• Two input stages, R, G, B and Y, −(R−Y), −(B−Y) with multiplexing.
The TDA8505 is a highly integrated SECAM encoding IC that is designed for use in all applications that require transformation of R, G and B signals or Y, U and V signals to a standard SECAM signal.
• Chrominance processing, highly integrated, includes vertical identification, low frequency premphasis and high frequency premphasis (anti-Cloche) and bandpass filter.
The specification of the input signals is fully compatible with those of the TDA8501 PAL/NTSC encoder.
• Fully controlled FM modulator which produces a signal in accordance with the SECAM standard without adjustments. • Two reference oscillators, one for D'R f0 (4.40625 MHz) and one for D'B f0 (4.250 MHz). These oscillators are tuned by PLL loop with the frequency of the line sync as reference. Crystal tuning, or tuning by external reference source, of the reference oscillators is possible. • Output stages, CVBS and separated Y + SYNC and CHROMA. For CVBS output, signal amplitude 2 V (p−p) nominal, thus only an external emitter follower is required for 75 Ω driving. • Sync separator circuit and pulse shaper, to generate the required pulses for the processing, line, frame, FH/2 and chrominance blanking. • A 3-level sandcastle pulse is generated for PAL/NTSC to SECAM transcoding. • FH/2 input for locking with another decoder. • Colour killing on the internal colour difference signals. • Internal bandgap reference. ORDERING INFORMATION PACKAGE TYPE NUMBER PINS TDA8505