GENERAL DESCRIPTION
The TDA4650 is a monolitic integrated multistandard colour decoder for PAL, SECAM and NTSC
(3.58 and 4.43 MHz) with negative colour difference output signals. The colour-difference output signals are fed to the TDA4660/TDA4661, Switched capacitor delay line.

FEATURES
Identifies and demodulates PAL, SECAM, NTSC 3.58 and NTSC 4.43 chrominance signals with:
• Identification
– automatic standard identification by sequential inquiry
– secure SECAM identification at 50 Hz only, with PAL priority
– four switched outputs for chrominance filter selection and display control
– external service switch for oscillator adjustment
• PAL / NTSC demodulation
– H (burst) and V blanking
– PAL switch (disabled for NTSC)
– NTSC phase shift (disabled for PAL)
– PLL-controlled reference oscillator
– two reference oscillator crystals on separate pins with automatic switching
– quadrature demodulator with subcarrier reference
• SECAM demodulation
– limiter-amplifier
– quadrature-demodulator with a single external reference tuned circuit
– alternate line blanking, H and V blanking
– de-emphasis
• Gain controlled chrominance amplifier
• ACC demodulation controlled by system scanning
• Internal colour-difference signal output filters to remove the residual subcarrier