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 64µs glass delay line
• Chrominance output stage for driving the 64µs 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)