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mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 1 description the M52737SP is a semiconductor integrated circuit ampli?s video signals, having a 3-channel ampli?r with a band width of 150mhz. the circuit also features the osd mixing function. the circuit is most useful with high-resolution displays that have osd, and its function are available for each channel, including osd blanking, osd mixing, retrace blanking, wide-band ampli?ation, contrast control (main and sub), and brightness control. features frequency band width: rgb................................150mhz (3v p-p ) osd..............................................50mhz input :rgb.............................................................0.7v p-p (typ.) osd...............................................3.0v p-p min. (positive) blk (for osd)...............................3.0v p-p min. (positive) retrace blk..................................3.0v p-p min. (positive) output :rgb...........................................................4.5v p-p (max.) osd...........................................................4.5v p-p (max.) to adjust contrast and osd adj, for each, two types of controls are provided, main and sub. with the main control, the contrast or osd adj of the 3-channels can be changed simultaneously. sub controls are used to adjust the contrast of a given channel individually. the control terminals can be controlled by applying a voltage of 0 to 5v. the dc power remains stable at the ic output terminal because a feedback circuit is built in. application display monitor recommended operating condition supply voltage range....................................................11.5 to 12.5v rated supply voltage................................................................12.0v pin configuration (top view) outline 36p4e 36 33 34 35 1 4 3 2 32 5 31 6 28 9 27 10 26 11 25 12 13 14 24 23 7 8 30 29 15 22 16 21 17 20 18 19 output (g) v cc2 (b) hold (b) output (r) output (b) gnd2 (b) v cc2 (g) input (b) v cc1 (g) sub contrast (b) gnd1 (g) gnd1 (b) v cc1 (b) v cc1 (r) sub contrast (g) blk in (for osd) osd adjust gnd2 (g) input (g) hold (g) nc gnd2 (r) hold (r) gnd1 (r) main contrast sub contrast (r) input (r) v cc2 (r) M52737SP cp in brightness nc : no connection osd in (b) osd in (g) osd in (r) blk in (for retrace) nc nc block diagram b hold b osd blanking b contrast g g g osd g r r r osd r b amp b clamp g g r r b brightness hold blanking contrast amp clamp brightness hold blanking contrast amp clamp brightness b osd mix gr osd mix osd mix 35 467 11 10 12 14 13 89 2 1 15 16 18 17 34 32 33 31 30 26 27 25 23 24 29 28 35 22 21 19 20 36 output (g) v cc2 (b) hold (b) output (r) output (b) gnd2 (b) v cc2 (g) input (b) v cc1 (g) sub gnd1 (g) gnd1 (b) v cc1 (b) v cc1 (r) sub blk in osd adjust gnd2 (g) input (g) hold (g) nc gnd2 (r) hold (r) gnd1 (r) main sub input (r) v cc2 (r) cp in brightness osd in osd in (g) osd in (r) blk in (for retrace) nc nc (b) contrast(b) contrast(g) contrast(r) contrast (for osd) b-ch blk g-ch blk r-ch blk
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 2 absolute maximum ratings (ta=25 c) electrical characteristics (v cc =12v, ta=25 c, unless otherwise noted) symbol parameter ratings unit v cc supply voltage 13.0 v p d power dissipation 2403 mw t opr ambient temperature -20 to +85 c t stg storage temperature -40 to +150 c v opr recommended supply voltage 12.0 v v opr recommended supply voltage range 11.5 to 12.5 v surge electrostatic discharge 200 v symbol parameter test conditions limits unit test point (s) input external power supply (v) pulse input sw13 r-ch sw8 g-ch sw3 b-ch v4 v17 v19 v36 sw18 sw1, 5, 10, 15 sw20 min. typ. max. i cc circuit current a a - a - a - 5552 b sg4 a - a - 72 93 115 ma vomax output dynamic range t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 55 vari- able - b sg4 a - a - 6.2 7.7 9.2 v p-p vimax maximum input t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 5 2.5 2 - b sg4 a - a - 1 1.6 - v p-p gv maximum gain t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 552 - b sg4 a - a - 16.4 17.8 19.4 db d gv relative maximum gain relative to measured values above 0.8 1 1.2 - v cr1 contrast control characteristics (typical) t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 542 - b sg4 a - a - 14.5 16.0 17.5 db d v cr1 contrast control relative characteristics (typical) relative to measured values above 0.8 1 1.2 - v cr2 contrast control characteristics (minimum) t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 512 - b sg4 a - a - 0.4 0.7 1.0 v p-p d v cr2 contrast control relative characteristics (minimum) relative to measured values above 0.8 1 1.2 - v scr1 sub contrast control characteristics (typical) t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 452 - b sg4 a - a - 14.5 16.0 17.5 db d v scr1 sub contrast control relative characteristics (typical) relative to measured values above 0.8 1 1.2 - v scr2 sub contrast control characteristics (minimum) t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 152 - b sg4 a - a - 0.5 0.9 1.3 v p-p d v scr2 sub contrast control relative characteristics (minimum) relative to measured values above 0.8 1 1.2 - v scr3 contrast/sub contrast control characteristics (typical) t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 332 - b sg4 a - a - 1.1 1.8 2.5 v p-p d v scr3 contrast/sub contrast control relative characteristics (typical) relative to measured values above 0.8 1 1.2 - v b1 brightness control characteristics (maximum) t.p.35 t.p.30 t.p.25 a - a - a - 554 - b sg4 a - a - 3.0 3.6 4.2 v d v b1 brightness control relative characteristics (maximum) relative to measured values above -0.3 0 0.3 v
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 3 electrical characteristics (cont.) symbol parameter test conditions limits unit test point (s) input external power supply (v) pulse input sw13 r-ch sw8 g-ch sw3 b-ch v4 v17 v19 v36 sw18 sw1, 5, 10, 15 sw20 min. typ. max. v b2 brightness control characteristics (typical) t.p.35 t.p.30 t.p.25 a - a - a - 552 - b sg4 a - a - 1.2 1.8 2.4 v d v b2 brightness control relative characteristics (typical) relative to measured values above -0.3 0 0.3 v v b3 brightness control characteristics (minimum) t.p.35 t.p.30 t.p.25 a - a - a - 551 - b sg4 a - a - 0.3 0.7 1.1 v d v b3 brightness control relative characteristics (minimum) relative to measured values above -0.3 0 0.3 v f c1 frequency characteristics 1 (f=50mhz;maximum) t.p.35 t.p.30 t.p.25 b sg1 b sg1 b sg1 5 vari- able -- c - a - a - -2 0 2.5 db d f c1 frequency relative characteristics 1 (f=50mhz;maximum) relative to measured values above -1 0 1 - f c1 frequency characteristics 1 (f=150mhz;maximum) t.p.35 t.p.30 t.p.25 b sg2 b sg2 b sg2 5 vari- able -- c - a - a - -3 -2.0 3 db d f c1 frequency relative characteristics 1 (f=150mhz;maximum) relative to measured values above -1 0 1 - f c2 frequency characteristics 2 (f=150mhz; maximum) t.p.35 t.p.30 t.p.25 b sg2 b sg2 b sg2 5 vari- able -- c - a - a - -3 0 3 db d f c2 frequency relative characteristics 2 (f=150mhz; maximum) relative to measured values above -1 0 1 - c.t.1 crosstalk 1 (f=50mhz) t.p.35 t.p.30 t.p.25 b sg1 a - a - 55 -- c - a - a - - -30 -20 db c.t.1 crosstalk 1 (f=150mhz) t.p.35 t.p.30 t.p.25 b sg2 a - a - 55 -- c - a - a - - -20 -15 db c.t.2 crosstalk 2 (f=50mhz) t.p.35 t.p.30 t.p.25 a - b sg1 a - 55 -- c - a - a - - -30 -20 db c.t.2 crosstalk 2 (f=150mhz) t.p.35 t.p.30 t.p.25 a - b sg2 a - 55 -- c - a - a - - -20 -15 db c.t.3 crosstalk 3 (f=50mhz) t.p.35 