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FCE481

LED

LED

LED

LED

C1

C4

C5

C2

C3

4.7 nF

4.7 nF

4.7 nF

1(28)

2(27)

3(26)

4(25)

5(24)

6(23)

W1

W3

W2

15 pF

15 pF

L4

UHFIN1

UHFIN2

VHFIN

RFGND

IFFIL1

IFFIL2

PVHFL

PVHFH

PUHF

FMST

CE/AS

DA

CP

Y1

VT

XTAL

VCC

VCC

IFOUT

CL

SW

R15

R16

R17

R18

D4

D5

D6

D7

7(22)

8(21)

9(20)

10(19)

11(18)

12(17)

13(16)

14(15)

15(14)

16(13)

17(12)

18(11)

19(10)

20(9)

21(8)

22(7)

23(6)

24(5)

25(4)

26(3)

27(2)

28(1)

CON4

CON3

CON1

open for 3-wire

for test purpose only

for test purpose only

for test

purpose only

VCC

01 02

02 01

03

03

04

04

05 06

R24

R22

TDA6502/2A

(TDA6503/3A)

R12

R14

R10

R9

R8

Ω

R5

R4

R3

R7

R2 27

Ω

R11

R13

R25

R26

TR1

BC847B

C27

10

µF

(16 V)

C26

10

µF

(16 V)

TR2

BC847B

68 k

Ω

1 k

Ω

LOCK/ADC

LOCK/ADC

J2

J3

C22

330 pF

C23

C21

C18 4.7 nF

C16

L1

L3

L5

L2

C10 1.2 pF

C11 1.2 pF

C13

C9 1.2 pF

C8 1.2 pF

C14

D3

D2

D1

C17

C6

C15

C12

27 pF

C19 4.7 nF

C20

100 nF

10 nF

18 pF

4.7 nF

2 pF

4.7 nF

VHF-LOW

VHF-HIGH

BA792

BB178

BB179

OSCGND

VHFOSCIB

UHFOSCIB1

UHFOSCIB2

UHFOSCOC1

UHFOSCOC2

VHFOSCOC

GND

J1

RIPPLE

6.8 k

Ω

22 k

Ω

22 k

Ω

22 k

Ω

3.9 k

Ω

3.9 k

Ω

22 k

Ω

12 k

Ω

2.2 k

Ω

330

Ω

R21

330

Ω

R19

330

Ω

R20

330

Ω

330

Ω

330

Ω

330

Ω

330

Ω

680

Ω

27

Ω

82 pF

2 pF

22 nF

10 k

Ω

Fig.19 Measurement circuit.

The pin numbers in brackets represent the TDA6503 and TDA6503A.