TBA560C ETC1
Document overview
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Technical content
LUMINANCE AND CHROMINANCE CONTROL COMBINATION The TBASGOC is an integrated circuit for colour television receivers incorporating circuits for the processing and conteol of the luminance and chrominance signals. 1t ‘can be used in conjunction with the TBA520 or TBA9SO, . Fs ' 30, 540, 550 and TCA8OO integrated circuits. loans ion The luminance pat provides luminance delay line sccommasrcontnoe p tessciecamonasnrer matching, DC contrast control, black level clamp circuit, coneasce wor sp Acar brightness control and flyback blanking raceseoes caer cametor Of rgqggqe "Pp cenomastronaranconnn: The chrominance part provides chroma amplification counanes irs G "Pw retorceroncomons tant, with ACC, DC chroma gain control which tracks with the smmommess conta, a contrast control, separate saturation control, burst gate, osteo Gr pi trae ano camara chroma signal flyback blanking colour killer and PAL delay fermen nmenc enctons Ge 2p cwsouncurnn line driver. The TBASEOC is not an equivalent of the TBASOO and ons 510 although it performs similar functions to those circuits Fig. 1 Pin connections ABSOLUTE MAXIMUM RATINGS QUICK REFERENCE DATA Voltages are catered to pin 16 - @_ Supply Voitage (Nom.) (V11.16) 12V ® Supply Current (Nom.) (1) 1) 30mA vom ote in ny Luminance Signal Input Current (Typ) Vo 010 #12V (note 2) Viz 510 +8 (I3(p.p)) 0.4mA Va O10 +6V via 3 to +8.5¥ (note 2) ® Luminance Output Signal at Nominat Ve 010 +3V Vyamin -8V Contrast Setting (Typ.) and Input Current as Ve 5 to +5V Vis Oto +8v Above (V5.16ip-p}) 1V (See Note 1) ‘Currents (positive when flowing into the integrated circuit) B@ Chrominance Input — Signal. (Min) 4 Oto +1mA by “10 to. Om (V1.15(p-p)) 4mV ty =1t0 +3mA, Iyomax +3mA. > Chrominance Input Signa! (Max.) V1.15{9-p)) ts -5 10 Oma Kamax 41m 80mv 's stortmA yg Oto tm I Chrominance Output Signal at Nominal V smas Tatton dsspa Contrast and Saturation Setting (Typ) " Tame * 60°C (note 1) 580m 'V9.16(p:p)) 1V (See Note 1) Temperature BH Contrast Control Range > 20d8 i secwense Saturation Controi Range >20d8 orage temperature 88°C 10 +1 an ‘Operating ambient temperature “0°C t6 +80°C o Burst Output (Closed ACC Loop) (Typ! 7-16(p-p)) 1V Notet 1. Permissible during receiver switch on transient Vy ymax. 16V. Proymax. 700m for > 60sec
2 Vp and V3 man always be lower than Vay
a or ee $3 i ed ae T | reawee |i : Ly t- sua i eat | | « te Fig. 2 TBAS6OC block diagram
ELECTRICAL CHARACTERISTICS
Test Conditions (unless otherwise stated): Voc = +12V, Tamb = +25°C test circuit = Fig. 6, voltages referred to pin 16 [a te. [| Supply voltage, Vee wf toe} 12 | 32] v Required Input Signals Chrominance input signal, p-p value of colour bars with 75% saturation, Vi.15 [1.15 | 4 80 | mv po) Luminance input current, black-to-white | 3 o4 | 15 |mApo| Contrast control voltage range for 20dB control 2 2 | 37 | 56 | Vv |Seenote 1 and Fig 3 Brightness control voltage for black level of 1.5V at O/P 6 13 V_|See note 2 and Fig. 4 Saturation control voltage range 20dB contro! 13 | 27 | 44 | 62 | Vv |Seenote 1 and Fig 5 Flyback blanking pulse amplitude 8 for OV blanking level at pin § o | -05 | -1 | vpk for 1.5V blanking level at pin 5 -2 | -25 | -3 | vpk Burst keying (back porch) pulse {ve going) 10 | 0.05 3 | mApk Colour killer 13 | 05 1 v ‘Automatic chrominance control starting level (ve going) 14 12 V_ |See note 3 ‘Obtainable Output Signals Luminance output voltage (black-to-white}] 5 1 3 | Vo |i =0.4mA pp, V2 =3.7V Black level shitt 100 | mv |See notes 1 and 4 Burst signal amplitude 7 1 Vpp Chrominance signal at nominal contrast and saturation 9 1 V pep |See note 1 3B bandwidth of chrominance and luminance amplifier 5 MHz Change of ratio of luminance to chrominance 2 | dB [Contrast contro! 1048 Notes, 1 Nominal contrast or saturation * maximum value ~6dB. Thus, the control s #6 10 ~ 1408 on the nermina 2. When Vg ssinereaaed to above 1.7V, the Black level of the outout signal remains at 2.7 3 Arnegative-going potential provides a 2608 ACC range with negligible signal distortion. Maximum gain reduction is obtained at an input voltage of SO0mV min 4. Black level shift is specified as that due to changes of contrast and video content at constant brightness setting 218
