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mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd blanking 1 description the M52733SP is a semiconductor integrated circuit ampli?s video signals, having a 3-channel ampli?r with a band width of 130mhz. the circuit also features the osd blanking function. the circuit is most useful with high resolution displays that have osd, and its function are available for each channel, including osd blanking, wide-band ampli?ation, contrast control (main and sub), and brightness control. features frequency band width: rgb................................130mhz (3v p-p ) input :rgb.............................................................0.7v p-p (typ.) blk ...............................................3.0v p-p min. (positive) output :rgb...........................................................4.0v p-p (max.) to adjust contrast, two types of controls are provided, main and sub. with the main control, the contrast 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 30p4b 30 27 28 29 1 4 3 2 26 5 25 6 22 9 21 10 20 11 19 18 12 13 14 17 7 8 24 23 15 16 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) osd blk in gnd gnd2 (g) input (g) hold (g) nc gnd2 (r) hold (r) gnd1 (r) main contrast sub contrast (r) input (r) v cc2 (r) nc : no connection M52733SP cp in brightness block diagram b hold b blanking b contrast g g g g r r r r output (g) v cc2 (b) hold (b) output (r) output (b) gnd2 (b) sub contrast input (g) gnd1 (b) v cc1 (r) v cc1 (g) input (b) input (r) gnd1 (g) v cc1 (b) gnd gnd2 (g) sub contrast hold (g) nc brightness hold (r) main contrast cp in gnd1 (r) sub contrast v cc2 (r) (r) (g) (b) gnd2 (r) 28 26 27 25 24 20 21 19 17 18 23 22 13 245 9 81012 11 13 14 67 15 29 30 b amp b clamp g g r r b brightness 16 v cc2 (g) osd blk in hold blanking contrast amp clamp brightness hold blanking contrast amp clamp brightness
mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd 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 1736 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 sw11 r-ch sw7 g-ch sw3 b-ch v4 v14 v16 sw1 sw15 min. typ. max. i cc circuit current a a - a - a - 555 a - b sg5 60 83 123 ma vomax output dynamic range t.p.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 55 vari- able a - b sg5 5.8 6.8 9.0 v p-p vimax maximum input t.p.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 5 2.5 1 a - b sg5 1 1.8 - v p-p gv maximum gain t.p.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 552 a - b sg5 15 17 20 db d gv rrlative maximum gain relative to measured values above 0.8 1 1.2 - v cr1 contrast control characteristics (typical) t.p.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 542 a - b sg5 14 15.5 17 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.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 512 a - b sg5 0.3 0.6 0.9 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.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 452 a - b sg5 14 15.5 17 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.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 152 a - b sg5 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.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 332 a - b sg5 0.8 1.5 2.2 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.29 t.p.25 t.p.21 a - a - a - 554 a - b sg5 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) M52733SP 3-channel video amplification with osd blanking 3 electrical characteristics (cont.) symbol parameter test conditions limits unit test point (s) input external power supply (v ) pulse input sw11 r-ch sw7 g-ch sw3 b-ch v4 v14 v16 sw1 sw15 min. typ. max. v b2 brightness control characteristics (typical) t.p.29 t.p.25 t.p.21 a - a - a - 5 5 2.5 a - b sg5 1.7 2.3 2.9 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.29 t.p.25 t.p.21 a - a - a - 551 a - b sg5 0.5 0.9 1.3 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) t.p.29 t.p.25 t.p.21 b sg2 b sg2 b sg2 5 2.5 v t a - a - -2.5 -1 3 db d f c1 frequency