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Fig.2 Block diagram of the bipolar TV/VTR-stereo decoder with fixed coil (alignment-free).

TDA9840

mute

LEVEL AND

STEREO

ADJUSTMENT

DIGITAL

PLL

OSCILLATOR

V

i 1

DIGITAL PLL

AND

DEMODULATOR

DIGITAL PLL

AND

DEMODULATOR

DIGITAL

INTEGRATOR

DIGITAL

INTEGRATOR

GENERATION

OF

REFERENCE

VOLTAGES

I C-BUS

CONTROL

2

CONTROL

LOGIC

1

20

SCL

SDA

11

12

13

14

MAIN

SCART

500 mV RMS

500 mV RMS

500 mV RMS

500 mV RMS

Ω

5 k

Ω

5 k

15

17

9

10

10 k

Ω

10 k

Ω

40 k

Ω

40 k

Ω

7

8

250 mV RMS

(from 1st SC)

2.2

µF

2.2

µF

27 k

Ω

180 pF

1.8 nF

±2%

4.7 mH

±5%

100 nF

10

µF

10 nF

5

4

2

3

25 k

Ω

25 k

Ω

V

ref

19

6

18

16

100

µF /

16 V

10 MHz

DUAL bit

STEREO

bit

L

R/B

250 mV RMS

L/A/MONO

250 mV RMS

2.2

µF

2.2

µF

500 mV RMS

250 mV RMS

(from 2nd SC)

C

AGC

C

LP

C

DCL

V

i 2

V

o 1

V

i 3

V

i 4

V

o 2

V

o 3

0 to 4.5 dB

stereo

level

V

P

C

ref

10 k

Ω

−2 dB

−2 dB

0 to 4.5 dB

10 k

Ω

0 to

−0.4 dB

A/MONO

6 dB

6 dB

6 dB

6 dB

Ω

25 k

Ω

25 k

Ω

25 k

Ω

25 k

POWER-ON

RESET

L+R

2

, A

R, B

10 nF

C

D1

±5%

10 nF

C

D2

±5%

Q

tan

δ

≤ 0.01

1/2 V

GND

XTAL

P

V

i pil

MBE458

Input and output levels are nominal values.

They are related to the SCART norm.

(AM: m = 0.54, FM:

∆f= ±27 kHz).

The components of the external LC band-pass filter have the

following order-No.:

Philips Germany only No: 4312 020 17525 or Fastron Sdn.

Bha., Malaysia type SMCC 472 J for L = 4.7 mHz (

±5%)

Philips Components No: 2222 429 71802, C = 1.8 nF (