TBA560C NSC | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 4
Technical content
Q .
3 A National TV Circuits
2 Semiconductor
2) TBAS60C Luminance and Chrominance Control Combination General Description The TBAS6OC is an integrated circuit for processing and The chrominance amplifier comprises: controlling luminance and chrominance signals in PAL = Gain-controtied amplifier TV receivers. we ® OC chroma gain contro! tracked with contrast control The luminance amplifier comprises: © DC contrast control © Separate dc saturation control = Brightness control © PAL delay line driver ™ Black level clamping ® Burst gate ® Blanking of flyback ® Color killer © Input matched to the luminance delay line ® Chroma signal flyback blanking a Input matched to the luminance deley ing © Chrome slnel fivback blanking) Connection Diagram q, ...+ine packene aniorrmesscovrmon 4 rev restive surmey ‘See NS Package N16C Typical Application TOE mac * _ i He A} ne Pa > C4 i = A oy = ca eo ro {] Eset sees Eons — hep F4 soe j P| | py Lee sesecmen pee =r >, | Qe ste 11-56
Absolute Maximum Ratings (note 1) wo vine 132 la -10ma | ‘V8-16 Min. Vv Continuous Total Power Dissipation 550 mw V10-16 Min, sv Operating Free Air Temperature Range 20°C to +60°C V12-16 SV to +6V ‘Storage Temperature Range 65°C to +150°C. V13-16 -3V to +6.5V Lead Temperature (Soldering, 10 seconds) 300°C V14-16 Min, “Vv Electrical Characteristics with v11-16= 12v, Ta = 25°C (as measured in typical application circuit) VIS Chrominance input Signal Range 4 80 mVpp (Value of Color Bars With 75% Saturation) Ig Luminance Input Current 05 15 mApp Black to White V2-16 Contrast Control Characteristic Full Gain 5.6 v 6dB Attenuation 37 v 20 dB Attenuation 20 v (Note 2) V6-18 Brightness Control Voltage for (ote 3) 13 v Black Level of 1.5V at Pin V8-18 Flyback Blanking Pulses v8.16 For OV Blanking Level at Pin 5 0 05 4 Veo For 1.5V Blanking Level at Pin 5 2 “25 “3 Vee V13-16 Saturation Contro! Characteristic Full Gain 62 v 6 dB Attenuation 44 v
2048 Attenuation 27 v
(Note 2) ho Burst Gating Pulse 0.05 1 mA V13-16 Color Killer 05 1 v Automatic Chrominance Control i416 Voltage for Maximum Gain 12 v Voltage for Minimum Gain os v Gain Reduetion 26 8 Input Resistance 50 «2 V5-16 Luminance Output Voltage (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 ‘V9-16 Chrominance Output at Nominal (Note 2) 1 Vee Contrast and Saturation 3.dB Bandwidth of Chrominance 5 MHz and Luminance Amplifier Matching of Luminance to 2 4B Chrominance Ratio at 10 dB Contrast Controt Note 1: V2-16 and V13-16 must always be lower than V11-16. Note 2: Typical or nominel contrast or saturetion = 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 t 2.7V. 11-57
3 Pin Function Description
s 1. Balanced chroma signal input (in conjunction with 8. Flyback blanking input waveform. Negative-going = pin 15). This is derived from the chroma signal bandpass: horizontal and vertical blanking pulses may be applied filter, designed to provide a push-pull input. An input here. If rectangular blanking pulses of not greater than signal amplitude of at least 4 mVp-p is required between —1V negative excursion, or de coupled pulses of similar pins 1 and 15. Both pins require a dc potential of approx- amplitude whose negative excursion is at zero volts de are imately +3.0V. This is derived as a common mode signal applied, the signal level at the luminance output (pin 5) from a network connected to pin 7 (burst output). In during blanking will be OV. However, if the blanking this way de feedback is provided over the burst channel! pulses applied to pin 8 have an amplitude of —2 to -3V to stabilize its operation. All figures for the chrominance _the signal level at the luminance output during blanking signal are based. on a color bar signal with 75% satura- will be +1.5V. The negative pulse amplitude should not tion; i.e., burst-to-chroma ratio of input signal is 1:2. exceed -5V. in the luminance channel is such that 20.5 mA black-to- signal (pin 7) and at nominal contrast and saturation white input signal to pin 3 gives a luminance output setting (pins 2 and 13) the chroma signal output ampli- signal amplitude on pin 5 of 1V black-towhite. A tude is 1 Vp-p. An external network is required which Variation of voltage on pin 2 between +5.6V and +2V _ provides dc negative feedback in the chroma channel via gives a corresponding gain variation of +6 to >-14dB. pin 12. 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 10. Burst gating and clamping pulse input. A positive contrast control network as shown in the peripheral pulse of not less than 504A is required on this pin to circuit, when a separate overwind is available on the line provide gating in the burst channel and luminance channel output transformer. 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 line 3. Luminance signal input. This terminal has a very low periods during normal operation of the receiver. 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 11, +12V LT supply. Correct operation occurs within current is required via a 12 kQ resistor to the +12V line. 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 a variations and picture contrast and chroma levels. The 4, Charge storage capacitor for black level clamp. power dissipation must not exceed 650 mW at 60°C ambient temperature. 5. Luminance signal output. An emitter follower pro- Vides 3 low impedance output signal of 1V black-to-white 4. DC feedback for chroma channel (see pin 9). 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 1k. If agreater 13. Chroma saturation control. A control range of +6 luminance output is required than 1V, with normal to > ~14 dB is provided over a range of de potential on control settings, the input current swing at pin 3 should pin 13 from 6.2 to 2.7V. Color killing is also achieved be increased in proportion. at this terminal by reducing the dc potential to less than +1V, eg., from the TBAS40 color killer output terminal. The minimum “kill factor” is 40 dB. 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 14. ACC input. A negative-going potential gives an ACC black level remains at +2.7V when the potential on pin 6 range of about 26 dB starting at +1.2V. From 1V to is increased above +1.7V. 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 least 50 kQ. 7. Burst output. A 1 Vp-p burst (controlled by the ACC system) is produced here. Also, to achieve good de . Nebity by negative feedback in the burst chennel the 18 Chrome signal input (see pin 1). de potential at this pin is fed back to pins! and 16 via the chroma input transformer. 16. Negative supply, OV (Earth). : 11-58
fees) lies Set