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ics for vcr 1 AN3275SB cm detection ic for vcrs in the north american market n overview the AN3275SB is an ic which detects both a low luminance of video signal and a low sound amplitude based on that is adle inc.'s patent of the cm detection technology. using this ic and a free memory area in a microcomputer, you can easily carry out a cm detection for vcrs used in the north america. n features video black detection low sound detection generation of various masking pulses (detecting h-mask, v-mask and envelope) generation of the pulse (clr pulse) for an event latch usable for commercial advance, movie ad- vance and ca-lite n applications stand-alone vcr n block diagram note) is a trademark registered by srt, inc., invented by jerry iggulden who closed a licensing contract under the cooperation of arthur d. little enterprises, inc. ssop036-p-0450a unit: mm 8.40.3 0.5 0.10.1 11.930.3 2.850.2 15.20.3 36 19 118 0.30.11 0.8 1.300.25 1.300.25 seating plane 0.2 +0.10 C0.05 gnd 36 ca/ma sel 35 34 v in 33 c trap 32 cl cap 31 ca v fil 30 ca v lev 29 ma v fil 28 ma v lev 27 n.c. 26 v det 25 sync fil 24 vs out 23 vmw 22 vmd 21 envh det 20 envl det v cc hmw ra in pa in ma v lev ma a fil ca a fil ca a lev a det clr in clr out env det pb fm in hsw in env adj. 19 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 clamp clamp mm3 h-dl mm4 h-wd lpf amp. 2 sync. sepa. amp. black video detect v-sync. sepa. non-audio detect audio 1 latch 2 video 1 latch 2 counter counter env detector mix. mm1 v-dl mm2 v-w id bp h mask lpf3 v mask h mask v mask env mask ma ma ca ca e/v mask e/v mask e/v mask ma ca
AN3275SB ics for vcr 2 n pin descriptions pin no. symbol description 1v cc supply voltage (5 v typ.) 2 hmw h-mask width period adjustment 3 ra in audio recording input 4 pa in audio playback input 5 a fil audio filter 6 ma a lev movie advance audio detection level adjustment 7 ma a fil movie advance audio filter 8 ca a fil commercial advance audio filter 9 ca a lev commercial advance audio detection level adjustment 10 a dc audio dc 11 a det audio detection latch output y to a microcomputer 12 clr in e/v mask pulse input 13 clr out e/v mask pulse output 14 env det pb fm envelope detection filter 15 pb fm in pb fm envelope input 16 head head amp. switch pulse input amp sw 17 env adj. env mask level adjustment 18 v det out video detection delay adjustment pin no. symbol description 19 env l det pb fm envelope peak detection (below) 20 env h det pb fm envelope peak detection (upper) 21 vmd v-mask time delay adjustment 22 vmw v-mask width period adjustment 23 vs out vertical sync. signal output 24 sync fil vertical sync. signal separation filter 25 v det black picture detection output to a microcomputer 26 n.c no connection 27 ma v lev ma video detection level adjustment 28 ma v fil ma video filter control 29 ca v lev ca video detection level adjustment 30 ca v fil ca video filter control 31 cl cap capacitor for clamping 32 c trap chroma trap filter 33 vin video input 34 a ref audio reference 35 ca/ma sel selection of ca, ma (ca-lite) y 36 gnd signal processing circuit gnd n absolute maximum ratings parameter symbol rating unit supply voltage v cc 5.5 v supply current i cc 35 ma power dissipation * 2 p d 450 mw operating ambient temperature * 1 t opr - 20 to + 70 c storage temperature * 1 t stg - 55 to + 125 c note) * 1: except for the power dissipation, operating ambient temperature, and storage temperature, all ratings are for t a = 25 c. * 2: the power dissipation shown is for the ic package at t a = 70 c.
