1 video ics digital servo controller for vcrs BU2880 series the BU2880 series are linear digital-servo controllers that allow construction of a vcr servo system using one ic. the drum and capstan systems have digital filters, and the ic is compatible with viss / vass overwriting and wide-aspect operation. applications video cassette recorders absolute maximum ratings (ta = 25?) parameter symbol limits unit 7.0 v pd mw topr c tstg c v dd 500 * ?15 ~ + 70 ?55 ~ + 125 power supply voltage power dissipation operating temperature storage temperature * reduced by 5mw for each increase in ta of 1 c over 25 c. features 1) all vcr servo functions on a single chip. 2) digital filters in the drum and capstan speed and phase systems. 3) built-in ctl amplifier with serial gain setting. 4) viss / vass overwriting and index detection func- tions for wide-aspect operation. 5) drum f h compensation calculation function from speed detect function. 6) 6.5h discrimination. 7) compatible with 19 m m heads. recommended operating conditions (ta = 25?) parameter symbol min. typ. max. unit v v dd 4.5 5.0 5.5 power supply voltage
2 video ics BU2880 series block diagram 1 2 3 4 5 6 7 8 9 10 11 12 19 20 21 22 23 24 18 17 16 15 14 13 ctl count search det drum rom cal cap ref cap trape rom capfv ff digital filter digital filter + mix + mix recctl 1 / m r2r + f f romdata r r rec rec ctlout1 * 1fwd sample sample ctlout2 trig high trig cfgout cfg count vp delay vp width vff h vpon ahswon pgmm fg counter (servoff) ck r dpg romdata romdata vd p.set sample sample drumfv tra mm + ctl delay ref counter drum trape fsc bit pat. pwmgen vd sync sep sidata det mode dfg duty det viss det 6.5h det 6.5h sdata vsyncin fscin cfgout ctlout1 ctlout2 drumpfv cappfv v dd ctlampout ctlamp ctlamp + vhsw ctlduty dfgin dpgin ahsw vhpulse vpdly cfgin vss ctlcompin recctl + recctl + rec
3 video ics BU2880 series pin descriptions pin no. 1 sdata 2 vsyncin 3 fscin 4 cfgout 5 ctlout1 6 ctlout2 7 drumpfv 8 cappfv 9 10 ctlampout 11 ctlamp 12 ctlamp + 13 recctl 14 recctl + 15 ctlcompin 16 vss 17 cfgin 18 vpdly 19 vhpulse 20 ahsw 21 dpgin 22 dfgin 23 ctlduty 24 vhsw v dd pin name function serial data input (tri-state) composite sync input system clock input cfg divider output ctl comparator output ctl divider output d rum control output (digital filter output) capstan control output (digital filter output) power supply ctlamp output ctlamp ?input ctlamp + input recording ctl ?output recording ctl + output ctl comparator input gnd cfg input quasi-vh pulse delay amount control input quasi-vh pulse output head switch audio output d rum pg input d rum fg input duty discrimination, viss discrimination, 6.5h discrimination output / vass duty control input head sw video output input / output circuits out 4: cfgout 5: ctlout1 6: ctlout2 7: drumpfv 8: cappfv 20: ahsw 24: vhsw logic output + + 60k 60k 2k 500 1.5 / 5v dd 1 / 5v dd 45 iniop inion in 23: ctlduty shared input / output terminal duty i / o: off 6.5h discrimination: on 420 fscin 52k 3: fscin fsc input
4 video ics BU2880 series vpout 60k 60k 19: vhpulse tri-state output + + 2k 3 / 5v dd 2 / 5v dd 500 in 2: vsyncin 18: vpdly two-value input + + + + 2k 3 / 5v dd 3.5 / 5v dd 1.5 / 5v dd 1 / 5v dd 500 in 60k 60k 1: sdata three-value input 2k 2.75 / 5v dd 2.25 / 5v dd 2.5 / 5v dd 500 + + + cfgin 36k 36k 17: cfgin cfg input (zero cross comparator) + + + + 22.5 2. 35 / 5v dd 2. 65 / 5v dd 2.75 / 5v dd 2.25 / 5v dd ctlcohpin 15: ctlcomp in ctl comparator input 23k 23k + ctlampout 42k ctlamp + ctlamp _ recctl recctl + 10: ctlampout 11: ctlamp 12: ctlamp + 13: recctl 14: recctl + ctlamp 2k 2.7 / 5v dd 2.3 / 5v dd 500 + + dfgin 21k 21k 22: dfgin dfg input 2k 2.2 / 5v dd 2.5 / 5v dd 500 + + dpgin 27k 18k 21: dpgin dpg input
