TEA2128 color tv scanning and power supply processor december 1992 advance data 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 24 23 22 21 11 12 frame saw-tooth vco input 50% capacitor video input noise measurement output reference vcr detector output 1 filter soft start capacitor s.m.p.s. feed-back ground v video indentification capacitor & osd control frame safety input identification output line saw-tooth current reference line monostable capacitor line output supersandcastle output line flyback input 2 filter frame saw-tooth output cc v cc /2 s.m.p.s. output 2128-01.eps pin connections shrink24 (plastic package) order code : TEA2128 deflection . automatic vcr mode recognition for time constant switching . video identification circuit . deflection 500khz resonator oscil- lator . no line and frame oscillator ad- justment . dual pll for line deflection . super sandcastle output . internal synchro inhibition for osd mode . automatic 50hz/60hz standard identi- fication . excellent interlacing control . frame safety input . frame sawtooth generator s.m.p.s. control . error amplifier and phase modula- tor . synchronization with horizontal deflection . start up processor . master/slave concept facilities this is advance information on a new product now in development or undergoing evaluation. details are subject to change without no tice. description the TEA2128 is a complete (horizontal and verti- cal) deflection processor with secondary to primary s.m.p.s. control for color tv sets. 1/8
1 line logic frame logic supersand cast le generat or line saw-tooth generator voltage reference line monostable phase control line output 50/60hz & mute output frame security detection vco 500khz line synchro separator noise measurement auto vcr recognition 3 4 5 6 7 8 video identification 2 frame saw-tooth generator frame separator 1 24 2 23 22 21 line output s.m.p.s output inhibition pwm stage 10 11 9 14 15 16 17 18 19 20 inhibition s.m.p.s. starting system inhibition 2 s ls cc v/2 ref v 500khz osd osd ident 60hz burst mute burst 1 mute 2 s v cc 50/60hz mute reset 1.3v 1.3v 470 ? 4.7m ? 220nf 100nf cbs503b 2.2 ? 220nf 200v dc 1nf 2.2k ? frame out v cc 470k ? 2 adjust 22nf v pp 10 47k ? line flyback v cc 1k ? towards line driver 1.5nf 3.32k ? (1%) 3.3nf 10k ? 100pf standard 50/60hz & mute output v cc frame yoke voltage 100k ? 1nf osd control 1nf 12 13 v cc 330 ? tea2260/61 140v v cc 3.9k ? 2.7k ? 33nf 2.2 f 470k ? 100k ? 4.7nf 4.7nf 10 f video 220nf 1.3v 140v adjustment 2128-02.eps block diagram TEA2128 2/8
absolute maximum ratings symbol parameter value unit v cc supply voltage 13.5 v i 11 output current 80 ma i 20 input current 40 ma i 22 input current 5 ma t amb operating ambient temperature 0 , 70 o c 2128-01.tbl thermal data symbol parameter value unit r th(j-a) junction-ambient thermal resistance 60 o c/w 2128-02.tbl electrical characteristics (t amb =25 o c; v cc = 12v; pulse duration 50% of the amplitude) symbol parameter pins test conditions min. typ. max. unit supply voltage 13 12 v supply current 13 without load in pins 11, 16, 21, 24 30 ma video input video signal amplitude 4 z source < 200 ? 0.2 1 3 v pp push out current 4 during the synch. pulse - 30 a pull in current 4 during the line 5 a 50% synch. pulse clamp push out current 3 during the synch. pulse - 350 -900 a pull in current 3 during the line 25 a 1 and 3 comparator short time output current 7 - 8 identification high 1.5 ma long time output current 7 - 8 identification high 0.5 ma vco catching range 2 ceramic csb 503b, r serial = 470 ? 15 16.3 khz transfer characteristic ? f pin 20/ ? v pin 8 2 khz/v free running frequency without video signal 15.6 khz video identificati on and standard output no video on pin 4 16 i 16 = 3ma 0 500 mv 60hz video 16 i 16 = 3ma 5.7 6 6.3 v 50hz video 16 i 16 =10 a 10.5 11 v video identificati on and o.s.d. control identification time 14 2 s output current 2 s pulse within the synchro pulse 2 s pulse outside the synchro pulse -135 65 -160 80 -185 95 a a identification threshold 4.6 v osd switching threshold lower than 1 v reference voltage output voltage 6 i 6 =0 v cc /2 v output impedance ? i 6 = 50 a 600 ? max output current 200 a auto vcr switch switching threshold /v 6 7 with no noise on the video (v 5 6v) with noise on video (6v < v 5 < 7.3v) st* = 0.69 v 5 - 3.85 0.28 0.3 st* 0.32 v v 2128-03.tbl TEA2128 3/8