t.p.30 t.p.25 a - a - b sg1 55 -- c - a - a - - -30 -20 db c.t.3 crosstalk 3 (f=150mhz) t.p.35 t.p.30 t.p.25 a - a - b sg2 55 -- c - a - a - - -20 -15 db tr pulse characteristics 1 t.p.35 t.p.30 t.p.25 b sg3 b sg3 b sg3 5 vari- able vari- able - b sg4 a - a - - 2.5 - nsec tf pulse characteristics 2 t.p.35 t.p.30 t.p.25 b sg3 b sg3 b sg3 5 vari- able vari- able - b sg4 a - a - - 2.5 - nsec v14th clamp pulse threshold voltage t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 552 - b sg4 a - a - 1.0 1.5 2.5 v dc w14 clamp pulse minimum width t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 552 - b sg4 a - a - 0.2 0.5 -m sec p dch pedestal voltage temperature characteristics1 t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 552 - b sg4 a - a - -0.3 0 0.3 v dc
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 4 electrical characteristics test method 1. because a description of signal input pin and pulse input pin switch numbers is already given in supplementary table, only external power supply switch numbers are included in the notes below. sub contrast voltages v4, v9 and v14 are always set to the same voltage, therefore only v4 is referred to in supplementary table. i cc circuit current measuring conditions are as listed in supplementary table. measured with an ammeter at test point a when swa is set to b. vomax output dynamic range voltage v19 is varied as described below: 1. decrease v19 gradually while inputting sg5 to pin 13 (8 or 3). measure the voltage when the bottom of the waveform output at t.p25 (30 or 35) is distorted. the voltage is called v olr (v olg or v olb ). 2. increase v19 gradually, and measure the voltage when the top of the waveform output at t.p25 (30 or 35) is distorted. the voltage is called v ohr (v ohg or v ohb ). 3. voltage v omax is calculated by the equation below: v omax =v ohr (v ohg , v ohb )-v olr (v olg , v olb ) waveform output at t.p25 (identical to output at t.p30 and t.p35.) 0.0 5.0 (v) electrical characteristics (cont.) symbol parameter test conditions limits unit test point (s) input external power supply (v) pulse input sw13 r-ch sw8 g-ch sw3 b-ch v4 v17 v19 v36 sw18 sw1, 5, 10, 15 sw20 min. typ. max. p dcl pedestal voltage temperature characteristics2 t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 552 - b sg4 a - a - -0.3 0 0.3 v dc otr osd pulse characteristics1 t.p.35 t.p.30 t.p.25 a - a - a - 55 vari- able vari- able b sg4 sw1...a other...b sg6 a - - 3.5 8 nsec otf osd pulse characteristics2 t.p.35 t.p.30 t.p.25 a - a - a - 55 vari- able vari- able b sg4 sw1...a other...b sg6 a - - 3.5 8 nsec oaj1 osd adjusting control characteristics (maximum) t.p.35 t.p.30 t.p.25 a - a - a - 5524 b sg4 b sg6 a - 3.9 4.6 5.3 v p-p d oaj1 osd adjusting control relative characteristics (maximum) relative to measured values above 0.8 1 1.2 - oaj2 osd adjusting control characteristics (minimum) t.p.35 t.p.30 t.p.25 a - a - a - 5520 b sg4 b sg6 a - - 0 0.5 v p-p d oaj2 osd adjusting control relative characteristics (minimum) relative to measured values above 0.8 1 1.2 - osdth osd input threshold voltage t.p.35 t.p.30 t.p.25 a - a - a - 5525 b sg4 sw1...a other...b sg6 a - 1.7 2.5 3.5 v dc v1th blk input threshold voltage t.p.35 t.p.30 t.p.25 b sg5 b sg5 b sg5 5525 b sg4 sw1...b sg6 other...a a - 1.7 2.5 3.5 v dc h blk retrace blk voltage t.p.35 t.p.30 t.p.25 a - a - a - 5520 a - a - b sg7 - 0.2 0.5 v dc hvth retrace blk input threshold voltage t.p.35 t.p.30 t.p.25 a - a - a - 5520 a - a - b sg7 0.5 1.5 2.5 v dc
