mitsumi 3-input 2-output 3-circuit video switch mm1238 3-input 2-output 3-circuit video switch monolithic ic mm1238 outline this ic is a video switch developed for large and medium-sized high quality tvs, with 3-input and 2-output circuits. it is suitable for bs, jsb, cs or m-n (muse ntsc conversion) comparator switching. the bs-cs decoder can be used as a w decoder. features 1. one of the two video signal outputs is for external output, and has a 6db amp, 75 , 1v p - p 2. input impedance video circuits 1~3 15k audio circuits 1~3 68k 3. crosstalk video - 60db (at 4.43mhz) audio - 80db ( at 1khz ) video : audio - 70db ( at 100khz ) 4. frequency response 10mhz (6db, 75 , amp only, 7mhz) 5. power supply voltage 8.0v ~ 13.0v package sdip-22a (MM1238XD) applications 1. tv 2. free-standing vcr 3. other video equipment pin assignment sdip-22p 1369 24 58 7 10 11 22 18 15 21 19 17 16 14 20 12 13 pin no. pin name function pin no. pin name function 1 l in 1 audio l in 1 12 c21 sw2 control 2 v in 1 video in1 13 r out 2 audio r out 2 3 r in 1 audio r in 1 14 v out 2 video out2 4 c11 sw1 control 15 l out 2 audio l out 2 5 l in 2 audio l in 2 16 gnd gnd 6 v in 2 video in2 17 c22 sw2 control 7 r in 2 audio r in 2 18 v cc power supply 8 c12 sw1 control 19 r out 1 audio r out 1 9 l in 3 audio l in 3 20 l out 1 audio l out 1 10 v in 3 video in3 21 v out 1 video out1 11 r in 3 audio r in 3 22 sag sag pin
mitsumi 3-input 2-output 3-circuit video switch mm1238 block diagram control input output signal c11 c12 v out 1r out 1l out 1 l l mute mute mute l h vin1 rin1 lin1 h l vin2 rin2 lin2 h h vin3 rin3 lin3 control input output signal c21 c22 v out 2r out 2l out 2 l l mute mute mute l h vin1 rin1 lin1 h l vin2 rin2 lin2 h h vin3 rin3 lin3 sw logic absolute maximum ratings (ta=25c) item symbol ratings units storage temperature t stg - 40~+125 c operating temperature t opr - 20~+75 c power supply voltage v cc 15 v allowable loss pd 800 mw
mitsumi 3-input 2-output 3-circuit video switch mm1238 electrical characteristics (except where noted otherwise, ta=25c, v cc = 8v~13v) item symbol measurement measurement conditions min. typ. max. units circuit operating power supply voltage v cc v cc 8.0 13.0 v consumption current i cc 1v cc =9v 22.0 29.0 ma i cc 2v cc =12v 25.0 33.0 ma v out 1 output voltage gain g v 1 tp7 sg2 : sine wave 1v p - p , 0.1mhz 5.7 6.2 6.7 db frequency characteristic f v 1 tp7 sg2 : sweep signal 1v p - p 7mhz/0.1mhz - 1.0 0 1.0 db differential gain dg1 tp8 sg2 : staircase wave 1v p - p apl=10, 50, 90% 03% differential phase dp1 tp8 sg2 : staircase wave 1v p - p apl=10, 50, 90% 0 3 deg r out 1 output voltage gain g r 1 tp5 sg3 : sine wave 2.5v p - p , 1khz - 0.5 0 0.5 db total harmonic distortion thd r 1 tp5 sg3 : sine wave 2.5v p - p , 1khz 0.01 0.1 % mute noise v nm 1 tp5 15khz band during mute select 180 vrms output noise voltage v nr 1 tp5 15khz band during pin select 3 50 vrms l out 1 output voltage gain g l 1 tp6 sg1 : sine wave 2.5v p - p , 1khz - 0.5 0 0.5 db total harmonic distortion thd l 1 tp6 sg1 : sine wave 2.5v p - p , 1khz 0.01 0.1 % mute noise v nm 2 tp6 15khz band during mute select 180 vrms output noise voltage v nl 1 tp6 15khz band during pin select 3 50 vrms v out 2 output voltage gain gv2 tp2 sg2 : sine wave 1v p - p , 0.1mhz - 0.5 0 0.5 db frequency characteristic fv2 tp2 sg2 : sweep signal 1v p - p 10mhz/0.1mhz - 1.0 0 1.0 db differential gain dg2 tp3 sg2 : staircase wave 1v p - p apl=10, 50, 90% 03% differential phase dp2 tp3 sg2 : staircase wave 1v p - p apl=10, 50, 90% 0 3 deg r out 2 output voltage gain g r 2 tp1 sg3 : sine wave 2.5v p - p , 1khz - 0.5 0 0.5 db total harmonic distortion thd r 2 tp1 sg3 : sine wave 2.5v p - p , 1khz 0.01 0.1 % mute noise v nm 3 tp1 15khz band during mute select 180 vrms output noise voltage v nr 2 tp1 15khz band during pin select 3 50 vrms l out 2 output voltage gain g l 2 tp4 sg1 : sine wave 2.5v p - p , 1khz - 0.5 0 0.5 db total harmonic distortion thd l 2 tp4 sg1 : sine wave 2.5v p - p , 1khz 0.01 0.1 % mute noise v nm 4 tp4 15khz band during mute select 180 vrms output noise voltage v nr 2 tp4 15khz band during pin select 3 50 vrms output offset voltage v out 1 v off 1 tp7 v out 1 pin dc level difference during switching 0 30 mv v out 2 v off 2 tp2 v out 2 pin dc level difference during switching 0 15 mv r out 1 v off 3 tp5 r out 1 pin dc level difference during switching 0 15 mv r out 2 v off 4 tp1 r out 2 pin dc level difference during switching 0 15 mv l out 1 v off 5 tp6 l out 1 pin dc level difference during switching 0 15 mv l out 2 v off 6 tp4 l out 2 pin dc level difference during switching 0 15 mv
mitsumi 3-input 2-output 3-circuit video switch mm1238 input impedance v in r iv v in 1~v in 315k r in r ir r in 1~r in 368k l in r il l in 1~l in 368k output impedance v out v ov v out 250 r out v or r out 1 and r out 250 l out v ol l out 1 and l out 250 crosstalk v in v out ct vv sg2 : 1v p - p , 4.43mhz * 1 - 60 - 50 db r in r out ct rr sg3 : 2.5v p - p , 1khz * 2 - 80 - 70 db l in l out ct ll sg1 : 2.5v p - p , 1khz * 3 - 80 - 70 db v in r out ct rv sg2 : 1v p - p , 100khz * 4 - 70 - 60 db v in l out ct lv sg2 : 1v p - p , 100khz * 5 - 70 - 60 db switch input voltage sw input voltage h v ih switching h level for each ic sw 2.1 v sw input voltage l v il switching l level for each ic sw 0.7 v input dynamic range v in v out d1 v cc =12v, sg1 : sine wave, 1khz 2.6 v p - p v cc =12v, sg2 : sine wave, 1khz r in r out d2 total higher harmonic 2.0 vrms distortion=0.5% v cc =12v, sg3 : sine wave, 1khz l in l out d3 total higher harmonic 2.0 vrms distortion=0.5% * 1 crosstalk (v in v out ) input a 1v p - p , 4.43mhz sine wave to sg2. obtain c tvv using the following formula given output amplitude for combinations other than those below for sw control pin as v o 1, and for the combinations below as v o 2. c tvv =20 log (v o 2/v o 1) db 1. c tvv 1 measuring pin switch status s2 v1 v2 v3 v4 alllh ahl lh ahhlh bllhl tp8 blhhl bhhhl cllhh clhhh chlhh 2. c tvv 2 measuring pin switch status s2 v1 v2 v3 v4 alhll alhhl alhhh bhl l l tp3 bhl lh bhlhh chhl l chhlh chhhl
mitsumi 3-input 2-output 3-circuit video switch mm1238 * 2 crosstalk (r in r out ) input a 2.5v p - p , 1khz sine wave to sg3. obtain c trr using the following formula given output amplitude for combinations other than those below for sw control pin as v o 3, and for the combinations below as v o 4. c trr =20 log (v o 4/v o 3) db 1. c trr 1 measuring pin switch status s3 v1 v2 v3 v4 alllh ahl lh ahhlh bllhl tp5 blhhl bhhhl cllhh clhhh chlhh 2. c trr 2 measuring pin switch status s3 v1 v2 v3 v4 alhll alhhl a lhhh bhlll tp1 bhl lh bhlhh chhl l chhlh chhhl * 3 crosstalk (l in l out ) input a 2.5v p - p , 1khz sine wave to sg3. obtain c tll using the following formula given output amplitude for combinations other than those below for sw control pin as v o 5, and for the combinations below as v o 6. c tll =20 log (v o 6/v o 5) db 1. c tll 1 measuring pin switch status s1 v1 v2 v3 v4 alllh ahl lh ahhlh bllhl tp6 blhhl bhhhl cllhh clhhh chlhh 2. c tll 2 measuring pin switch status s1 v1 v2 v3 v4 alhll alhhl a lhhh bhlll tp4 bhl lh bhlhh chhl l chhlh chhhl
mitsumi 3-input 2-output 3-circuit video switch mm1238 * 4 crosstalk (v in -r out , l out ) input a 1vp-p, 100khz sine wave to sg2. obtain c trv (c tlv ) using the following formula given output amplitude for combinations other than those below for sw control pin as v o 7, and for the combinations below as v o 8. c trv (c tlv )=20 log (v o 8/v o 7) db 1. c trv measuring pin switch status s2 v1 v2 v3 v4 alhlh tp5 bhlhl chhhh alhlh tp1 bhlhl chhhh 2. c tlv measuring pin switch status s2 v1 v2 v3 v4 alhlh tp6 bhlhl chhhh alhlh tp4 bhlhl chhhh measuring circuit
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