TCA650 ETC | Alldatasheet
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FOR SECAM OR PAL/SECAM DECODERS The TCA650 is an integrated synchronous demodulator for both the SECAM and PAL chrominance signals. Switching of the standard is performed internally, controlled by an external applied d.c. signal. In addition to the synchronous demodulator, which delivers colour difference signals, the circuit also incorporates: ~ a PAL matrix, used for adding the delayed and non-delayed signals to obtain separately the (R-Y) and (B-Y) components of the chrominance signal. ~ a PAL switch, which reverses the phase of the (R-Y) component of the chrominance signal on alternating lines. - a SECAM switch, which performs the separation of the Dg and Dg components of the chrominance signal by switching the delayed and non-delayed signals. - a SECAM limiter. QUICK REFERENCE DATA Supply voltage V14-2 nom. Rv Supply current lq nom, 36 mA . PAL SECAM Chrominance input signals - (peak-to-peak value) ye? typ. 50 200 mv V3-2(p-p) System switch input V4-2 typ. 12 ov = Colour difference output signals —_ = (peak-to-peak value) (RY Vy2-2@-p) ty? Li ov => @-Y): Vyo-2p-p) P-L. Reference input signals (PAL) (peak-to-peak value) ¥o-26-p) | tp ly 7-2(p-p) Square-wave input (peak-to-peak value) V16-2(p-p) typ 3 Vv PACKAGE OUTLINE 16-lead DIL; plastic (SOT-38). January 1980 14-1
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RATINGS Limiting values in accordance with the Absolute Maximum System (IEC 134) Voltage Supply voltage Vis-2 max. 13,2 V Power dissipation ‘Total power dissipation Prot max. 510 mW ‘Temperatures Storage temperature Tog -25to +125 °C Operating ambient temperature Tamb -25to +65 °C) CHARACTERISTICS measured in the circuit on page 6 Supply volta v ‘YP. aev Supply voltage. 14-2 10,2 to 13.2 V Required input signals at V}4- = 12 V and Tay, = 25°C Chrominance input signal peak-to-peak value Vi-2(p-p) | PAL 35 to 73 mV V3-2(p-p) | SECAM 150 to 400. mV Input impedance iZ1-al | 1,202.6 ko 123-2 i PAL matrix Gain from both inputs to pin 13 2,3 to 3,3 Gain from both inputs to pin 15 2,6 to 3,6 Gain difference from line-to-line < 5% Phase errors from line-to-line in the (R-Y) output for zero error in the (B-Y) output < 2,5° Output impedance {213-2| \\ < 100 Q = [2 15-2) = SECAM permutator = _Diaphotie < -46 GB Output signal (peak-to-peak value) Y13-26-p) | 1,6) t02,2. V 15-2(p-p) Output impedance 1213-2] \\ < 100 2 1215-21 1) when a stabilized power supply of £12 V is applied, Tamb is max. 75 °C. y ‘ami 2) at an input voltage of 0, 15 V; at an input voltage > 0,2 V the figure is 1,7 V. ee
4 April 1974
CHARACTERISTICS (continued) Demodulator Chrominance input signal amplitude PAL: (B-Y); peak-to-peak value Vo-2(p-p) typ. 0,22 V (R-Y); peak-to-peak value Vi1-2(p-p) typ. 0,28 V Ve SECAM: eak-to-peak value 9-2(p-p) | 1,5to3 V P pe V11-2(p-p) J 29.2 | Input impedance 29-2 } > 1 kQ purimpe [2 11-2) Reference input signal amplitude PAL: peak-to-peak value ¥6-200-p) \\ 0,5tols Vv 7-2(p-p) SECAM: peak-to-peak value 5-20") | 0,18 to15 Vv 8-2(p-p) 25-21; 27-2) Input impedance 125-21 0,75 to 1,25 kQ me [26-21 |Zg-a1 Colour difference output signal (R-Y); peak-to-peak value V2-2(p-p) 0,99 to 1,21 V2) (B-Y); peak-to-peak value V10-2(p-p) 1,32 to 1,62 Vy IZ 10-2! Output impedance | } 2,4t04,2 kO [212-21 Diaphotie at SECAM operation Diaphotie of the total circuit at frequencies corresponding to saturated green Dp = 4,72 MHz and Dp = 4,04 MHz < -40 4B Square wave input = peak-to-peak value V16-2(p-p) 2,5t03,5 V = Input impedance 216-2] > 3,8 kQ — System switch input 9) PAL: 7toViy V SECAM: Otol V }) Limiting starts at the quoted value. 2) The peak-to-peak clipping level for PAL is about 4,7 V for (B-Y) and 3 V for (R-Y). The discriminator characteristic allows a maximum peak-to-peak output signal of 3,6 V for (B-Y) and 2, 4 V for (R-Y) (SECAM). 3) ‘The switching signal is applied to pin 4 via a resistor of 2,7 k@ (10%). April 1974 | 3
APPLICATION INFORMATION
