TDA4433 tv signal identification circuit and afc interface december 1992 1 2 3 4 5 6 7 14 13 12 11 10 9 8 output a afc oso curve input stabilized voltage out identification time constant output b n.c. gnd video signal input h flyback input sensitivity control identification signal output n.c. n.c. v s 4433-01.eps pin connections dip14 (plastic package) order code : TDA4433 . identification of true tv stations only . low impedance output of the identi- fication signal . digital control signal for automat- ic search and afc operation . thermal compensation of the volt- age regulator description the TDA4433 is a monolithic integrated circuit in a 14 lead dual-in-line plastic package. it integrates the following functions : - tv signal identificator - sync. separator - thresh- old detector - digital interface - voltage regulator. 1/5
4433-02.eps * open collector outputs block diagram absolute maximum ratings symbol parameter value unit v s supply voltage (pin 1) 16 v v 3 voltage at pin 3 16 v v 13 voltage at pin 13 5, + 6 v i 6 ;i 2 pin 6 and pin 2 current 1 ma i 10 pin 10 current 2 ma i 11 pin 11 current 2 ma i 12 pin 12 current 2 ma p tot total power dissipation at t amb 70 c 800 mw t stg ,t j storage and junction temperature 40, +150 c 4433-01.tbl thermal data symbol parameter value unit r th j-amb thermal resistance junction-ambient max. 100 c/w 4433-02.tbl electrical characteristics (refer to the test circuit ; v s =12v, t amb =25 c, unless otherwise specified) symbol parameter test conditions min. typ. max. unit v s supply voltage range (pin 1) 10.8 14.5 v i s supply current (pin 1) v s = 14.5 v 30 ma v 2 output voltage f tuning f o 0.8 v v 6 output voltage f tuning f o v s 0.5 v 4433-03.tbl TDA4433 2/5
electrical characteristics (continued) symbol parameter test conditions min. typ. max. unit v 3 input voltage range 4 8 v v 3u upper threshold voltage see figure 2 v 4 25 v 4 v 4 +25 mv v 3l lower threshold voltage see figure 2 v 4 425 v 4 400 v 4 375 mv r 3 input resistance v 3 =v 4 1.4 m w v 4 regulated voltage i 4 = 1 ma 6.6 v i 4 output current 1ma r 4 output differential resistance 60 w d v 4 d t s regulated voltage thermal drift 2 mv/ c v 10 identification output voltage no identification, i 10 = 1 ma v s 1.3 v identification 20 mv r 10 output resistance 100 w v 12 switch off threshold voltage 1 v i 12 input flyback current 0.5 1.5 ma r 12 input resistance v 12 =3v 10 k w t fly flyback pulse duration 10 17 m sec. t time delay between leading edges of flyback pulse and sync. pulse 0 3.5 m sec. v 13 video input signal (peak to peak) 2.5 4.5 v v 13 sync. pulse amplitude (above black level) 0.52 v r 13 input resistance 1.5 k w 4433-04.tbl input voltage (v 3 ) output voltage (v 2 ) output voltage (v 6 ) v 3 >v 4 high level low level v 4 0.4 v < v 3 TDA4433 3/5
22nf 5k w 6.2k w 10k w 100k w 56k w 22k w 82k w 47k w 3.3k w p2 p1 3 4 11 5 ab s1c s1d s1e s2 13 12 2 10 6141 TDA4433 150pf 5.6k w 47nf 0or3v(dc) 0or3v(dc) a b s1a s1b 11k w 11k w 11k w 0.1 m f +v = 12v s digital afc out TDA4433 identif. out pos. video in hor. flyback in h l l h h l out b out a (no ident.) (ident.) s1 a : static tests b : functional tests b : functional tests s2 a : dc or pulses width p2 sensitivity control p1 digital afc perfect tuning 4433-05.eps test circuit application information (refer to the block diagram) tv signal identification circuit the circuit recognizes only tv signals by checking logically during one line the coincidence between the horizontal flyback pulse and the pulse detected by a sync. separator. the signal identification is carried out by charging the capacitor connected to pin 5 ; when the capaci- tor voltage overcomes a fixed threshold voltage, a schmitt trigger switches and enables the afc con- trol. if a tv signal is recognized, the capacitor is slightly charged every line and its voltage reaches the thresholdafter a number of line which is defined by the value of the capacitor itself. the sensitivity of the identification circuit, hence the number of lines required to charge the capacitor, can be ad- justed by means of the resistor connected between pin 11 and ground. when the identification has been made, a signal (level l) is available at pin 10. threshold circuit the circuit detects 3 ranges of afc voltage and in combination with the tv signal identification circuit drives the electronic switches. with a correct tv signal, the output levels corre- sponding to the 3 ranges are : (v 2 )(v 6 ) f o d f high level low level f o low level low level f o + d f low level high level the TDA4433 has two separate outputs which can have only two states, high (h) or low (l). the outputs at pin 2 and at pin 6 remain at a low level with no video signal input or with a video signal not identified as a true tv signal. both pin 2 and pin 6 are open collector outputs and must be pulled-up to the positive supply voltage by external resistors. voltage regulator the circuit can deliver 1 ma and it can be used as d/a converter reference to supply fine tuning volt- age. TDA4433 m p m206 m p interface with microprocessor 4433-05.eps epm system configurations TDA4433 4/5
14 8 17 i a1 l b e d z b z e3 f b1 e pm-dip14.eps package mechanical data 14 pins - plastic 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. a1 0.51 0.020 b 1.39 1.65 0.055 0.065 b 0.5 0.020 b1 0.25 0.010 d 20 0.787 e 8.5 0.335 e 2.54 0.100 e3 15.24 0.600 f 7.1 0.280 i 5.1 0.201 l 3.3 0.130 z 1.27 2.54 0.050 0.100 dip14.tbl TDA4433 5/5
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