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 5 vimax maximum input voltage v17 is changed to 2.5v, and increase the input signal amplitude gradually, starting from 700mv p-p . measure the amplitude when the output signal starts becoming distorted. gv maximum gain d gv relative maximum gain 1. input sg5 to pin 13 (8 or 3), and read the amplitude at output t.p25 (30 or 35). the amplitude is called v or1 (v og1 or v ob1 ) . 2. maximum gain g v is calculated by the equation below: 3. relative maximum gain d g is calculated by the equation below: d g v =v or1 /v og1 , v og1 /v ob1 , v ob1 /v or1 v cr1 contrast control characteristics (typical) d v cr1 contrast control relative characteristics (typical) 1. measuring conditions are as given in supplementary table. the setting of v17 is changed to 4v. 2. measure the amplitude output at t.p25 (30 or 35). the measured value is called v or2 (v og2 or v ob2 ). 3. contrast control characteristics v cr1 and relative characteristics d v cr1 are calculated, respectively, by the equations below: d v cr1 =v or2 /v og2 , v og2 /v ob2 , v ob2 /v or2 v cr2 contrast control characteristics (minimum) d v cr2 contrast control relative characteristics (minimum) 1. set v17 to 1.0v. other conditions are as given in supplementary ta b l e . 2. measure the amplitude output at t.p25 (30or 35). the measured value is called v or3 (v og3 or v ob3 ), and is treated as v cr2 . 3. contrast control relative characteristics d v cr2 are calculated by the equation below: d v or2 =v or3 /v og3 , v og3 /v ob3 , v ob3 /v or3 v scr1 sub contrast control characteristics (typical) d v scr1 sub contrast control relative characteristics (typical) 1. set v4, v9 and v14 to 4.0v. other conditions are as given in supplementary table. 2. measure the amplitude output at t.p25 (30 or 35). the measured value is called v or4 (v og4 or v ob4 ). 3. sub contrast control characteristics v scr1 and relative characteristics d v scr1 are calculated, respectively, by the equations below: d v scr1 =v or4 /v og4 , v og4 /v ob4 , v ob4 /v or4 v scr2 sub contrast control characteristics (minimum) d v scr2 sub contrast control relative characteristics (minimum) 1. set v4, v9 and v14 to 1.0v. other conditions are as given in supplementary table. 2. measure the amplitude output at t.p25 (30 or 35). the measured value is called v or5 (v og5 or v ob5 ), and is treated as v scr2 . 3. relative characteristics d v scr2 are calculated by the equation below: d v scr2 =v or5 /v og5 , v og5 /v ob5 , v ob5/ v or5 v scr3 contrast/sub contrast control characteristics (typical) d v scr3 contrast/sub contrast control relative characteristics (typical) 1. set v4, v9, v14 and v17 to 3.0v. other conditions are as given in supplementary table. 2. measure the amplitude at t.p25 (30 or 35). the measured value is called v or6 (v og6 or v ob6 ). and is treated as v scr3 . 3. relative sub contrast control characteristics d v scr3 is d v scr3 =v or6 /v og6 , v og6 /v ob6 , v ob6 /v or6 v b1 brightness control characteristics (maximum) d v b1 brightness control relative characteristics (maximum) 1. measuring conditions are as given in supplementary table. 2. measure the output at t.p25 (30 or 35) with a voltmeter. the measured value is called v or7 (v og7 or v ob7 ), and is treated as v b1 . 3. to obtain brightness control relative characteristics, calculate the difference in the output between the channels, using v or7 , v og7 and v ob7 . d v b1 =v or7 -v og7 [v] =v og7 -v ob7 =v ob7 -v or7 v b2 brightness control characteristics (typical) d v b2 brightness control relative characteristics (typical) 1. measuring conditions are as given in supplementary table. 2. measure the output at t.p25 (30 or 35) with a voltmeter. the measured value is called v or7' (v og7' or v ob7' ), and is treated as v b2 . 3. to obtain brightness control relative characteristics ( d v b2 ), calculate the difference in the output between the channels, using v or7' , v og7' , and v ob7' . d v b2 =v or7' -v og7' [v] =v og7' -v ob7' =v ob7' -v or7' v or1 (v og1 , v ob1 ) 0.7 [v p-p ] [v p-p ] g v =20log v or2 (v og2 , v ob2 ) 0.7 [v p-p ] [v p-p ] v cr1 =20log v or4 (v og4 , v ob4 ) 0.7 [v p-p ] [v p-p ] v scr1 =20log
