reference from a

±5V

supply. Figure 25 shows the REF3225 used to

provide a

±2.5V supply reference voltage. The low

drift performance of the REF32xx 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.

DATA ACQUISITION

Data acquisition systems often require stable voltage

references to maintain accuracy. The REF32xx family

features stability and a wide range of voltages

NOTE:: Bypass capacitor is not shown.

suitable

for

most

microcontrollers

and

data

converters. Figure 26, Figure 27, and Figure 28 show

Figure 25. REF3225 Combined with OPA735 to

basic data acquisition systems.

Create Positive and Negative Reference Voltages

Figure 26. Basic Data Acquisition System 1

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