ics for vcr AN3275SB 3 parameter symbol conditions min typ max unit supply current i cc ma mode ? 21 28 ma ca mode hold voltage v 35h ? 3.5 ? 5.0 v cl slp mode hold voltage v 35m ? 1.75 ? 3.0 v cl sp,ma mode hold voltage v 35l ? 0 ? 1.25 v pin 32 output impedance r 32 ? 1 830 2 030 2 230 w pin 5 output impedance r 5 ? 4 505 5 005 5 505 w vss pulse high level v 23h outoput 23, with 10 k w to gnd 4.0 ?? v vss pulse low level v 23l outoput 23, with 10 k w to v cc ?? 0.5 v clr pulse high level v 13h outoput 13, with 10 k w to gnd 4.0 ?? v clr pulse low level v 13l outoput 13, with 10 k w to v cc ?? 0.5 v video det. output high level v 25h outoput 25, with 10 k w to gnd 4.0 ?? v video det. output low level v 25l outoput 25, with 10 k w to v cc ?? 0.5 v audio det. output high level v 11h outoput 11, with 10 k w to gnd 4.0 ?? v audio det. output low level v 11l outoput 11, with 10 k w to v cc ?? 0.5 v black det. level 1 (ca mode) * 1 v det1 input 33, output 25 10.5 13 15.5 (ire) video signal: 140ire = 2.1 v[p-p] black det. level 2 (ca mode) * 1 v det1 input 33, output 25 8.5 11 13.5 (ire) video signal: 140ire = 2.1 v[p-p] non-audio detection level 1 a det1 input 3, output 11 56 76 96 mv[p-p] (ca mode) pin 7: 47 k w to gnd, f in = 1.0 khz non-audio detection level 2 a det2 input 4, output 11 1.8 3.6 5.4 mv[p-p] (ma mode) pin 7: 47 k w to gnd, f in = 5 khz black detection adjustment v ad1 input 33, output 25, pin 29 = dc, 7 ? 28 (ire) range 1 * 1 sweep: 140 ire = 2.1v[p-p] black detection adjustment v ad2 input 33, output 25, pin 27 = dc, 7 ? 28 (ire) range 2 * 1 sweep: 140 ire = 2.1v[p-p] non-audio a ad1 input 3, output 11 50 ? 100 mv[p-p] detection adjustment range 1 pin 9 = dc, sweep, f in = 1.0 khz non-audio a ad2 input 4, output 11 2.4 ? 5.2 mv[p-p] detection adjustment range 2 pin 6 = dc, sweep, f in = 5 khz v-mask delay t vd input 33, output 13 1.65 1.95 2.25 ms delay from vss: 0.1 uf, pin 21: 0.1 m f v-mask width t vw input 33, output 13, pin 22: 0.22 m f 11 12.5 14 ms parameter symbol range unit supply voltage v cc 4.75 to 5.25 v n recommended operating range n electrical characteristics at v cc = 5.0 v, t a = 25 c note) * 1: the unit which stands for the ratio of the video signal amplitude to a total amplitude. 140ire = 2.1 v[p-p]
AN3275SB ics for vcr 4 parameter symbol conditions min typ max unit h-mask delay t hd input 33, output 30, delay from hss 10.5 12.5 14.5 m s h-mask width t hw input 33, output 30, pin 2: 2 700 pf 30 34 38 m s env detection level se input 15, output 13, - 5.5 - 7.5 - 9.5 db v in = 200 mv[p-p] n electrical characteristics at v cc = 5.0 v, t a = 25 c (continued) note) * 1: the unit which stands for the ratio of the video signal amplitude to a total amplitude. 140ire = 2.1 v[p-p] design reference data note) the characteristics below are theoretical values based on the ic design and are not guaranteed. parameter symbol conditions min typ max unit black detection block pin33 sync. dc level v sy33 input 33, output 33 ? 1.8 ? v pin 33: 1.0 m f, 140ire = 2.1 v[p-p] chroma trap frequency f v2 input 33, output 30 ?- 35 ? db characteristics ratio of pin 30 = 500 khz to 3.58 mhz lpf2 frequency characteristics f v3 input 33, output 30 ?- 3.0 ? db ratio of pin 30 = 500 khz to 1.0 mhz pin 30 output dynamic range * 1 v 30 input 33, output 30 ? 30 ? (ire) pin 30: 10 k w to gnd pin 30 pedestal dc level v pd30 input 33, output 30 ? 1.6 ? v pin 30: 10 k w to gnd pin 28 output dynamic range * 1 v 28 input 33, output 28 ? 30 ? (ire) pin 28: 10 k w to gnd pin 28 pedestal dc level v pd28 input 33, output 28 ? 