7

GTR

1

23

4

5

6

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

I

LS

47 F

1N4148

V

CC

IVLS

MIC1

MIC2

EAR-

EAR+

GREC

470n F

2k

Ω

2.2 F

300

Ω

15k

Ω

10k

Ω

1.3k

Ω

V

REF

10 F

47

Ω

47nF

100 F

V

RING

BUZ

V

MC

V

REF

DTMF

V

RMC

SOFT

AGC

10 F

100nF

10 F

560k

Ω

100nF

V

CC

TEA7088A

3.9k

Ω

V

REF

47 F

620

Ω

13V

1 F

82 k

Ω

33

Ω

C2

4.7nF

1.6k

Ω

100 nF

60 0

Ω

10 0 F

I

L

15k

Ω

S idetone

V

CC

6 bit s e rial code (00XXXX/Fi/010010) ; OS C IN = 1.79MHz e xterna l clock (d e fault mode )

or 3.5 8MHz e xterna l ce ra m ic/crysta l (with co de ”101 000” to s e le ct interna l o s cillator)

Figure 17 : Test 6 (DTMF)

TEA7088A

15/17