1996 Nov 20

3

Philips Semiconductors

Product specification

Multistandard/dual channel TV FM

intercarrier sound demodulator

TDA9820

BLOCK DIAGRAM

Fig.1 Block diagram.

(1) Resistor and potentiometer between capacitor and earth are inserted if adjustment of stereo channel separation is required.

handbook, full pagewidth

TDA9820

V =

4.5 to 8.8 V

P

(1)

CONTROL

UNIT

7-STAGE

LIMITER

AMPLIFIER 1

VCO 1

7-STAGE

LIMITER

AMPLIFIER 2

VCO 2

optional stereo

channel separation

adjustment

standard

switch

mute

intercarrier

SUPPLY

11

12

14

13

15

16

1

3

2

10

MHA420

9

+

−

7

+

−

6

5

8

4.5 MHz (M)

5.5 MHz (B/G)

6.0 MHz (I)

6.5 MHz (D/K)

4.72 MHz (M)

5.74 MHz (B/G)

6.74 MHz (D/K)

or

or

(1)

Rs

Rpot