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

V

bout

47 F

1N4148

V

CC

IVLS

MIC1

MIC2

EAR-

EAR+

GREC

470nF

2k

Ω

2.2 F

300

Ω

15k

Ω

10k

Ω

1.3k

Ω

V

RE F

10 F

47

Ω

47nF

100 F

V

RING

BUZ

VMC

V

RE F

DTMF

V

RMC

SOFT

AGC

10 F

100nF

10 F

56 0k

Ω

100nF

V

CC

TEA7088A

3.9k

Ω

V

RE F

47 F

62 0

Ω

13V

1 F

82k

Ω

33

Ω

C2

4.7nF

1.6k

Ω

100nF

15k

Ω

S ide tone

V

CC

24V

V

thri

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

470nF

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

10 0nF

10 F

560k

Ω

10 0nF

V

CC

TEA7088A

3.9k

Ω

V

REF

47 F

620

Ω

13V

1 F

82k

Ω

33

Ω

C2

4.7nF

1.6k

Ω

100nF

I

RING

15k

Ω

S idetone

V

CC

V

bout

6 bit s e rial code (0111XX/Fi/010001) ; OS C IN = 1.79MHz e xterna l clock (de fa ult mode )

or 3.58MHz e xterna l ce ra mic/crysta l (with code ”101000” to s e lect internal os cillator)

TEA7088A

14/17