REF3212,REF3220

REF3225,REF3230

REF3233,REF3240

SBVS058 −JUNE 2005

www.ti.com

11

ADS7822

REF3233

V

CC

CS

D

OUT

DCLOCK

V

REF

+In

−In

GND

GND

V

IN

V

S

+

+

5

Ω

1

µFto 10µF

0.47

µF

1

µFto 10µF

0.1

µF

Microcontroller

V+

3.3V

21

3

5

64

Figure 6. Basic Data Acquisition System 1

ADS8324

REF3212

V

CC

CS

D

OUT

DCLOCK

V

REF

+In

−In

GND

GND

V

IN

+

+

5

Ω

1

µFto 10µF

1

µFto 10µF

0.1

µF

0V to 1.25V

V

Microcontroller

2.5V Supply

2.5V

1

2

34

5

6

Figure 7. Basic Data Acquisition System 2

ADS8381

REF3240

10

Ω

1k

Ω

1k

Ω

10

Ω

0.1

µF

1

µF

22

µF

V

V

REF

+5V

56

3

4

2

1

500

Ω

0.22

µF

THS4031

+5V

−5V

V

IN

6800pF

Figure 8. REF3240 Provides an Accurate Reference for Driving the ADS8381