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 6 v b3 brightness control characteristics (minimum) d v b3 brightness control relative characteristics (minimum) 1. measuring conditions are as given in supplementary table. 2. measure the output at t.p25 (30 or 35) with a voltmeter. the measured value is called v or7" (v og7" or v ob7" ), and is treated as v b2 . 3. to obtain brightness control relative characteristics ( d v b3 ), calculate the difference in the output between the channels, using v or7" , v og7" and v ob7" . d v b3 =v or7'' -v og7'' [v] =v og7'' -v ob7'' =v ob7'' -v or7'' f c1 frequency characteristics1 (f=50mhz; maximum) d f c1 frequency relative characteristics1 (f=50mhz; maximum) f c1 ' frequency characteristics1 (f=150mhz; maximum) d f c1 ' frequency relative characteristics1 (f=150mhz; maximum) 1. measuring conditions are as given in supplementary table. 2. first, sga is as input signal. input a resister that is about 2k w to offer the voltage at input pins (pin 3, pin 8, pin 13) in order that the bottom of input signal is 2.5v. inputs the voltage at hold pins (pin 23, pin 28, pin 33) in order that the bottom of sine wave output is 2v. control the main contrast (v17) in order that the amplitude of sine wave output is 4.0v p-p . by the same way, measure the output amplitude when sg1, sg2 is as input signal. 3. supposing that the measured value is treated as amplitude v or8 (v og8 or v ob8 ) when sg1 is input, or as v or9 (v og9 or v ob9 ) when sg2 is input, frequency characteristics f c1 and f c1' are calculated as follows: 4. frequency relative band widths d f c1 and d f c1' are equal to the difference in f c1 and f c1' , respectively, between the channels. f c2 frequency characteristics2 (f=150mhz; maximum) d f c2' frequency relative characteristics2 (f=150mhz; maximum) measuring conditions and procedure are the same as described in f c1 , d f c1 , f c1' , d f c1' , except that control the main contrast (v17) in order that the amplitude of sine wave output is 1.0v p-p . c.t.1 crosstalk1 (f=50mhz) c.t.1' crosstalk1 (f=150mhz) 1. measuring conditions are as given in supplementary table. 2. input sg1 (or sg2) to pin 13 (r-ch) only, and then measure the waveform amplitude output at t.p25 (30 or 35). the measured value is called v or , v og and or v ob respectively. 3. crosstalk c.t.1 (c.t.1') is calculated by the equation below: c.t.2 crosstalk2 (f=50mhz) c.t.2' crosstalk2 (f=150mhz) 1. change the input pin from pin 8 (g-ch), and measure the output in the same way as in c.t.1, c.t.1'. 2. crosstalk c.t. 2 (c.t.2') is calculated by the equation below: c.t.3 crosstalk3 (f=50mhz) c.t.3' crosstalk3 (f=150mhz) 1. change the input pin from pin 13 (r-ch) to pin 3 (b-ch), and measure the output in the same way as in c.t.1, c.t.1'. 2. crosstalk c.t. 3 (c.t.3') is calculated by the equation below: tr pulse characteristics1 tf pulse characteristics2 1. measuring conditions are as given in supplementary table. control the main contrast(v17) in order that the amplitude of output signal is 4.0v p-p . control the brightness(v19) in order that the black level of output signal is 2.0v. 2. measure the time needed for the input pulse to rise from 10% to 90% (tr1) and to fall from 90% to 10% (tf1)with an active prove. 3. measure the time needed for the output pulse to rise from 10% to 90% (tr2) and to fall from 90% to 10% (tf2) with an active prove. 4. pulse characteristics tr and tf are calculated by the equation below: tr (nsec)= (tr2) 2 -(tr1) 2 tf (nsec)= (tf2) 2 -(tf1) 2 v or8 (v og8 , v ob8 ) [v p-p ] 4.0 [v p-p ] f c1 =20log v or9 (v og9 , v ob9 ) [v p-p ] f c1 '=20log 4.0 [v p-p ] v og or v ob [v p-p ] v or [v p-p ] [db] c.t.1 =20log (c.t.1') v or or v ob [v p-p ] v og [v p-p ] [db] c.t.2 =20log (c.t.2') v or or v og [v p-p ] v ob [v p-p ] [db] c.t.3 =20log (c.t.3') 100% 90% 0% 10% tr1 or tr2 tf1 or tf2
