April 1985

2

Philips Semiconductors

Product specification

I.F. amplifier and demodulator for

multistandard TV receivers

TDA2549

GENERAL DESCRIPTION

The TDA2549 is a complete i.f. circuit with a.f.c., a.g.c., demodulation and video preamplification facilities for

multistandard television receivers. It is capable of handling positively and negatively modulated video signals in both

colour and black/white receivers.

Features

• Gain-controlled wide-band amplifier providing complete i.f. gain

• Synchronous demodulator for positive and negative modulation

• Video preamplifier with noise protection for negative modulation

• Auxiliary video input and output (75 Ω)

• Video switch to select between auxiliary video input signal and demodulated video signal

• A.F.C. circuit with on/off switch and inverter switch

• A.G.C. circuit for positive modulation (mean level) and negative modulation (noise gate)

• A.G.C. output for controlling MOSFET tuners

QUICK REFERENCE DATA

PACKAGE OUTLINE

24-lead DIL; plastic (SOT101A); SOT101-1; 1996 November 19.

Supply voltage (pins 13 and 21)

typ.

12

V

Supply current (pins 13 and 21)

typ.

82

mA

(between pins 6 and 7)

typ.

50

µV

(between pins 22 and 3)

positive modulation

typ.

2

V

negative modulation

typ.

4

V

Gain control range

typ.

74

dB

S/N

typ.

57

dB

A.F.C. output voltage swing (pin 15)

min.

10

V

Max. tuner a.g.c. output current

(pin 10)

min.

0,3

mA

Video bandwidth (3 dB)

B

typ.

5,5

MHz

Auxiliary video input voltage (pin 12)

typ.

1

V

Auxiliary video output impedance

(pin 14)

typ.

7

Ω

Auxiliary video output voltage

(pin 14)

typ.

2

V