TBA560C National TV Circuits Semiconductor TBA560C Luminance and Chrominance Control Combination General Description The TBA560C is an integrated circuit for processing and The chrominance amplifier comprises: controlling tuminance and chrominance signals in PAL Gain-controlled amplifier TV receivers. : . gs : DC chroma gain contro! tracked with contrast control The juminance amplifier comprises: Separate dc saturation control DC contrast control @ PAL detay line dri . elay line driver Brightness control v m Black level clamping = Burst gate @ Blanking of flyback Color killer {Input matched to the luminance delay line Chroma signal flyback blanking onnection Diagram Cc D ag a Dual-In-Line Package CHADMA art 4 U = no DC CONTRAST CONTROL ~4 pS eacanceo sananee woyt 2 ee Dual-In-Line Package, Order Number TBAS6OC . See NS Package N16A eiacK Level _4f 113 CHROMA CLAMP CAPACITOR SATURATION CONTROL Luminance oureuT 4 CTA aay Quad-tn-Line Package, Order Number TBASG0CQ See NS Package N16C n BRIGHTNESS CONTROL a= 12 POSITIVE SUPPLY 1 10 BUAST GATE ANO BURST OUTPUT =] [CLAMPING PULSE INPUT Fuvaack 8) L2. cHnoma oureur BLANKING INPUT TOP VIEW Typical Application oman 2% COMPOSITE DELAY LINE a vined INFUT FROM TCAz70 tk SURST ouTPuT VW BLANKING FEEDBACK BLACK LEVEL CLAMP QLANKING CONTRAST AND QUTPUT PULSE CONTROL GENERATOR GATING PULSE GENERATOR REFERENCE LEVEL FOR CLAMP AMPLIFIER AND OUTPUT BRIGHTNESS CONTROL SATURATION am 10k BLANKING ZSTAGE AND GATING swiTcH BURST GATE 15k AND OUTPUT ace GAIN AMPLIFIER CONTROL CHROMA aureutT ACK PORCH PULSE CONTRAST BEAM CURRENT LIMITING INPUT (EARTHY END OF EMT OVERWIND) azx70_ 19-154 Ace COLOR KILLER FROM TRASAO POTENTIAL 11-56Absolute Maximum Ratings (note 1) = V11-16 13.2V iq -10 mA 4 V8-16 Min. -5V Continuous Total Power Dissipation 550 mw oO V10-16 Min. -V Operating Free Air Temperature Range 20C to +60C 2 V12-16 -5V to +6V Storage Temperature Range 65C to +150C oO V13-16 -3V to +6.5V Lead Temperature (Soldering, 10 seconds) 300C V14-16 Min. -5V Electrical Characteristics with V11-16 = 12V, Ta = 25C (as measured in typical application circuit) PARAMETER CONDITIONS MIN Tye MAX UNITS V1-15 Chrominance Input Signal Range 4 80 mVp-p (Value of Color Bars With 75% Saturation} I3 Luminance Input Current 0.5 15 mAp-p Black to White V2-16 Contrast Controi Characteristic Full Gain 5.6 Vv 6 dB Attenuation 3.7 v 20 dB Attenuation 2.0 Vv (Note 2) V6-16 Brightness Contro! Voitage for (Note 3) 1.3 Vv Black Level of 1.5V at Pin 5 V8-16 Fiyback Blanking Pulses V8-16 For OV Blanking Level at Pin 5 i) -0.5 -1 Vp-p For 1.5V Blanking Level at Pin 5 -2 2.5 ~3 Vp-p V13-16 Saturation Controt Characteristic Fuil Gain 6.2 Vv 6 dB Attenuation 4.4 Vv 20 GB Attenuation 2.7 Vv (Note 2) lio Burst Gating Pulse . 0.05 1 mAp-p V13-16 Color Killer 0.5 1 v Automatic Chrominance Contro! , V14-16 Voltage for Maximum Gain 1.2 Voltage for Minimum Gain 0.5 Gain Reduction 26 dB Input Resistance 50 kQ V5-16 Luminance Output Voitage (Black- {Note 2) 1 3 Vp-p White) at Nominal Contrast and Input Current as above Black Level Shift Due to Changes 100 mV of Contrast and Video Content at Constant Brightness Setting V7-16 Burst Output / 1 Vp-p V9-16 Chrominance Output at Nominal (Note 2} 1 Vp-p Contrast and Saturation 3 dB Bandwidth of Chrominance 5 MHz and Luminance Amplifier Matching of Luminance to . 2 dB Chrominance Ratio at 10 dB Contrast Control Note 1: 2-16 and V13-16 must always be lower than V11-16. Note 2: Typical or nominal contrast or saturation = maximum value 6 dB. Thus the control is +6 to 14 dB on the nominal. Note 3: When V6-16 is increased above 1.7V the black level of the output signal remains at 2.7V. 11-57TBA560C Pin Function Description 1. Balanced chroma signal input (in conjunction with pin 15). This is derived from the chroma signal bandpass filter, designed to provide a push-pull input. An input signal amplitude of at least 4 mVp-p is required between pins 1 and 15. Both pins require a dc potential of approx- imately +3.0V. This is derived as a common mode signal from a network connected to pin 7 (burst output). In this way dc feedback is provided over the burst channel to stabilize its operation. All figures for the chrominance signal are based. on a color bar signal with 75% satura- tion; i.e., burst-to-chroma ratio of input signal is 1:2. 