1.6 ? v pin 28: 10 k w to gnd masking level dc offset d v pd input 33, output 28 - 2.0 0.0 0.2 v pin 28: 10 k w to gnd, pin 2 = gnd black detection hysteresis d v vcn input 28, output 18 105 130 155 mv[p-p] pin 28 = triangular wave hss,vss block sync. separation minimum input s hss input 33, output 24 ? 40 ? % sensitivity pin 33: v in = 2.1 v[p-p], white 100% hss front edge delay t dhss hss front edge delay from ? 1.0 ?m s input 33, output 24, pin 33 vss front edge delay t dvss input 33, output 23 ? 25 ?m s vss pulse width t wvss input 33, output 23 ? 215 ?m s non-audio detection block lpf3 frequency characteristics f a1 input 4, output 7 ?- 3 ? db ratio of pin 7 = 5 khz to 15 khz pin 7 output dynamic range d v 7 input 4, output 7 ? 5.0 ? mv[p-p]
ics for vcr AN3275SB 5 pin no. equivalent circuit impedance signal waveform dc (v) 1v cc ?? 5.0 2 hmw current output ? 3 ra in (ca) 10 k w 2.3 n electrical characteristics at v cc = 5.0 v, t a = 25 c (continued) design reference data (continued) note) the characteristics below are theoretical values based on the ic design and are not guaranteed. parameter symbol conditions min typ max unit envelope detection block env detection adjustment range e ad input 15, output 13 - 3 ?+ 3db v in = pin 15, 200 mv[p-p] env detection hysteresis d v enon input 15, output 13 ? 1.7 ? db v in = pin 15, 200 mv[p-p] sp env pulse front edge delay t dhsw input 16, output 13 ? 0.4 ?m s v in = rectangular wave, 0 v to 5 v 300 hz sp env pulse width t wshw input 16, output 13 ? 570 ?m s v in = rectangular wave, 0 v to 5 v 300 hz sp env pulse hysteresis d v hson input 16, output 13 ? 80 ? mv[p-p] v in = triangular wave, 2 v[p-p] 300 hz n terminal equivalent circuits 200 w hss on 2 10 k w 200 w 3 0 v 3.5 v hss sin wave
AN3275SB ics for vcr 6 pin no. equivalent circuit impedance signal waveform dc (v) 4 pa in (ma, cl) 10 k w 2.3 5 a fil 5005 w 1.5 6 maalev 21 k w dc 2.1 7 maafil current output ? n terminal equivalent circuits (continued) 10 k w 200 w 4 sin wave 6 200 w 70 k w 30 k w 7 200 w i 0 v (r gnd) 5 005 w 200 w 2k w 5
ics for vcr AN3275SB 7 pin no. equivalent circuit impedance signal waveform dc (v) 8 caafil tr-c dc ca 0 v ma open 9 caalev 19 k w dc 2.1 10 a dc 10 k w dc 2.8 11 a det tr-c ? n terminal equivalent circuits (continued) 8 80 k w 20 k w low at ca 9 200 w 75 k w 25 k w 10 k w 200 w 10 11
AN3275SB ics for vcr 8 pin no. equivalent circuit impedance signal waveform dc (v) 12 clr in tr-b 0 13 clr out tr-c ? 14 envdet 2.0 k w 1.0 15 pb fm in 20 k w 2.7 n terminal equivalent circuits (continued) 200 w 10 k w 30 k w 500 w 12 13 2 k w 200 w 14 15 20 k w 200 w
ics for vcr AN3275SB 9 pin no. equivalent circuit impedance signal waveform dc (v) 16 head amp sw 11 k w 1.3 17 env adj. 25 k w dc 2.7 18 v det out tr-b 0 19 env l det 200 w 3.3 n terminal equivalent circuits (continued) 17 45 k w 55 k w 18 10 k w 70 k w 500 w 7 pf ma on 19 200 w 200 w 16 3 600 w 200 w 8 400 w
AN3275SB ics for vcr 10 pin no. equivalent circuit impedance signal waveform dc (v) 20 env h det 200 w 1.8 21 vmd current output ? 22 vmw current output ? 23 vs out tr-c ? n terminal equivalent circuits (continued) 20 200 w 200 w 200 w 21 vss on 23 200 w 22 mmi on 0 v 3.5 v vss 0 v 3.5 v vss
ics for vcr AN3275SB 11 pin no. equivalent circuit impedance signal waveform dc (v) 24 sync fil 2 100 w 1.5 25 v det tr-c ? 26 n.c. ??? 27 ma v lev 25 k w dc 2.6 28 ma v fil 1 000 w dc pedestal 1.8 n terminal equivalent circuits (continued) 24 2 100 w 200 w 25 27 200 w 47 k w 53 k w 28 1 000 w 200 w
AN3275SB ics for vcr 12 pin no. equivalent circuit impedance signal waveform dc (v) 29 ca v lev 25 k w dc 2.9 30 ca v fil 200 w dc pedestal 1.8 31 cl cap push-pull dc 3.0 32 ctrap 2 030 w sync. 1.8 n terminal equivalent circuits (continued) 30 200 w 200 w 31 i 29 200 w 49 k w 51 k w 32 2 030 w 200 w