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 7 v14th clamp pulse threshold voltage 1. measuring conditions are as given in supplementary table. 2. turn down the sg4 input level gradually, monitoring the output (about 1.8 v dc ). measure the top level of input pulse when the output pedestal voltage turn decrease with unstable. w14 clamp pulse minimum width decrease the sg4 pulse width gradually, monitoring the output. measure the sg4 pulse width (a point of 1.5v) when the output pedestal voltage turn decrease with unstable. p dch pedestal voltage temperature characteristics1 p dcl pedestal voltage temperature characteristics2 1. measuring conditions are as given in supplementary table. 2. measure the pedestal voltage at room temperature. the measured value is called p dc1 . 3. measure the pedestal voltage at temperatures of -20 c and 85 c. the measured value is called, respectively, p dc2 and p dc 3. 4. p dch =p dc1 - p dc2 p dcl =p dc1 - p dc3 otr osd pulse characteristics1 otf osd pulse characteristics2 1. measuring conditions are as given in supplementary table. control the main osd adjust(v36) in order that the amplitude of output signal is 3.0v p-p . control the brightness(v19) in order that the black level of output signal is 2.0v. 2. measure the time needed for the input pulse to rise from 10% to 90% (otr1) and to fall from 90% to 10% (otf1) with an active prove. 3. measure the time needed for the output pulse to rise from 10% to 90% (otr2) and to fall from 90% to 10% (otf2) with an active prove. 4. pulse characteristics tr and tf are calculated by the equations below : otr (nsec)= (otr2) 2 -(otr1) 2 otf (nsec)= (otf2) 2 -(otf1) 2 oaj1 osd adjusting control characteristics (maximum) d oaj1 osd adjusting control relative characteristics (maximum) 1. measuring conditions are as given in supplementary table. 2. measure the output at t.p25 (30 or 35). the pedestal level is called v lra (v lga or v lba ), and the osd level is called v hra (v hga or v hba ). 3. v lra (v lga or v lba ) is treated as oaj1. oaj1=v ora (v oga , v oba ) = v hra -v lra , (v hga -v lga , v hba -v lba ) 4. osd adjusting control relative characteristics d oaj1 are calculated by the equation below: d oaj1=v ora /v oga , v oga /v oba , v oba /v ora oaj2 osd adjusting control characteristics (minimum) d oaj2 osd adjusting control relative characteristics (minimum) measuring conditions and procedure are the same as described in note 23, except that v36 is set to 0v. osdth osd input threshold voltage 1. measuring conditions are as given in supplementary table. 2. reduce the sg6 input level gradually, monitoring output. measure the sg6 level when the output reaches 0v. the measured value is called osdth. v1th blk input threshold voltage 1. measuring conditions are as given in supplementary table. 2. make sure that signals are not being output synchronously with sg6 (blanking period). 3. reduce the sg6 input level gradually, monitoring output. measure the sg6 level when the blanking period disappears. the measured value is called v1th. h blk retrace blk voltage 1. measuring conditions are as given in supplementary table. 2. monitoring to output at that time, read the level of retrace blanking. hvth retrace blk input threshold voltage 1. measuring conditions are as given in supplementary table. 2. con?m that output signal is being blanked by the sg7 at the time. monitoring to output signal, decreasing the level of sg7. measure the top level of sg7 when the blanking period is disappeared.
