3-214

TELCOM SEMICONDUCTOR, INC.

3-1/2 DIGIT ANALOG-TO-DIGITAL

CONVERTERS WITH HOLD

TC7116

TC7116A

TC7117

TC7117A

TYPICAL APPLICATIONS

Figure 13. Circuit for Developing Underrange and Overrange

Signals from TC7116/TC7116A Outputs

Figure 12. TC7117/TC7117A Internal Reference (200 mV Full Scale,

3 RPS, V

–

100 k

Ω

100 pF

0.47 µF

47 k

Ω

0.22 µF

TO DISPLAY

TO BACKPLANE

0.1 pF

21

1 k

Ω

22 k

Ω

9V

SET VREF= 100 mV

TC7116

TC7116A

0.01 µF

+

IN

1 M

Ω

–

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

+

–

21

20

40

35

26

TO

LOGIC

GND

–

V

TO

LOGIC

VCC

+

V

CD4077

U/R

O/R

CD4023

OR 74C10

TC7116

TC7116A

O/R = OVERRANGE

U/R = UNDERRANGE

100 pF

0.47 µF

47 k

Ω

TO DISPLAY

0.1 pF

1 k

Ω

Ω

V

SET VREF= 100 mV

+

10 k

10 k

Ω

1.2V

0.01 µF

–

IN

1 M

Ω

+

100 k

Ω

V

–

0.22 µF

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

TC9491CZM

TC7117

TC7117A

100 k

Ω

100 pF

0.47 µF

47 k

Ω

0.22 µF

TO DISPLAY

0.1 pF

21

1 k

Ω

22 k

Ω

SET VREF = 100 mV

0.01 µF

+

IN

1 M

Ω

–

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

–5V

+5V

TC7117

TC7117A

Figure 11. TC7116/TC7116A Using the Internal Reference

(200 mV Full Scale, 3 Readings Per Second (RPS)

Figure 14. TC7117/TC7117A With a 1.2V External Band-Gap

Reference (V

–