ics for vcr AN3275SB 13 pin no. equivalent circuit impedance signal waveform dc (v) 33 v in tr-e sync. 1.8 34 a ref (audio reference) 25 k w dc 2.9 35 ca/ma sel 25 k w dc 2.5 36 gnd ??? n terminal equivalent circuits (continued) 34 57 k w 200 w 43 k w 10 k w 50 k w 50 k w 200 w 35 200 w 200 w 33
AN3275SB ics for vcr 14 n reference description on commercial advance: the commercial advance technology is focused on detecting a black level existing between a program and a cm in the tv broadcasting in the north america and the rental video tapes so as to let a microcomputer recognize a cm part by its algorithm in order to skip the cm automatically. this ic is designed for a black level detection of a video signal and for no-sound detection. there are the following three modes in the ca technology: 1) commercial advance mode once a program is recorded in this mode, its cm part is automatically identified and is skipped from the next playback. first it identifies the cm in recording the program, then puts a mark on the cm position on the video tape so that the mark can be detected at the playback to erase the sound of the marked part and display a blue color on the tv screen. in the case that the tape not recorded in the commercial advance mode has been played back in this particular mode, the marking will be done and the commercial will be skipped from the next playback. 2) movie advance mode the mode is used to play back the recorded rental video tape. you can automatically skip the commercials or commercial promotions (preview) placed before a movie start and can move to a movie starting point. in this mode, there are two modes available: one that skips all of a preview commercial and the other that stops skipping just before a preview commercial, so that you can make a choice when you want to watch a preview commercial. 3) ca-lite mode in any programs recorded by either way, the vcr enters into a forward search mode if a user presses the skip button, and when a commercial is skipped, the skipping process stops automatically. since the end of the commercial group is detected by software just after the last cm has passed, the vcr runs a reverse search for a short time then returns to a normal play mode and starts a program again.
ics for vcr AN3275SB 15 n application circuit example system example ic application circuit example gnd 36 ca/ma sel 35 34 v in 33 c trap 32 cl cap 31 ca v fil 30 ca v lev 29 ma v fil 28 ma v lev 27 n.c. 26 v det 25 sync fil 24 vs out 23 vmw 22 vmd 21 envh det 20 envl det v cc hmw ra in pa in ma v lev ma a fil ca a fil ca a lev a det clr in clr out env det pb fm in hsw in env adj. 19 2.2 m f 1.0 m f 0.01 m f 0.01 m f 0.01 m f 0.22 m f 0.1 m f 0.1 m f 0.1 m f 0.1 m f 47 m f 39 pf 2.1 v[p-p] 47 k w 47 k w 0.01 m f 0.1 m f 2.2 m f 0.1 m f 0.01 m f 0.1 m f 0.1 v[p-p] 1.0 v[p-p] 0.1 m f 1 000 pf 39 k w ma ca 1 000 pf 47 k w 2 200pf 2 700pf 5 v typ. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 clamp clamp mm3 h-dl mm4 h-wd lpf amp. 2 sync. sepa. amp. black video detect v-sync. sepa. non-audio detect audio 1 latch 2 video 1 latch 2 counter counter env detector mix. mm1 v-d l mm2 v-w id bp h mask lpf3 v mask h mask v mask env mask ma ma ca ca e/v mask e/v mask e/v mask ma ca video sound video black detection clr pulse AN3275SB vcr microcontroller to clt head to survo/timer to front panel serial bus microcontroller ca processor rom, ram a/d low sound detection

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