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TDA8012M

Low power PLL FM demodulator for satellite TV receivers

Philips Electronics 

Philips Semiconductors

Low power PLL FM demodulator

for satellite TV receivers

Product specification

TDA8012M

PINNING

SYMBOL

CDF1

CDF2

PD(pos)

PD(neg)

IFI1

IFI2

GND

VCC

AGCO

AGCth

VIDEO

LF1

LF2

OSCGND

VCO1

VCO2

NF

KEY

AFCCDO

AFCos

PIN

DESCRIPTION

1 carrier detector filter 1 input

2 carrier detector filter 2 input

3 positive peak detector output

4 negative peak detector output

5 IF input 1

6 IF input 2

7 ground

8 supply voltage

9 AGC output

10 AGC threshold voltage input

11 baseband signal output

12 loop filter 1 input

13 loop filter 2 input

14 oscillator ground

15 oscillator tank circuit 1 input

16 oscillator tank circuit 2 input

17 noise filter input

18 key pulse input

19 AFC and carrier detector output

20 AFC offset input

ndbook, halfpage

CDF1 1

CDF2 2

20 AFCos

19 AFCCDO

PD(pos) 3

18 KEY

PD(neg) 4

17 NF

IFI1 5

16 VCO2

TDA8012M

IFI2 6

15 VCO1

GND 7

14 OSCGND

V CC 8

13 LF2

AGCO 9

12 LF1

AGC th 10

11 VIDEO

MBE250

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

The TDA8012M is a low power PLL FM demodulator

designed for use in satellite TV reception systems.

The demodulator is based on a Phase-Locked Loop (PLL)

structure including a fully balanced two-pin VCO. A high

gain IF amplifier ensures a high input sensitivity. The video

output voltage is supplied via a highly linear video buffer

which has a low output impedance. The centre frequency

of the VCO and the loop characteristics can be set using

external components.

The circuit provides an AGC signal which is used to drive

a gain-controlled IF amplifier (TDA8011T or TDA8010M)

to ensure a stable PLL demodulation characteristic.

An analog AFC voltage is also made available. This signal

can be suitably applied to the input of the ADC port of the

PLL frequency synthesizer (TSA5055). The AFC function

may be keyed to address D2MAC and MUSE systems.

The TDA8012M includes a Carrier Detector (CD) which is

used for channel detection during search procedures.

1996 Mar 26

4

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