FUNCTIONAL DESCRIPTION 8. Flyback Blanking Input Waveform 1. Balanced Chroma Signal Input (in conjunction with Negative going horizontal and vertical blanking pulses pin 15) may be applied here, If rectangular blanking pulses of not greater than =1V negative excursion, or DC coupled pulses This is derived from the chroma signal bandpass filter. of simatar amplitude whose negative excursion is at zero designed to provide 3 push-pull input An input signal volts DC are applied, the signal level at the luminance amplitude of at least 4mV peak-to-peak ss reauired between output {pin 8) during blanking wil be OV. However, if the pins 1 and 15. Both pins require OC potential of blanking pulses applied to pin B have an amplitude of ~2 to approximately +3.0V. This is derived a a common mode 4 the. signal level at. the luminance output during signal from a network connected to pin 7 (burst outputl.In blanking. will be *1.8V, The negative pulse amplitude this way OC feedback is provided over the burst channel 0 gheuld not exceed —5V_ stabilise its operation. Al figures for the chrominance signal * are based on a colour bar signal with 75% saturation; ie 8. Chroma Signal Output burst-to:chroma ratio of input signal is 1:2. With a 1V peaicto-peak burst output signal (pin 7) and at nominal contrast and saturation setting (pins 2 and 13) 2 DC Contrast Contra! the chroma signal output amolitude is 1V peak-to-peak. An With +3.7V on this pin, the gain in the luminance external network is required which provides OC negative channel is such that a 0.4mA black-to-white input signal to ‘feedback in the chroma channel via pin 12. pin 3 gives a luminance output signal amplitude on pin § of ; lamping Ps 1V black-to-white. A variation of voltage on pin 2 between 1 Burst Gating and Clamping Pulse Input 45.6 and +2V gives a corresponding gain variation of +6 A positive pulse of not less than SOWA is required on this to >=14d3. A similar variation in gain in the chroma —_ pin to. provide gating in the burst channel and luminance channel occurs in order 10 provide the correct tracking channel black-level clamp circuit. The timing and width of between the two signals. Beam current limiting can be this current pulse should be such that no aopreciable applied via the contrast control network as shown in the encroachment occurs into the syne. pulse or picwure line peripheral circuit, when a separate overwind is available on periods during normal operations of the receiver. the line output transtormer ia 11. +12V Supply (Veo) 3. Luminance Signal Input anal tap Correct operation occurs within the range 108 to This terminal has avery low input impedance and acts as —-«13.2V. All signal and control. levels have a linear a current sink, The luminance signal from the delay line is dependency on supply voltage but, in any given receiver fed via a series terminating resistor and a OC blocking design this range may be restricted due to considerations of capacitor and requires to be about O.AMA peak-to-peak tracking between the power supply variations and picture amplitude. A OC bias current is requited via a 12KS2 resistor contrast and chroma 'avels, The power dissipation must not to the +12V fine exceed 580mW at 60°C ambient temperature 4. Charge Storage Capacitor for Black Level Clamp 12, DC Feedback for Chroma Channel (x00 pin 9} 6. Luminance Signal Output 13. Chroma Saturation Controt ‘An emitter follower provides a low imoedance output A control range of +648 to>~ 1448 1s provided over a signal of 1V black-towhite amplitude at nominal contrast range of OC potential on pin 13 from 6.2 to 2.7V, Colour setting having @ nominal black level in the range O to +2.7V killing is also achieved at this terminal by reducing the DC {An external emitter load resistor is required, not less than potential to less than +1V, e.g. from the TBA54O colour 1k. If a greater tuminance output is reauired than 1V, killer output terminal, The minimum “kill factor” is 4008. with normal control settin input current swin ch normal contol settings. the input CUTEST SWINE 44 ce taput pin 3 should be increased in proportion A negative going potential gives an ACC range of about . f 6 Grightnes Contra 2608 starting at +1.2V. From 1V to BOOmY the steepest Over the range of potential +0,9 10 +1.7V the black level _ part of the characteristic occurs, but a small amount of gain of the tuminanee output signal (pin 5) is increased from 0 reduction also occurs trom BOOmV to 500mV. The input to #2.7V. The output signal black level remains at +2.7V resistance is atleast SOKO. he potential on pin 6 isi ve +17V. . . when the potential on pin 6 is increased above 48. Chroma Signal Input (ae pin 1) 7, Bure Output 16. Negative Supply, OV (Earth) A IV peak-to-peak burst (controlled by the ACC system) is produced here. Also, to achieve good OC stability by negative feedback in the burst channel the OC potential at this pin is fed back to pins 1 and 15 via the chroma input transformer 219
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