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 8 input signal sg no. signals sga sine wave with amplitude of 0.7v p-p (f=1mhz) sg1 sine wave with amplitude of 0.7v p-p (f=50mhz) sg2 sine wave with amplitude of 0.7v p-p (f=150mhz) sg3 pulse with amplitude of 0.7v p-p (f=1mhz, duty=50%) pulses which are synchronous with sg4 pedestal portion sg4 pulses which are synchronous with standard video step waveform pedestal portion: amplitude, 2.5v p-p ; and pulse width, 0.5 m s sg5 standard video step waveform video signal with amplitude of 0.7v p-p (f=30khz, amplitude sometimes variable) sg6 osd blk and osd signals pulses which are synchronous with standard video step waveforms video portions: amplitude, 4.0v p-p ; and pulse width, 15 m s sg7 retrace blk signals pulses which are synchronous with standard video step waveforms video portions: amplitude, 4.0v p-p ; and pulse width, 3 m s 0.7v p-p 0.7v p-p 2.5v p-p 0.5 m s 0v 0.5 m s 4v 0v 4v 0v
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 9 apllication method for M52737SP 1) clamp pulse input input positive pulse. the calculating of clamp pulse threshold voltage is by the method as shown right. the voltage more than 2.2v is limited. recommended clamp pulse voltage is as the fig. shown right. pulse width is recommended above 15khz, 1.0 m sec above 30khz, 0.5 m sec above 64khz, 0.3 m sec . the clamp pulse circuit in ordinary set is a long roundabout way, and beside high voltage, sometimes connected to external terminal, it is very easy affected by large surge. therefore, the fig. shown right is recommended. 2) brightness action 2-1) brightness terminal used range is 1 to 5v control characteristic is shown in the right fig. . 2-2) sub brightness there is no sub brightness control function in this ic. 2-3) hold capacitor it is necessary more than 0.01 m f for this ic (when fh=15khz). in fact it is changed according with hold time (except clamping time). it is need more capacitance for longer the hold time. in other way, for application. the smaller the capacitance is, the higher the response. the more the capacitance is, the more stable the action. according to signal, it is free to set the value. (especially the status of pulse for vertical sync timing). 3) blk (for osd) input terminal input type is open base (reference to page 4). threshold voltage is 2.5v. if input of osd signal without input of blk pulse, the action will be strange. therefore, it is necessary to input blk pulse when input of osd signal. grounding this terminal when the osd function is not used. if overlay osd display period with clamp pulse period, the action will be strange. the method for this situation, recommended external circuit is as the right fig. 2.5 to 5.0v 0v v th = 2.2v-diode 1 =1.5v v th (1.5v) 18 signal brightness (1 to 5v) dc level shift the upper figure is principle 19 + + 0 12345 1 2 3 4 5 6 brightness voltage (v) output dc voltage (v) blk (for osd) 18 1 v cc c/p
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 10 4) retrace blk input terminal input type is open base. (reference to page 5). threshold voltage is 1.5v. grounding this terminal when retrace blanking function is not used. 5) osd adjust terminal used range is 0 to 5v. control characteristic is shown in the right fig. . if there are something noises from the external of the terminals, and it also affect the output of the terminals, add capacitances will be effective for it. make the terminals of osd adjust open or gnd, when osd function is not used. notice of application make the nearest distance between output pin and pull down resister. recommended pedestal voltage of ic output signal is 2v. 012345 6 1 2 3 4 5 osd adjust voltage (v) osd output (v p-p )