5 video ics BU2880 series electrical characteristics (unless otherwise noted, ta = 25? and v dd = 5v) parameter symbol min. typ. max. unit i dd ?738ma v pon 1.0 1.5 2.0 v v h 4.0 4.5 v v l 0.4 1.0 v v th 2.5 3.0 3.5 v i lin ? 1 m a i pu 59 83 116 m a i cfg 100 140 196 m a v h3 4.0 4.5 v v l3 0.4 1.0 v v m3 2.0 2.5 3.0 v v tinh 3.10 3.50 4.00 v v tinl 1.00 1.50 1.90 v i tin 59 83 116 m a v rck 0.2 4.0 i fscin 61 85 119 m a v rcth 4.00 4.56 v v rctl 0.16 0.60 v v oh 3.8 4.3 v v ol 0.2 0.5 v v ctli 200 250 300 mv v co 75 100 125 mv v bi 2.4 2.5 2.6 v v p-p supply current power on reset threshold two-value output high level voltage two-value output low level voltage two-value input threshold two-value input current pullup input current cfg input current three-value output high voltage three-value output low voltage three-value output mid voltage three-value input "h" threshold three-value input "l" threshold three-value input current ( ) fsc operating input level fsc input current ( ) recctl output high level voltage recctl output low level voltage ctlamp ? output high level voltage output low level voltage ctlamp comparator level ctlamp comparator width ctlamp bias level s not designed for radiation resistance. conditions i load = 1.5ma i load = 1.5ma v n = gnd i load = 1.5ma i load = 1.5ma v in = v dd , gnd i load = 2.0ma i load = 2.0ma i load = 1.0ma i load = 1.0ma v in = v dd , gnd v n = v dd , gnd v in = v dd , gnd schmitt level + 0v, ?1.0v schmitt level + 0v, ?0.5v schmitt level + 0v, ?0.5v ac coupled, duty: 40 to 60%, c = 1000pf with respect to bias
6 video ics BU2880 series measurement circuit 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 12 a + + + + a + + a + a + a + a a + vhsw ctlduty dfgin dpgin ahsw vhpulse vpdly cfgin vss ctlcompin recctl + recctl sdata vsyncin fscin cfgout ctlout1 ctlout2 drumpfv cappfv v dd ctlampout ctlamp ctlamp + v dd a a 11 a a fig.1 electrical characteristic curves 0 0.2 0.4 0.6 0.8 1.0 1.0 2.0 3.0 4.0 v dd ???voltage: v dd ?v h (v) drive current: i h (ma) fig. 2 two-value output high level voltage vs. drive current characteristics 0 0.2 0.4 0.6 0.8 1.0 1.0 2.0 3.0 4.0 ??voltage: v l (v) drive current: i l (ma) fig. 3 two-value output low level voltage vs. drive current characteristics 0 0.2 0.4 0.6 0.8 1.0 1.0 2.0 3.0 4.0 v dd ???voltage: v dd ?v h3 (v) drive current: i h3 (ma) fig. 4 three-value output high level voltage vs. drive current characteristics
7 video ics BU2880 series 0 0.2 0.4 0.6 0.8 1.0 1.0 2.0 3.0 4.0 ??voltage: v l3 (v) drive current: i l3 (ma) fig. 5 three- value output low level voltage vs. drive current characteristics 0 0.2 0.4 0.6 0.8 1.0 1 2 3 4 5 v dd ???voltage: v dd ?v rcth (v) drive current: i rcth (ma) fig. 6 recctl output high level voltage vs. drive current characteristics 0 0 0.2 0.4 0.6 0.8 1.0 2 4 6 8 10 ??voltage: v rctl (v) drive current: i rctl (ma) fig. 7 recctl output low level voltage vs. drive current characteristics 0 0.2 0.4 0.6 0.8 1.0 1.0 2.0 3.0 4.0 v dd ???voltage: v dd ?v oh (v) drive current: i oh (ma) fig. 8 ctlamp output high level voltage vs. drive characteristics 0 0.2 0.4 0.6 0.8 1.0 1.0 2.0 3.0 4.0 ??voltage: v ol (v) drive current: i ol (ma) fig. 9 ctlamp output low level voltage vs. drive current characteristics external dimensions (units: mm) sdip24 0.51min. 6.5 0.3 0.3 0.1 7.62 3.4 0.2 22.9 0.3 0.5 0.1 1.778 13 12 24 1 3.95 0.3 0 ~ 15
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