TDA2522/TDA2523 National Semiconductor TV Circuits TDA2522/TDA2523 Color Demodulation Combinations General Description The TOA2522/TDA2523 are integrated synchronous demodulator combinations for colour television receivers incorporating the following features. Features 8.8 MHz oscillator followed by a divider giving two 4.4 MHz signals used as reference signals Keyed burst phase comparison for optimum noise behavior ACC detector and amplifier A color kitler . Two synchronous demodulators for the (B-Y) and (R-Y) signals Temperature compensated emitter follower outputs PAL switch and PAL flip-flop with internal identifi- cation . Integrated capacitors in the symmetrical demodu- lators reduce unwanted carrier-signals at the outputs Connection Diagram Dual-in-Line Package 1 16 MULLER DELAY 1TOR 1 8 YOUTPUT a9 capacity 1 6-voureur = HS samocastie purse fy output 4 Le Ace CAPACITOR (2) 2 ace ov 2 p= ACC CAPACITOR Li) a CHO mang % O- CHAOMA IF 4 Dual-in-Line Package. Order Number TDA2522 See NS Peckage NIEA Quad-in-Line Package, Order Number TDA26220 See NS Package N16C RY CHROMA we ut SUPPLY osc Looe Fi TeA Le ose ron Dual-in-Line Package, Order Number TDA2523: OSC LOOP FILTER q osc roan See NS Package Quad-In-Line Package, Order Number TDA25230 vores See NS Package N16C Block Diagram 1 5 besser PUT (BY) if -E F DEMODULATOR BLANKING | WPyT iA-) } ] Leite Ls oP ae Gt 1 1 furor oemonu u TOR a ALANRING ee oh} 1 BURST GATING AND Li a CLANKING PULSE Ha 1DENT CUAREAT , 7 e wa SAMPLING OETECTON PAL Vage (8-9) 2 ACC AMPLIFIER Santee oa I wr KILLER & 7 Toansz7 YaeriR-y) $31 } oc L__ A PMASE DETECTOR: > Oscitaton Cam 2 prrecton QUAST GATE (0 0 Moa) we enact 8 n 7 18 ' 4 " CO OuA MER SUNTLH Om co > atc - ab oh NOTE: The outputs of the TDA2522 are (B-Y), [| (R-Y) and ~(G-Y). The outputs of the TDA2523 are (8-Y}, (R-Y) and (G-Y}. 11-76 Absolute Maximum Ratings V114, Supply Voltage 14V ProT. Total Power Dissipation (Note 3) 600 mw TSTG. Storage Temperature -20C to +125C Ta, Operating Ambient Temperature -20C to +60C Electrical Characteristics v1i4 = 12v, Ta = 25C eeseva Licescval PARAMETER MIN Tye MAX UNITS Supply Current 40 mA Demodulator Section vi-4 Ratio of Demodulator Signals B-Y/R-Y, -- 1.78 V3-4 ovin-y,274% (Note 1) 0.85 V3-4" V2-4 GYIRY, a (Note 2) 0.17 Cotor Difference Output Signals, Peak-to-Peak Values R-Y, V34 (p-p) 2.40 Vv G-Y, V2-4 (p-p) 1.35 Vv B-Y, V1-4 (p-p) 3.00 Vv Impedance of Color Difference Signal Outputs |23~4| 250 Q \Z2-4| 250 2 iZ21-4| 250 Q H/2 Ripple at R-Y Output (Peak-to-Peak Value) 10 mv v15-4 Burst Keying Pulse (Positive-Going) 15 Vv Chrominance Input Signal (Including Burst) Peak-to-Peak Value R-Y, V64 500 mV B-Y, V5-4 350 mV Reference Section , Phase Difference Between Reference Burst Signals | 5 5 Deg. for 400 Hz Deviation of Crystal Frequency : Holding Range with Typical Crystal +500 Hz V12--4 ACC Reference Voltage 7 Vv ACC Voltage with 0.5V Peak-to-Peak Burst vi4--4 At Correct Phase 5.5 Vv v14-4 With Zero Burst 70 Vv ra vi3-4 ACC Amplifier Qutput with 0.5V Peak-to-Peak 1.5 Vv Burst of Correct Phase RG-F Oscillator Input Resistance 270 Nn RH_-F Oscitlator Output Resistance 200 Q Note 1: The demodulators are driven by & chrominance signal of equal amplitude for the (R-) and the (8-Y) components. The phase of the {R-Y) chrominence signal equals the phase of the (R-V} reference signal. The same holds for the (8-Y) signals. Note 2: As under note 1, but the phase of the (A-Y) reference signat reversed. Note 3: For operation in ambient temperatures above 25C, the device must be derated based on a 150C maximum junction temperature and 6 thermal resistence of 175 C/W junction to ambient. 11-77