electrical characteristics (continued) (t amb =25 o c; v cc = 12v; pulse duration 50% of the amplitude) symbol parameter pins test conditions min. typ. max. unit noise gate measure sampling time 5 on the synch. pulse bottom 2 s max. push out current max. noise 350 a vcr switch inhibition threshold 7.3 v measure bandwidth (-3db) 700 2000 khz short time constant manual switching threshold active under threshold 4.5 5 5.5 v long time constant from lower to higher voltage 6.9 7.3 7.6 v manual switching threshold from higher to lower voltage 6.8 7.2 7.5 v 2 comparator (pin 14) output current during line flyback 600 a delay between 2 falling edge and the middle video sync. pulse 23 -4 f vco = 500 khz 2.8 s line monostable charge current 19 line output high - 67 a discharge current 19 line output low 120 a flip-flop threshold 19 falling edge on the line output 1.3 v line output low level 20 i 20 =20ma 1 v pulse duration r 18 = 3.32k ? ,c 19 = 1.5nf 27.5 29 30.5 s 2 adjustment range 20 controlled by v 23 compared with video signal 16 s line saw-tooth charge current 17 r 18 = 3.32 k ? - 180 a discharge current 17 7 ma discharge duration controlled by logic vco 500khz 6.5 s line flyback input blanking line threshold 22 0.38 0.4 0.42 v 2 loop threshold and line output inhibition 20 2.85 3 3.15 v input current - 0.4v < v 22 < 0.4v 0.4v < v 22 <3v 3v < v 22 -10 -5 -1 a a a super sandcastle generator burst level 21 r l = 2.2 k ? to ground 9v line blanking 21 4 4.5 5 v frame blanking 21 2 2.5 3 v delay between the midde of the video sync. pulse and the rising edge of the burst (t 1 ) 21 2.8 s 2128-04.tbl t 1 2128-03.eps TEA2128 4/8
electrical characteristics (continued) (t amb =25 o c; v cc = 12v; pulse duration 50% of the amplitude) symbol parameter pins test conditions min. typ. max. unit super sandcastle generator (continued) burst pulse duration 21 21 50hz 60hz 4.4 3.9 s s line blanking duration 22 fixed by flyback signal pin 22 frame blanking duration 21 fixed by the logic 21 line frame saw-to oth generator low dc voltage 24 1.3 v discharge current 1 15 60 ma 60hz internal 1 8 a frame logic synch. free running period 1-24 without video signal 315 line synchronization windows identification low identification 50hz high identification 60hz high vcr mode 247 309 247 247 361 315 277 361 line line line line frame safety input switching threshold 15 actived without negative pulse during frame blanking time. 1.3 v output current 40 50 67 a s.m.p.s. input current 10 v pin 10 =v ref 2 a transfer characteristic ? t pin 11 / ? v pin 10 1.9 s/ v t on (max.) 11 28 s t on (min.) 11 1 s high level voltage 11 r loa d / gnd = 500 ? 9v soft-start v cc starting voltage for line and s.m.p.s. 13 v cc rising 7 7.4 v switch-off voltage for line and s.m.p.s. output 13 v cc decreasing 6.5 v discharge current 9 before soft start period, v cc >7v v pin 9 >v max. pin 17 during soft start period, v cc >7v v pin 9 TEA2128 5/8
- high performance frame and line synchronization with interlacing control. - supersandcastlegenerator - automatic 50hz / 60hz standard identification - frame saw-tooth generator - video identification circuit - very steady free running mode of the line and frame oscillator in osd mode. this allows on screen display without phase jitter in research mode of the tuner - automatic vcr mode recognition for time con- stant switching - switching mode regulated supply comprising er- ror amplifier and phase modulator. this allowed a secondary switch mode power regulation with a master slave concept and provides active standby facilities - line and s.m.p.s. start-up processor - frame safety input working description synchronization separator line synchronization separator is clamped to black level of input video signal with synchronization pulse bottom level measurement. the synchronization pulses are divided centrally between the black level and the synchronization pulse bottom level, to improve performance on video signal in noise conditions. frame synchronization frame synchronization is fully integrated (no exter- nal capacitor required). the frame timing identification logic permits auto- matic adaptation to 50-60hz standards or non-in- terlaced video. an automatic synchronization window width sys- tem provides: - fast frame capture (7.3ms wide window) - good noise immunity (0.4ms narrow window) the internal generator starts the discharge of the sawtooth generator capacitor, so that it is not dis- turbed by line flyback effects. thanks to the logic control, the beginning of the charge phase does not depend on any disturbing effect of the line flyback. a 32 s timing is automat- ically applied on standardized transmissions for perfect interlacing. in vcr mode, the discharge time is controlled by an internal monostable independent of the line frequency and gives a direct frame synchroniza- tion. horizontal