TDA2521

      TDA2521 is a monolithic integrated circuit designed as a synchronous demodulator for PAL television receivers.It includes an 8.8 MHz oscillator and divider,to generate two 4.4 MHz referance signals,and provides color difference outputs.It is intended to interface directly with the TDA2521 with a minimum of external components and is constructed on a single silicon chip using the Fairchild Planar epitaxial process.Here you can get some information about the features.First,it has 8.8 MHz 8.8 MHz chroma subcarrier oscillator and divider,to generate two 4.4 MHz referance signals.The second one is the keyed phase comparator for optimum noise performance.Then is the chroma control and referance voltage.Next is the color killer and identification signals.The fourth one is the  temperature compensated emitter follower outputs.The fifth one is the on-chip capacitors to reduce carrier redidue.The sixth one is the color killed in demodulators during flyback.The seventh one is the pal flip-flop and switch.The last one is the vertical blanking in the output stages.
      What comes next is about the absolute maximum ratings of TDA2521.The supply voltage is 14 V.The internal power dissipation is 600 mW.The storage temperature is from -55 to 125.The operating temperature is from -20 to 60.The pin temperature (soldering 10 s) is 260.
      There are the eletrical charateristics about TDA2521 to follow (V+=12 V,TA=25).The typical supply current (I₁₂) is 40 mA.Then is about the color difference DC output voltage.The typical R-Y output (V₃) is 5.6 V.The typical G-Y output (V₂) is 5.6 V.The typical B-Y output (V₁) is 5.6 V.Next is about the color difference output voltage.The minimum R-Y output (V_3pk-pk) is 2.4 V_pk-pk.The typical G-Y output (V_2pk-pk) is 1.35 Vpk-pk.The typical B-Y output (V_1pk-pk) is 3.0 V_pk-pk.The minimum input resistance of chroma inputs (R5,R6) is 800 .The maximum input capacitance of chroma inputs (C5,C6) is 10 pF.The typical output resistance of color difference terminals (R1,R2,R3) is 250 .