mitsumi 3-input 1-output video switch (with y-c mix) MM1188 3-input 1-output video switch (with y-c mix) monolithic ic MM1188 outline this is a 3-input, 1-output video switch ic for video signal switching. of the 3 inputs, one has an input pin that supports s input, and there is a built-in mixing circuit. features 1. built-in mixing circuit and input pin for s input 2. built-in 6db amp 3. clamp function (in1 - y, in2, in3) 4. mute function 5. current consumption 12.5ma typ. 6. operating power supply voltage range 8~13v 7. frequency response 10mhz 8. crosstalk 70db (at 4.43mhz) package sip-9b (MM1188xs) applications 1. tv 2. vcr, etc. block diagram control input truth table sw1 sw2 out l l in1 h l in2 - h in3
mitsumi 3-input 1-output video switch (with y-c mix) MM1188 pin description pin no. pin name function internal equivalent circuit diagram 1 in3 input 3 9 in2 input 2 3 sw1 switch 1 8 sw2 switch 2 6 in1-y input 1 (luminance signal or composite signal) 4 out output 2 v cc power supply 5 gnd ground
mitsumi 3-input 1-output video switch (with y-c mix) MM1188 7 in1-c input 1 (chroma signal) absolute maximum ratings (ta=25c) electrical characteristics (except where noted otherwise, ta=25c, v cc =12.0v) 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 1100 mw item symbol measurement conditions min. typ. max. units operating power supply voltage range v cc 8.0 13.0 v consumption current id refer to measuring circuit 8.8 12.5 16.5 ma voltage gain g v refer to measuring circuit 5.5 6.0 6.5 db frequency characteristic f c refer to measuring circuit - 10+1db differential gain dg refer to measuring circuit 0 3 % differential phase dp refer to measuring circuit 0 3 deg output offset voltage voff refer to measuring circuit 60 mv crosstalk c t refer to measuring circuit - 70 - 60 db switch 1 input voltage h v ih 1 refer to measuring circuit 2.3 v switch 1 input voltage l v il 1 refer to measuring circuit 0.9 v switch 2 input voltage h v ih 2 refer to measuring circuit 2.3 v switch 2 input voltage l v il 2 refer to measuring circuit 0.9 v in1-c input dynamic range a dr a refer to measuring circuit 1.0 v p - p b dr b refer to measuring circuit 1.2 v p - p in1-y, in2, in3 input dynamic range dr c refer to measuring circuit 1.5 v p - p in1-c input impedance ri 15 k in1-c pin voltage v i1c s1~s6=2 4.0 4.5 5.0 v in1-y pin voltage v i1y s1~s6=2 4.1 4.6 5.1 v in2 pin voltage v i 2 s1~s4=s6=2, s5=1 4.1 4.6 5.1 v in3 pin voltage v i 3 s1~s5=2, s6=1 4.1 4.6 5.1 v out pin voltage vo s1~s6=2 3.5 4.0 4.5 v
mitsumi 3-input 1-output video switch (with y-c mix) MM1188 measuring procedures (except where noted otherwise, v cc =12.0v, vc1=v cc , vc2=0v) item symbol switch state measuring procedure s1 s2 s3 s4 s5 s6 consumption id 222222 current 122222 212222 voltage gain g v 221212 222111 222121 122222 212222 frequency f c 221212 characteristic 222111 222121 212222 differential gain dg 221212 222111 222121 212222 differential phase dp 221212 222111 222121 222222 output offset voff 222212 voltage 222211 122212 122221 122211 212212 212221 crosstalk c t 212211 221222 221221 221211 222122 222112 222212 switch 1 input v ih 1 voltage h switch 1 input v il 1 voltage l 222221 switch 2 input v ih 2 voltage h switch 2 input v il 2 voltage l 312222 a dr a in1-c input dynamic 312222 range b dr b in1-y, in2, in3 212222 input dynamic dr c 221212 range 222111 connect a dc ammeter to the v cc pin and measure. the ammeter is shorted for use in subsequent measurements. input a 1.0v p - p , 100khz sine wave to sg, and obtain gv from the following formula given tp1 voltage as v1 and tp3 voltage as v2. gv=20log (v2/v1) db for the above g v measurement, given tp3 voltage for 10mhz as v3, f c is obtained from the following formula. f c =20log (v3/v2) db input a 1.0v p - p staircase wave to sg, and measure differential gain at tp3. * 1 apl=10~90% proceed as for dg, and measure differential phase. * 2 measure the dc voltage difference of each switch status at tp2. assume vc1=2.3v, vc2=0.9v. input a 1.0v p - p , 4.43mhz sine wave to sg, and given tp3 voltage during signal output as v4, switch s5 and s6, and given tp3 voltage for output off as v5, c t is obtained from the following formula. c t =20log (v5/v4) db impress an optional dc voltage on tp7 and tp8. gradually raise from vc1=0v. tp4 voltage when tp8 voltage is output on tp2 is v ih 1. gradually lower from vc1=v cc . tp4 voltage when tp7 voltage is output on tp2 is v il 1. impress an optional dc voltage on tp7 and tp9. gradually raise from vc1=0v. tp5 voltage when tp9 voltage is output on tp2 is v ih 2. gradually lower from vc1=v cc . tp5 voltage when tp7 voltage is output on tp2 is v il 2. input a luminance signal as shown in figure 1 to sg1, and a chroma signal as shown in figure 2 to sg2. change the chroma signal amplitude and measure the maximum amplitude where there is no waveform distortion at tp3 and convert to input amplitude. input a luminance signal as shown in figure 3 to sg1, and a chroma signal as shown in figure 2 to sg2. change the chroma signal amplitude and measure the maximum amplitude where there is no waveform distortion at tp3 and convert to input amplitude. input a sine wave to sg1. measure the maximum amplitude where there is no waveform distortion at tp3 and convert to input amplitude.
mitsumi 3-input 1-output video switch (with y-c mix) MM1188 note : * 1 * 2 measurement of in1-c and in1-y mixed differential gain and differential phase is as follows. switch status : s1=3, s2=1, s3=s4=s5=s6=2 measuring procedure : input a 1.0v p - p staircase wave signal (without chroma signal) to sg1, and a chroma signal to sg2. measure tp3 differential gain and differential phase. 0.286v p-p (40ire) sync signal chroma signal variable amplitude 0.714v p - p (100ire) 0.286v p - p (40ire) 1.0v p - p (140ire) luminance signal sync signal figure 1 figure 3 figure 2 measuring circuit
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