2. DC contrast control. With +3.7V on this pin, the gain in the luminance channel is such that a 0.5 mA black-to- white input signal to pin 3 gives a juminance output signal amplitude on pin 5 of 1V_black-to-white. A variation of voltage on pin 2 between +5.6V and +2V gives a corresponding gain variation of +6 to > -14 dB. A similar variation in gain in the chroma channel occurs in order to provide the correct tracking between the two signals. Beam current limiting can be applied via the contrast contro! network as shown in the peripheral circuit, when a separate overwind is available on the line output transformer, 3. Luminance signal input. This terminal has a very low input impedance and acts as a current sink. The lum- inance signal from the delay line is fed via a series terminating resistor and a de blocking capacitor and requires to be about 0.5 mAp-p amplitude. A dc bias current is required via a 12 kQ resistor to the +12V line. 4, Charge storage capacitor for black level clamp. 5. Luminance signal output. An emitter follower pro- vides a low impedance output signal of 1V black-to-white amplitude at nominal contrast setting having a nominal black level in the range 0 to +2.7V. An external emitter load resistor is required, not less than 1 k&2. If a greater luminance output is required than 1V, with normal control settings, the input current swing at pin 3 should be increased in proportion. 6. Brightness control. Over the range of potential +0.9 to +1.7V the black level of the luminance output signal! (pin 5) is increased from 0 to +2.7V. The output signal black level remains at +2.7V when the potential on pin 6 is increased above +1.7V. 7. Burst output. A 1 Vp-p burst (controlled by the ACC system) is produced here. Also, to achieve good dc stability by negative feedback in the burst channel the dc potential at this pin is fed back to pins1 and 15 via the chroma input transformer. 8. Flyback blanking input waveform. Negative-going horizontal and vertical blanking pulses may be applied here. If rectanguiar blanking pulses of not greater than 1V negative excursion, or dc coupled pulses of similar amplitude whose negative excursion is at zero volts dc are applied, the signal level at the luminance output (pin 5) during blanking will be OV. However, if the blanking pulses applied to pin 8 have an amplitude of 2 to -3V the signal tevel at the jluminance output during blanking will be +1.5V. The negative pulse amplitude should not exceed -5V. 9. Chroma signal output. With a 1 Vp-p burst output signal (pin 7) and at nominal contrast and saturation setting (pins 2 and 13) the chroma signal output ampli- tude is 1 Vp-p. An external network is required which provides de negative feedback in the chroma channel via pin 12. 10. Burst gating and clamping pulse input. A positive pulse of not less than 50uA is required on this pin to provide gating in the burst channel and luminance channel black-level clamp circuit. The timing and width of this current pulse should be such that no appreciable en- croachment occurs into the sync pulse or picture tine periods during normal operation of the receiver. 11, +12V LT supply. Correct operation occurs within the range 10.8 to 13.2V. All signal and control levels have a linear dependency on supply voltage but, in any given receiver design this range may be restricted due to considerations of tracking between the power supply variations and picture contrast and chroma levels. The power dissipation must not exceed 550 mW at 60C ambient temperature. 12. DC feedback for chroma channel (see pin 9). 13. Chroma saturation control. A control range of +6 to > 14 dB is provided over a range of de potential on pin 13 from 6.2 to 2.7V. Color killing is also achieved at this terminal by reducing the dc potential to less than +1V,e.g., from the TBA540 color kifler output terminal. The minimum kill factor is 40 dB. 14. ACC input. A negative-going potential gives an ACC range of about 26 -dB starting at +1.2V. From 1V to 800 mV the steepest part of the characteristic occurs, but a small amount of gain reduction also occurs from 800 mV to 500 mV. The input resistance is at teast 50 kQ. 45. Chroma signal input (see pin 1). 16. Negative supply, OV (Earth). ' 11-58TBAS560C: Schematic Diagram sot ATL AL i9Hd SOUL 12s Sz 11-59