March 1991

2

Philips Semiconductors

Product specification

Multistandard decoder

TDA4557

GENERAL DESCRIPTION

The TDA4557 is a monolithic integrated multistandard

colour decoder for the PAL, SECAM, NTSC 3.58 MHz and

NTSC 4.43 MHz standards.

FEATURES

Chrominance part

• Gain controlled chrominance amplifier for PAL, SECAM

and NTSC

• ACC rectifier circuits (PAL/NTSC, SECAM)

• Burst blanking (PAL) in front of 64 µs glass delay line

• Chrominance output stage for driving the 64 µs glass

delay line (PAL, SECAM)

• Limiter stages for direct and delayed SECAM signal

• SECAM permutator

Demodulator part

• Flyback blanking incorporated in the demodulators

(PAL, NTSC, SECAM)

• PAL switch

• Internal PAL matrix

• Two quadrature demodulators with external reference

tuned circuits (SECAM)

• Internal filtering of residual carrier

• De-emphasis (SECAM)

Identification part

• Automatic standard recognition by sequential inquiry

• Delay for colour-on and scanning-on

• Reliable SECAM identification by PAL priority circuit and

50/60 Hz recognition

• Forced switch-on of a standard

• Four switching voltages for chrominance filters, traps

and crystals

• Two identification circuits for PAL/SECAM (H/2) and

NTSC

• PAL/SECAM flip-flop

• SECAM identification mode switch (horizontal, vertical

or combined horizontal and vertical)

• Crystal oscillator with divider stages and PLL circuitry

(PAL, NTSC) for double colour subcarrier frequency

• HUE control (NTSC)

• Service switch

QUICK REFERENCE DATA

PACKAGE OUTLINE

28-lead DIL; plastic (SOT117); SOT117-1; 1996 November 27.

PARAMETER

SYMBOL

MIN.

TYP.

MAX.

UNIT

Supply voltage (pin 13)

10.8

12.0

13.2

V

Supply current (pin 13)

−

65

−

mA

Chrominance input voltage

(peak-to-peak value)

20

100

400

mV

Chrominance output voltage

(peak-to-peak value)

−

1.6

−

V

Colour difference output voltages

(peak-to-peak values)

−(R-Y)

−

1.05 V

± 2dB

−

V

−(B-Y)

−

1.33 V

± 2dB

−

V

Sandcastle pulse (pin 24)

Required amplitude to separate

vertical and horizontal pulse

2.0

2.5

3.0

V

horizontal pulse

4.1

4.5

4.9

V

burst gating pulse

7.7

−

V