amplitude +n " u paral L_| 4I0F sal) | a a wal] setting 47kE 4 nF ne anal] ane One Aone: rt gsi undelayed signal delayed signal system RY ev setting 7 input input, swith a Pinning 1. Chrominance input 9. Chrominance (B-Y), Dg input 2. Earth (negative supply) 10. Colour difference (B-Y) output 3. Chrominance input 11, Chrominance (R-Y), Dp input 4, System switch input 12. Colour difference (R-Y) output 5. Reference (R-Y) input SECAM 13, Chrominance (R-Y), Dp output 6. Reference (R-Y) input PAL 14, Supply voltage (12 V) 7. Reference (B-Y) input PAL 15. Chrominance (B-Y) , Dg output 8. Reference (B-Y) input SECAM 16. Square wave input
6 September 1976
APPLICATION INFORMATION (continued) The function is quoted against the corresponding pin number 1. Chrominance input The blanked composite chrominance signal from pin 1 of the TCA640 is applied to this input via a resistive divider. 2. Negative supply (earth) 3. Chrominance input The blanked composite chrominance signal from pin 15 of the TCA640 is applied to this input via a delay-line, which has a delay time of 64 ys. 4. System switch input ‘The control voltage for switching the standard is applied to this input via a resistor of 2,7 k (+ 10%). A decoupling capacitor of at least 10 nF is recommended, Between
7 V and the supply voltage the circuit operates in the PAL mode, whereas between
0 V and 1 V the mode SECAM is selected. 5. Reference input for the (R-Y) demodulator The SECAM reference signal is applied to this pin. ‘The reference signal is obtained from pin 11 via a tank circuit. The tank circuit is tuned such that the level at the (R-Y) output (pin 12) during black (fg = 4, 4 MHz) equals the level during blanking (no signal). The output voltage amplitude at pin 12 can be adjusted by damping the tank circuit. 6. Reference input for the (R-Y) demodulator A PAL reference signal having (R-Y) phase is applied to this pin. 7. Reference input for the (B-Y) demodulator A PAL reference signal having (B-Y) phase is applied to this pin. 8. Reference inputfor the (B-Y) demodulator The SECAM reference signal is applied to this pin. The reference signal is obtained = from pin 15 via a tank circuit. The tank circuit is tuned such that the level at the = (B-Y) output (pin 10) during black (fg = 4, 25 MHz) equals the level during blanking (no = signal). The output voltage amplitude at pin 10 can be adjusted by damping the tank circuit. 9. Chrominance input to the (B-Y), Dg demodulator ‘The output signal of pin 15 is applied via a coupling capacitor of 4,7 nF. 10. Output of the (B-Y) demodulator The output signal of the balance demodulator contains an r.f. ripple of twice the chrominance frequency to be filtered by a 7 filter. At SECAM the required de~ emphasis circuit should be applied. 11. Chrominance input to the (R-Y), Dg demodulator ‘The output signal of pin 13 is applied via a coupling capacitor of 4,7 nF. April 1974 | 7
APPLICATION INFORMATION | (continued) 12, Output of the (R-Y) demodulator See pin 10. 13. Chrominance (R-Y), DR output ‘The (R-Y) component of the chrominance signal (Dg component at SECAM) is present at this pin. The signal is applied to the input of the (R-Y) demodulator (pin 11) and to the tank circuit for the SECAM reference signal. The emitter follower output should be loaded with a 2,7 k resistor to obtain an output impedance of <100 &. 14. Supply voltage (12 V) Correct operation occurs within the range 10,2 to 13,2 V. ‘The power dissipation must not exceed 510 mW at 65 OC ambient temperature. 15. Chrominance (B-Y), Dg output ‘The (B-Y) component of the chrominance signal (Dg component at SECAM) is present at this pin. ‘The signal is applied to the input of the (B-Y) demodulator (pin 9) and to the tank circuit for the SECAM reference signal. ‘The emitter follower output should be loaded with a 2,7 kS resistor to obtain an output impedance of <100 Q. 16. Square wave input ‘A square wave with an amplitude of 3 V drives the PAL switch or the SECAM permutator. The square wave is available at pin 12 of the TCA640.