relative characteristics 1 (f=50mhz) relative to measured values above -1 0 1 db f c1 frequency characteristics 1 (f=130mhz;maximum) t.p.29 t.p.25 t.p.21 b sg3 b sg3 b sg3 5 2.5 v t a - a - -3 -2 3 db d f c1 frequency relative characteristics 1 (f=130mhz;maximum) relative to measured values above -1 0 1 db f c2 frequency characteristics 2 (f=130mhz; maximum) t.p.29 t.p.25 t.p.21 b sg3 b sg3 b sg3 5 1.5 v t a - a - -3 0 3 db d f c2 frequency relative characteristics 2 (f=130mhz; maximum) relative to measured values above -1 0 1 db c.t.1 crosstalk 1 (f=50mhz) t.p.29 t.p.25 t.p.21 b sg2 a - a - 55v t a - a - - -30 -20 db c.t.1 crosstalk 1 (f=130mhz) t.p.29 t.p.25 t.p.21 b sg3 a - a - 55v t a - a - - -20 -15 db c.t.2 crosstalk 2 (f=50mhz) t.p.29 t.p.25 t.p.21 a - b sg2 a - 55v t a - a - - -30 -20 db c.t.2 crosstalk 2 (f=130mhz) t.p.29 t.p.25 t.p.21 a - b sg3 a - 55v t a - a - - -20 -15 db c.t.3 crosstalk 3 (f=50mhz) t.p.29 t.p.25 t.p.21 a - a - b sg2 55v t a - a - - -30 -20 db c.t.3 crosstalk 3 (f=130mhz) t.p.29 t.p.25 t.p.21 a - a - b sg3 55v t a - a - - -20 -15 db tr pulse characteristics 1 t.p.29 t.p.25 t.p.21 b sg4 b sg4 b sg4 5 3.3 2 a - b sg5 - 3 7 nsec tf pulse characteristics 2 t.p.29 t.p.25 t.p.21 b sg4 b sg4 b sg4 5 3.3 2 a - b sg5 - 4 8 nsec v14th clamp pulse threshold voltage t.p.29 t.p.25 t.p.21 a - a - a - 552 a - b sg5 1.0 1.5 2.0 v dc w14 clamp pulse minimum width t.p.29 t.p.25 t.p.21 a - a - a - 552 a - b sg5 - 0.1 0.5 m sec p dch pedestal voltage temperatere characteristics1 t.p.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 552 a - b sg5 -0.3 0 0.3 v dc
mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd 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, v8 and v12 are always set to the same voltage, therefore only v4 is referred to in supplementary ta b l e . i cc circuit current measuring conditions are as listed in supplementary table. measured with an ammeter at test point a when sw a is set to b. vomax output dynamic range voltage v16 is varied as described below: 1. increase v16 gradually while inputting sg6 to pin 11 (7 or 3). measure the voltage when the top of the waveform output at t.p21 (25 or 29) is distorted. the voltage is called v tr1 (v tg1 or v tb1 ). next, decrease v16 gradually, and measure the voltage when the bottom of the waveform output at t.p29 (25 or 21) is distorted. the voltage is called v tr2 (v tg2 or v tb2 ). 2. voltage v t (v tr , v tg and v tb ) is calculated by the equation below: use relevant voltages, depending on the pin at which the waveform is output; speci?ally, use v tr1 when it is output at t.p21; v tg1 , at t.p25, and v tb , at t.p29. 3. after setting v tr (v tg or v tb ), increase the sg6 amplitude gradually, starting from 700mv. measure the amplitude when the top and bottom of the waveform output at t.p21 (25 or 29) starts becoming distorted synchronously. vimax maximum input measuring conditions are the same as those used above, except that the setting of v14 is changed to 2.5v as speci?d in supplementary table. 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 sg6 to pin 11 (7 or 3), and read the amplitude at output t.p21 (25 or 29). 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 v14 is changed to 4v. 2. measure the amplitude output at t.p21 (25 or 29). 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 waveform output at t.p21 (identical to output at t.p25 and t.p29.) 0.0 5.0 (v) v tr1 (v tg1 , v tb1 ) + v tr2 (v tg1 , v tb1 ) 2 v tr (v tg , v tb )= 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 electrical characteristics (cont.) symbol parameter test conditions limits unit test point (s) input external power supply (v ) pulse input sw11 r-ch sw7 g-ch sw3 b-ch v4 v14 v16 sw1 sw15 min. typ. max. p dcl pedestal voltage temperatere characteristics2 t.p.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 552 a - b sg5 -0.3 0 0.3 v dc v1th blk input threshold voltage t.p.29 t.p.25 t.p.21 b sg6 b sg6 b sg6 552 b sg7 b sg5 1.7 2.5 3.5 v dc
mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd blanking 5 v cr2 contrast control characteristics (minimum) d v cr2 contrast control relative characteristics (minimum) 1. measuring conditions are as given in supplementary table. the setting of v14 is changed to 1.0v. 2. measure the amplitude output at t.p21 (25 or 29). 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 cr2 =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, v8 and v12 to 4.0v. other conditions are as given in supplementary table. 2. measure the amplitude output at t.p21 (25 or 29). 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, v8 and v12 to 1.0v. other conditions are as given in supplementary table. 2. measure the amplitude output at t.p21 (25 or 29). the measured value is called v or5 (v og5 or v ob5 ). 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, v8, v12 and v14 to 3.0v. other conditions are as given in supplementary table. 2. measure the amplitude at t.p21 (25 or 29). the measured value is called v or6 (v og6 or v ob6 ). d v cr3 =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.p21 (25 or 29) 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 [mv] =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.p21 (25 or 29) 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' [mv] =v og7' -v ob7' =v ob7' -v or7' 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.p21 (25 or 29) 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'' [mv] =v og7'' -v ob7'' =v ob7'' -v or7'' f c1 frequency characteristics1 (f=50mhz) d f c1 frequency relative characteristics1 (f=50mhz) f c1 ' frequency characteristics1 (f=130mhz; maximum) d f c1 ' frequency relative characteristics1 (f=130mhz; maximum) 1. measuring conditions are as given in supplementary table. 2. sg2 and sg3 are input. the amplitude of the waveform output at t.p21 (25 or 29) is measured by the same procedure as in g v , d g v . v or4 (v og4 , v ob4 ) 0.7 [v p-p ] [v p-p ] v scr1 =20log v or6 (v og6 , v ob6 ) 0.7 [v p-p ] [v p-p ] v cr3 =20log
mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd blanking 6 3. supposing that the measured value is treated as amplitude v or1 (v og1 or v ob1 ) when sg1 is input, as v or8 (v og8 or v ob8 ) when sg2 is input, or as v or9 (v og9 or v ob9 ) when sg3 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=130mhz; maximum) d f c2 ' frequency relative characteristics2 (f=130mhz; maximum) measuring conditions and procedure are the same as described in f c1 , d f c1 , f c1' , d f c1' , except that contrast (v14) is turned down to 1.5v. c.t.1 crosstalk1 (f=50mhz) c.t.1' crosstalk1 (f=130mhz) 1. measuring conditions are as given in supplementary table. 2. input sg2 (or sg3) to pin 11 (r-ch) only, and then measure the waveform amplitude output at t.p21 (25 or 29). the measured value is called v or , v og and or v ob respectively. 3. crosstalk c.t. 1 is calculated by the equation below: c.t.2 crosstalk2 (f=50mhz) c.t.2' crosstalk2 (f=130mhz) 1. change the input pin from pin 11 (r-ch) to pin 7 (g-ch), and measure the output in the same way as in c.t.1, c.t.1'. 2. crosstalk c.t. 2 is calculated by the equation below: c.t.3 crosstalk3 (f=50mhz) c.t.3' crosstalk3 (f=130mhz) 1. change the input pin from pin 11 (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 is calculated by the equation below: tr pulse characteristics1 tf pulse characteristics2 1. measuring conditions are as given in supplementary table. 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: v14th clamp pulse threshold voltage 1. measuring conditions are as given in supplementary table. 2. turn down the sg5 input level gradually, monitoring the output (about 2.0 vdc). measure the sg5 input level when the output reaches 0v. w14 clamp pulse minimum width under the same conditions as given in v14th, reduce the sg5 pulse width gradually, monitoring the output. measure the sg5 pulse width when the output reaches 0v. p dch pedestal voltage temperatere characteristics1 p dcl pedestal voltage temperatere 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 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 sg7 (blanking period). 3. reduce the sg7 input level gradually, monitoring output. measure the sg7 level when the blanking period disappears. the measured value is called v1th. v or8 (v og8 , v ob8 ) [v p-p ] v or1 (v og1 , v ob1 ) [v p-p ] f c1 =20log v or9 (v og9 , v ob9 ) [v p-p ] v or1 (v og1 , v ob1 ) [v p-p ] f c1 '=20log 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') tr (nsec)= (tr2) 2 -(tr1) 2 tf (nsec)= (tf2) 2 -(tf1) 2 100% 90% 0% 10% tr tf
mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd blanking 7 input signal sg no. signals sg1 sine wave of amplitude 0.7v p-p (f=1mhz) sg2 sine wave with amplitude of 0.7v p-p (f=50mhz) sg3 sine wave with amplitude of 0.7v p-p (f=130mhz) sg4 pulse with amplitude of 0.7v p-p (f=30khz, duty=50%) pulses which are synchronous with sg4 pedestal portion sg5 pulses which are synchronous with standard video step waveform pedestal portion: amplitude, 2.0v p-p ; and pulse width, 3.0 m s (pulse width and amplitude sometimes variable) sg6 standard video step waveform video signal with amplitude of 0.7v p-p (f=30khz, amplitude sometimes variable) sg7 osd blk signals pulses which are synchronous with standard video step waveforms video portions: amplitude, 4.0v p-p ; and pulse width, 25 m s 0.7v p-p 0.7v p-p 2.0v p-p 3.0 m s 0v 3.0 m s 4v 0v
mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd blanking 8 test circuit typical characteristics units resistance : w capacitance : f gnd gnd nc gnd v cc v cc gnd v cc gnd v cc gnd 13 2 4 59 81012 11 13 14 6 7 28 26 27 25 24 20 21 19 17 18 16 23 22 680 2.2 m v16 v14 sg4 v12 v8 v4 sg1 sg2 sg3 sg4 sg6 100 m 0.01 m b a swa b a sw15 29 15 30 680 2.2 m 680 2.2 m b a sg7 sw1 b a sw3 0.01 m b a 0.01 m b a 0.01 m sw11 sw7 a 12v v cc v cc M52733SP ambient temperature ta ( c) 0 25 50 75 100 125 400 800 1200 1800 150 -20 1400 thermal derating (maximum rating) power dissipation p d (mw) 85 200 600 1000 1600
mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd blanking 9 application example 1 16 110v dc clamp crt 12v clamp input (b) input (g) input (r) 0 to 5v 0 to 5v 0 to 5v 200 nc 13 2 4 59 81012 11 13 15 6 7 30 26 28 25 24 20 21 19 17 18 23 22 14 29 27 680 14k 200 680 14k 200 680 14k osd in 50k 50k 50k 0 to 5v 0 to 5v osd blk in units resistance : w capacitance : f M52733SP
mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd blanking 10 application example 2 16 110v dc clamp crt 12v clamp input (b) input (g) input (r) 0 to 5v 0 to 5v 0 to 5v nc 13 2 4 59 81012 11 13 15 6 7 30 26 28 25 24 20 21 19 17 18 23 22 14 29 27 680 680 680 osd in 0 to 5v 0 to 5v osd blk in units resistance : w capacitance : f M52733SP
mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd blanking 11 description of pin pin no. name dc voltage (v ) peripheral circuit of pins description of function 1 osd blk in - input pulses of minimum 3v. connected to gnd if not used. 2 6 10 v cc (b-ch) v cc (g-ch) v cc (r-ch) 12 - apply equivalent voltage to 3 channels. 3 7 11 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 8 12 14 subcontrast (b) subcontrast (g) subcontrast (r) main contrast 2.5 use at maximum 5v for stable operation. 5, 26 9, 22 13, 17 30 gnd (b-ch) gnd (g-ch) gnd (r-ch) gnd gnd - 15 cp in - input pulses of minimum 2.5v. input at low impedance. 2.5v 0.9ma v cc gnd b-ch g-ch 1 1v maximum 3 to 5v v cc 2.5v 0.24ma cp gnd 2k 2k 2.5v 1.5k 23.5k v cc gnd v cc 2.2v gnd 41k 18 0.5v maximum 2.5v minimum
mitsubishi ics (monitor) M52733SP 3-channel video amplification with osd blanking 12 description of pin ( cont .) pin no. name dc voltage (v ) peripheral circuit of pins description of function 16 main brightness - 19 23 27 hold (r) hold (g) hold (b) variable a capacity is needed on the gnd side. 20 24 28 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. 21 25 29 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. b-ch g-ch v cc gnd 19 20.3k v cc gnd 1k 0.2ma pin 21 pin 25 pin 29 pin 20 pin 24 pin 28 50

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