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 11 test circuit typical characteristics units resistance : w capacitance : f gnd gnd nc gnd v cc v cc gnd v cc gnd v cc gnd 34 32 33 31 30 26 27 25 23 24 22 29 28 560 2.2 m v19 v17 sg4 v14 v9 v4 sga sg1 sg2 sg3 sg5 100 m 0.01 m b a swa b a sw18 35 36 560 2.2 m 560 2.2 m b a sg6 sw1 b a sw3 0.01 m sw13 sw8 a 12v v cc v cc M52737SP 20 21 19 13 245 9 81012 11 13 14 6 7 15 16 17 18 v36 sg6 b a sw5 b a b a b a b a nc nc 47 m 0.01 m 47 m sw10 0.01 m 47 m sw15 c b a sg7 sw20 ambient temperature ta ( c) 0 25 50 75 100 125 400 800 1200 2400 150 -20 thermal derating (maximum rating) power dissipation p d (mw) 85 1600 2000 2403 2800
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 12 application example 19 110v dc clamp crt 12v clamp input (b) input (g) input (r) 2.2v 29 32 28 27 23 24 22 20 21 26 25 34 30 blk in (for osd) units resistance : w capacitance : f 35 31 33 36 18 8 5 9 10 14 13 15 17 16 11 12 37 26 4 1 M52737SP 560 0 to 5v osd in (b) osd in (g) osd in (r) 0.01 m 2.2 m 0.01 m 2.2 m 0.01 m 2.2 m 560 560 blk in 0.1 m (for retrace) 0.1 m 0 to 5v 0.1 m 0.01 m 0.01 m 0.01 m 0 to 5v 0.1 m 0 to 5v 0.1 m 0 to 5v 5v 0.01 m 47 m 0.01 m 47 m 0.01 m 47 m 0.1 m
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 13 description of pin pin no. name dc voltage (v ) peripheral circuit of pins description of function 1 blk in (for osd) - input pulses of minimum 3.5v. connected to gnd if not used. 2 7 12 v cc (b-ch) v cc (g-ch) v cc (r-ch) 12 - apply equivalent voltage to 3 channels. 3 8 13 input (b) input (g) input (r) 2.5 clamped to about 2.5v due to clamp pulses from pin 18. input at low impedance. 4 9 14 subcontrast (b) subcontrast (g) subcontrast (r) 2.5 use at maximum 5v for stable operation. 5 10 15 osd in (b) osd in (g) osd in (r) - input pulses of minimum 3.5v. connected to gnd if not used. 2.5v 0.9ma v cc gnd b-ch g-ch 1 1v maximum 3.5 to 5v v cc 2.5v 0.24ma cp gnd 2k 2k 2.5v 1.5k 23.5k v cc gnd v cc 2.5v gnd 1.1ma 1v maximum 3.5 to 5v
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 14 description of pin (cont.) pin no. name dc voltage (v ) peripheral circuit of pins description of function 6, 31 11, 26 16, 21 gnd (b) gnd (g) gnd (r) gnd - 17 main contrast 2.5 use at maximum 5v for stable operation. 18 cp in - input pulses of minimum 2.5v. input at low impedance. 19 brightness - 20 blk in (for retrace) - input pulses of minimum 2.5v. connected to gnd if not used. v cc 2.5v gnd 17 41k 11k v cc 2.2v gnd 41k 18 0.5v maximum 2.5v minimum b-ch g-ch v cc gnd 19 20.3k 2.1v 0.25ma v cc gnd b-ch g-ch 20 45k 0.5v maximum 2.5 to 5v
mitsubishi ics (monitor) M52737SP 3-channel video preamplifier with osd mixing, retrace blanking 15 description of pin (cont.) pin no. name dc voltage (v ) peripheral circuit of pins description of function 22, 27, 32 nc 23 28 33 hold (r) hold (g) hold (b) variable a capacity is needed on the gnd side. 24 29 34 v cc2 (r) v cc2 (g) v cc2 (b) apply 12 used to supply power to output emitter follower only. apply equivalent voltage to 3 channels. 25 30 35 output (r) output (g) output (b) variable a resistor is needed on the gnd side. set discretionally to maximum 15ma, depending on the required driving capacity. 36 osd adjust at open 5.5v pulled up directly to v cc or open if not used. 1k 0.2ma v cc gnd pin 25 pin 30 pin 35 pin 24 pin 29 pin 34 50 v cc gnd 50k 65k 55k 65k 55k 1k 10p

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