scanning the horizontalscanning frequency is obtained from the 500khz vco. the circuit uses two pll: - the first one controls the frequency - the second one controls the relative phase of the synchronization and the line flyback signals. the output pulse has a constant duration of 29 s, independent of v cc and of any delay in switching- off the scanning transistor. supersandcastle generator this output delivers a 3 level synchronization sig- nal: - burst level - line blanking level - frame blanking level in the event of vertical scanning failure, the frame blanking level goes high to protect the tube. frame scanning the current to charge the frame sawtooth gener- ator is automatically switched to 60hz operation to maintain constant amplitude. automatic vcr mode recognition for time constant switching - a third phase comparator is used to detect vcr signals and to switch the 1 short time constant. - a noise level measurement is realized on the video synchronization pulse to inhibit the short time constant if the noise level is superior to an adjustable threshold. - vcr signals are detected if peak to peak signal on pin 7 is superior to an internal threshold. this threshold is depending on the noise level. so with a no noisy video signal, the auto vcr switch sensitivity is maximum, and it decreases when the noise increases. - the sensitivity of the noise gate and the auto vcr switch is adjustable by external resistance. - long and short time constants can be selected manually by pin 5. video identification the horizontal synchronization signal is sampled by a 2 s pulse within the synchronization pulse. the signal is integrated by an external capacitor. identification output the identification function provides three different levels : - 0v : no video identification - 6v : 60hz video identification - 12v : 50hz video identification TEA2128 6/8
this information may be used for timing research in the case of frequency or voltage synthetizer type receivers and for audio muting. o.s.d. mode the o.s.d. (on screen display) function is avail- able when pin 14 is switch to ground. this function fixes line and frame frequencies to standard deflec- tion frequencies (f h = 15.6khz, f v = 50hz) and in- hibits 1 pll. this allows to have a stable text display when no signal is coming from antenna. switch mode power supply secondary to pri- mary regulation this power supply uses a differential error amplifier with an internal reference voltage of 1.3v and a phase modulator operating at the line frequency. the power transistor is turned-off during the line retrace by the falling edge of the horizontal saw- tooth. the maximum conduction angle may be monitored by forcing a voltage at pin 9. this pin can also be used for current limitation. the output pulse is sent to the primary ic (tea2260/61 via a low cost synchro transformer). s.m.p.s. start-up processor the ?soft-start? device imposes a very small con- duction angle on starting-up. this angle progres- sively increases to its nominal regulation value. on starting-up the horizontal scanning function comes into operation at v cc = 7v. the power supply then comes into operation progressively. frame blanking safety input (pin 15) the frame blanking safety checks the normal frame scanning. in the event of vertical scanning failure, the frame blanking level goes high to protect the crt. TEA2128 7/8
24 13 112 i a1 l b2 e d z b e3 f b1 e stand-off b3 stand-off pmsdip24.eps package mechanical data 24 pins - plastic shrink dip information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no licence is granted by implication or otherwise under any patent or patent rights of sgs-thomson microelectronics. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. sgs-thomson microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of sgs-thomson microelectronics. ? 1994 sgs-thomson microelectronics - all rights reserved purchase of i 2 c components of sgs-thomson microelectronics, conveys a license under the philips i 2 c patent. rights to use these components in a i 2 c system, is granted provided that the system conforms to the i 2 c standard specifications as defined by philips. sgs-thomson microelectronics group of companies australia - brazil - china - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. dimensions millimeters inches min. typ. max. min. typ. max. a 3.3 0.130 a1 0.51 0.020 b 0.35 0.59 0.014 0.023 b1 0.2 0.36 0.008 0.014 b2 0.75 1.42 0.030 0.056 b3 0.75 0.030 d 23.11 0.910 e 7.95 9.73 0.313 0.383 e 1.778 0.070 e3 19.558 0.770 e4 7.62 0.300 f 6.86 0270 i 5.08 0.200 l 2.54 0.100 sdip24.tbl TEA2128 8/8
|
