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TDA9809

Single standard multimedia IF-PLL and FM radio demodulator

Philips Electronics 

Philips Semiconductors

Single standard multimedia IF-PLL and FM

radio demodulator

Preliminary specification

TDA9809M

PINNING

SYMBOL PIN

DESCRIPTION

ViVIF1

ViVIF2

LP0

1 VIF differential input signal voltage 1

2 VIF differential input signal voltage 2

3 logic port 0

ViRIF

CVAGC

TPLL

VoAF

LP2

4 RIF input

5 VIF AGC capacitor

6 PLL loop filter

7 audio output

8

logic port 2 and soft mute threshold

adjustment

CDEC

Vo(int)

ViFM

TAGC

9 decoupling capacitor

10 intercarrier output voltage

11 sound intercarrier input voltage

12 TV/radio tuner AGC output

Vo(vid)

AFC

13 composite video output voltage

14 AFC/RIF level output

VCO1

15 VCO1 resonance circuit

VCO2

16 VCO2 resonance circuit

GND

17 ground

CERRES 18 ceramic resonator 10.7 MHz

VP

TADJ

19 supply voltage

20 tuner AGC takeover point adjustment

handbook, halfpage

ViVIF1 1

ViVIF2 2

LP0 3

20 TADJ

19 VP

18 CERRES

ViRIF 4

17 GND

CVAGC 5

16 VCO2

TDA9809M

TPLL 6

15 VCO1

VoAF 7

14 AFC

LP2 8

13 Vo(vid)

CDEC 9

12 TAGC

Vo(int) 10

11 ViFM

MHA958

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

The TDA9809M is comprised of the functional blocks

shown in Fig.1:

• Vision IF amplifier and AGC detector

• Tuner (TV/radio) and VIF AGC

• Frequency Phase-Locked Loop (FPLL) detector

• VCO, Travelling Wave Divider (TWD) and TV AFC

• Video demodulator and amplifier

• Intercarrier mixer

• RIF amplifier and AGC detector

• FM-PLL demodulator, level detector and radio AFC

• Audio Frequency (AF) signal processing

• Internal voltage stabilizer

• Logic.

Vision IF amplifier and AGC detector

The vision IF amplifier contains three AC-coupled

differential amplifier stages. Each differential stage

includes a feedback network controlled by emitter

degeneration.

The AGC detector generates the required VIF gain control

voltage for constant video output by charging/discharging

the AGC capacitor. The sync level of the video signal is

therefore detected for negative video modulation.

Tuner (TV/radio) and VIF AGC

For TV operation, the AGC capacitor voltage is converted

to an internal IF control signal and then fed to the tuner

AGC to generate the tuner AGC output current at

pin TAGC (open-collector output). The tuner AGC

takeover point can be adjusted at pin TADJ. This allows

the tuner to be matched to the SAW filter in order to

achieve the optimum IF input level.

For FM radio operation, an AGC detector is provided to

obtain some adjacent channel protection.

1998 Jan 08

5

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