Philips Semiconductors
Product specification
TDA4555
TDA4556
Multistandard decoder
• Two quadrature demodulators with external reference
GENERAL DESCRIPTION
tuned circuits (SECAM)
The TDA4555 and TDA4556 are monolithic integrated
multistandard colour decoders for the PAL, SECAM,
NTSC 3,58 MHz and NTSC 4,43 MHz standards. The
difference between the TDA4555 and TDA4556 is the
polarity of the colour difference output signals (B-Y)
and (R-Y).
• Internal filtering of residual carrier
• De-emphasis (SECAM)
• Insertion of reference voltages as achromatic value
(SECAM) in the (B-Y) and (R-Y) colour difference output
stages (blanking)
Features
Chrominance part
Identification part
• Automatic standard recognition by sequential inquiry
• Delay for colour-on and scanning-on
• Gain controlled chrominance amplifier for PAL, SECAM
and NTSC
• Reliable SECAM identification by PAL priority circuit
• Forced switch-on of a standard
• ACC rectifier circuits (PAL/NTSC, SECAM)
• Burst blanking (PAL) in front of 64 µs glass delay line
• Four switching voltages for chrominance filters, traps
and crystals
• Chrominance output stage for driving the 64 µs glass
delay line (PAL, SECAM)
• Two identification circuits for PAL/SECAM (H/2) and
NTSC
• Limiter stages for direct and delayed SECAM signal
• SECAM permutator
• PAL/SECAM flip-flop
• SECAM identification mode switch (horizontal, vertical
Demodulator part
or combined horizontal and vertical)
• Flyback blanking incorporated in the two synchronous
demodulators (PAL, NTSC)
• Crystal oscillator with divider stages and PLL circuitry
(PAL, NTSC) for double colour subcarrier frequency
• PAL switch
• HUE control (NTSC)
• Service switch
• Internal PAL matrix
QUICK REFERENCE DATA
Supply voltage (pin 13)
VP = V13-9
IP = I13
typ.
12
65
V
Supply current (pin 13)
typ.
mA
mV
V
Chrominance input signal (peak-to-peak)
Chrominance output signal (peak-to-peak)
Colour difference output signals (peak-to-peak values)
TDA4555: −(R-Y); TDA4556: + (R-Y)
TDA4555: −(B-Y); TDA4556: + (B-Y)
Sandcastle pulse; required amplitude for
vertical and horizontal pulse separation
horizontal pulse separation
V15-9(p-p)
V12-9(p-p)
20 to 200
typ.
1,6
V1-9(p-p)
V3-9(p-p)
typ.
typ.
1,05 V ± 2 dB
1,33 V ± 2 dB
V24-9
V24-9
V24-9
typ.
typ.
typ.
2,5
4,5
7,7
V
V
V
burst gating
PACKAGE OUTLINE
28-lead DIL; plastic (SOT117); SOT 117-1; 1996 November 27.
November 1984
2
NXP [ NXP ]
