rev.1.0, sep.19.2003, page 1 of 9 M51348AVP vif/sif for low supply voltage rej03f0062-0100z rev.1.0 sep.19.2003 description the m51348 is a low supply voltage, low power semiconductor ic for compact tv sets which includes video intermediate frequency (vif), sound intermediate frequency (sif), and synchronous separation (sync. sep.) functions. an if amplifier. video detector (with simultaneous sound detector), if agc, rf agc (forward type), aft, sif limiter amplifier, fm detector electronic volume, and synchronous separation function are provided. the package is of the 24-pin mini-flat type. the m513848afp has better dg and dp but less vif input sensitivity than the m51348fp. features ? this ic can be used with very low supply voltage and low power and it comes in a mini-flat package to suit the compact tv or compact tv tuner. minimum operating power voltage 3v consuming current 16ma (when used with 4.5v supply voltage) ? current automatically decreases to ensure power saving when a strong signal is received, when the electronic volume control is at its lowest. ? there are separate gnd pins for the vif/sync. sep. circuit and for the sif circuit so that cross-interference is reduced. ? it is possible to adjust the video detector output amplitude by controlling the 24-pin voltage externally. ? the agc works fast because of the 2-stage agc filter. agc has high stability against outside noise due to the agc noise canceller. ? emitter input circuit is used in sync. sep. output is taken from the sync. positive polarity. application portable b/w, color tv recommend operating condition supply voltage range 3.0v to 6.0v rated supply voltage 4.5v
M51348AVP rev.1.0, sep.19.2003, page 2 of 9 block diagram &pin configuration audio output sif gnd electronic vr dc f/b fm detector in sif input limiter output sif vcc aft output vif gnd video output if input lld coil if input lld coil vif vcc aft coil rf agc delay sync sep input rf agc output sync output agc filter ii if agc adjust agc filter i buffer fm(vr) det rf agc (forward) sync. sep. 13 14 15 16 17 18 19 20 21 22 23 24 12 11 10 9 8 7 6 5 4 3 2 1 video amp. if agc det. video det. limiter aft 1st amp. 2nd amp. .
M51348AVP rev.1.0, sep.19.2003, page 3 of 9 absolute maximum ratings (ta=25 c,unless otherwise noted.) parameter symbol ratings unit note supply voltage(1) vcc(5) 7.5 v supply voltage(2) vcc(9) 7.5 v power dissipation pd 360 mw operating temperature topr - 20 to +75 c storage temperature tstg - 40 to +125 c temperature characteristics ambient temperature ta( o c) 0 100 200 300 400 500 0 25 50 75 100 125 power dissipation(mw)
M51348AVP rev.1.0, sep.19.2003, page 4 of 9 electrical characteristics ac characteristic (vif) (ta = 25c, unless otherwise noted.) limits no parameter symbol test point input test conditions min typ. max unit 1 circuit current i vif 5 ? input current with 4.5v in 5. 10 15 20 ma 2 video detector output vodet 18 sg1 90db output amplitude. 0.7 0.9 1.1 vp- p 3 input sensitivity vinmin 18 sg1 variable input level when output amplitude reaches 3db less than vo det. ? 45 55 db 4 maximum allowable input vinmax 18 sg1 variable input level when output amplitude reaches 3db more than vo det. 100 111 ? db 5 video frequency characteristic bw 18 sg2 bw is defined as f1- f2 whenoutput amplitude reaches - 3db less than when f1- f2=1mhz. 6 7 ? mhz 6 rf agc maximum voltage v 3h 3 sg4 90db output dc voltage with 4.5v in 4. 3.2 3.7 ? vo- p 7 rf agc minimum voltage v 3l 3 sg4 90db output dc voltage with 2v in 4. ? 0 0.2 vo- p 8 aft detector sensitivity 17 sg5 90db refer to note1 30 50 ? mv /khz 9 dc voltage at aft mute on v m17 17 sg5 90db output dc voltage with 0v in 21. 2 2.25 2.5 v 10 aft center voltage v ac 17 ? output dc voltage with 0v in 2. 0.5 1.4 2.5 v 11 sync.sep.output voltage vsync 23 sg1 90db output amplitude. 3.5 3.8 4.1 vp-p 12 operating voltage v vif 5 sg1 90db must be operated. 3 ? 6 v 13 video detector output at high or low voltage vohdet 18 sg1 90db output amplitude with 6.0v or 3.0v in 5. 0.95 1.25 1.55 vp-p
M51348AVP rev.1.0, sep.19.2003, page 5 of 9 ac characteristic (sif) limits no parameter symbol test point input test conditions min typ. max unit 1 circuit current i sif 9 ? input current with 4.5v in 9. 2.2 3.2 4.2 ma 2 detector output voltage vo af 13 sg6 90db output amplitude. 200 240 280 mvrms 3 input limiting sensitivity vimin 13 sg6 variable input level when input amplitude reaches - 3db below vo af . ? 32 49 db 4 am rejection ratio amr 13 sg7 90db where v am denotes output amplitude, vo af (mvrms) amr=20log v am (mvrms) 40 53 ? db 5 bandwidth bw(s) 13 sg8 90db refer to note2. 100 130 ? khz vr1 3.0 3.9 4.8 6 electronic volume control characteristic vr2 13 sg6 90db ratio of output amplitude and vo af when 14 is changed from 4.0v to 1.0v. ? -53 -45 db 7 distortion thd 13 sg9 90db measured by distortion meter. ? 0.4 1.0 % 8 operating voltage v sif 9 sg6 90db must be operated. 3 ? 6 v voh af 380 430 480 9 detector output voltage at high or low voltage vol af 13 sg6 90db output amplitude with 6.0v or 3.0v in 9 53 64 75 mvrms
M51348AVP rev.1.0, sep.19.2003, page 6 of 9 test circuit 9 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 3.3k 0.33u 0.01u 0.01u 2 4 3 5 2.2u 10k 33u 0.01u 1:1 0.01u 50 33u 0.01u 0.01u 50 2.2u 0.01u 4.7k 13 0.01u 14 430 27p 120 cda 4.5mc20 17 390k 390k 0.01u 3.3k 18 180k 4.7u lld 21 0.01u 470 820p 20k 23 M51348AVP sif in vif in
M51348AVP rev.1.0, sep.19.2003, page 7 of 9 precaution concerning electical charactristics 1) voltage supplied (pins 5 and 9)is 4.5v unless otherwise noted in the conditions column. 2) vif input amplitude (vin)is the amplitude of vfi in in the circuit below.feed sg1 90db signal into the circuit below,and measure the dc voltage v2 at 2.set the circuit for ac voltage measurement and adjust the input amplitude,monitoring dc voltage at 2 ,until it reaches the level of v2.90db is defined as the input amplitude at that time. 50 ? 0.01 f 6 7 8 0.01 f vif in 3) lnput signals are shown below. sg1 fo=58.75mhz fm=20khz 77.8%am sg2 f1=58.75mhz vi=90db cw f2=53 5mhz vi=70db cw sg3 fo=58.75mhz linearity 10step signal (87.5%video modulation) sg4 fo=58.75mhz cw sg5 fo=58.75 5mhz cw(sweep) sg6 fo=4.5mhz fm 25khz dev fm=400hz sg7 fo=4.5mhz am 30% fm=400hz sg8 fo=4.5mh 200kh fm 7.5khz dev fm=400hz sg9 fo=4.5mh fm 7.5khz dev fm=400hz 4) adjustment of lld coil 1. feed sg5 vi=90db into vif in. 2. aft coil must be shifted to detuned condition. 3. feed outside voltage to 2 and check tank response at 18 as shown in the figure below. 4. adjust lld coil so that peak comes at 58.75mhz. v18 f 0.6vp-p 58.75mhz dc level with no signal
M51348AVP rev.1.0, sep.19.2003, page 8 of 9 5) adjustment of aft coil 1. feed sg5 vi=90db in vif in. 2. measure the voltage at pin 17 and adjust aft coil as shown in the figure below. v17 f 2.25v 58.75mhz note1 aft detector sensitivity " " v17 f 2.25v 58.75mhz 3v 1.5v where f a denotes a frequency at a and f b at b. f b (khz)-f a (khz) 1500mv = note2 bandwidth "bw(s)" first,define vo(det)fm as the output amplitude when the signal fo=4.5mhz,fm=400hz and fdev=7.5khz is given to sif in. decrease and increase the frequency to until the output amplitude reaches - 3db than vo(det)fm.these are defined as fo l and fo h respectively.bandwidth is defined as bw(s) = foh- fol
M51348AVP rev.1.0, sep.19.2003, page 9 of 9 package dimensions ssop24-p-275-0.65 weight(g) ? jedec code 0.12 eiaj package code lead material alloy 42 24p2e-a plastic 24pin 275mil ssop symbol min nom max a a 2 b c d e l l 1 y dimension in millimeters h e a 1 i 2 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? .17 0 0 .13 0 .7 7 .5 5 .4 7 .3 0 .0 1 .1 0 .15 1 .22 0 .15 0 .8 7 .6 5 .65 0 .6 7 .5 0 .0 1 .0 7 .2 0 .45 1 .32 0 .2 0 .9 7 .7 5 .8 7 .7 0 .1 0 b 2 35 0. 0 10 e e 1 24 13 12 1 h e e d e y f a a 2 a 1 l 1 l c e b 2 e 1 i 2 recommended mount pad detail f detail g z z 1 x z 1 0.325 0.475 0.13 z g b x m mmp
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