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| 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 recorders Video cassette *Features servo functions on a single chip. 1) All VCR 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 functions for wide-aspect operation. 5) DRUM fH compensation calculation function from speed detect function. 6) 6.5H discrimination. 7) Compatible with 19m heads. *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VDD Pd Topr Tstg Limits 7.0 500 - 15 ~ + 70 - 55 ~ + 125 Unit V mW C C Reduced by 5mW for each increase in Ta of 1C over 25C. *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Symbol VDD Min. 4.5 Typ. 5.0 Max. 5.5 Unit V 1 Video ICs BU2880 series *Block diagram MODE SDATA 1 SIDATA DET DUTY DET VISS DET VSYNCIN 2 SYNC SEP FSC FSCIN 3 BIT PAT. DPG VD 6.5H DET DFG 22 DFGIN 23 CTLDUTY 24 6.5H VHSW PWMGEN CFGOUT 4 ROMDATA SAMPLE DRUMFV TRA MM + CTL DELAY ROMDATA VD REF COUNTER DRUM TRAPE SAMPLE CK R (SERVOFF) 21 DPGIN FG COUNTER PGMM VFF CTLOUT1 5 20 AHSWON VP WIDTH VPON H VP DELAY 18 19 AHSW CTLOUT2 6 P.SET VHPULSE DRUMPFV 7 DIGITAL FILTER + MIX DIGITAL FILTER + MIX CFG COUNT REC 1/M SAMPLE SAMPLE F CTLOUT2 VPDLY CAPPFV 8 17 CFGIN REC TRIG CAP REF CAP TRAPE CFGOUT - VDD 9 ROM CAPFV + RECCTL R2R 16 VSS CTLAMPOUT 10 R 1FWD FF 15 HIGH TRIG CTLCOMPIN CTLAMP- 11 -+ F R CTL COUNT SEARCH DET REC CTLOUT1 14 RECCTL+ CTLAMP+ 12 DRUM ROM CAL ROMDATA 13 RECCTL- 2 Video ICs BU2880 series *Pin descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Pin name SDATA VSYNCIN FSCIN CFGOUT CTLOUT1 CTLOUT2 DRUMPFV CAPPFV VDD CTLAMPOUT CTLAMP- CTLAMP+ RECCTL- RECCTL+ CTLCOMPIN VSS CFGIN VPDLY VHPULSE AHSW DPGIN DFGIN CTLDUTY VHSW Serial data input (tri-state) Composite sync input System clock input CFG divider output CTL comparator output CTL divider output DRUM 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 DRUM PG input DRUM FG input Duty discrimination, VISS discrimination, 6.5H discrimination output / VASS duty control input HEAD SW video output Function *Input / output circuits 4: CFGOUT 5: CTLOUT1 6: CTLOUT2 7: DRUMPFV 8: CAPPFV 20: AHSW 24: VHSW OUT 23: CTLDUTY 60k DUTY I / O: OFF 6.5H discrimination: ON IN 60k 1 / 5VDD INIOP 45 INION 500 1.5 / 5VDD - 2k - 420 FSCIN 3: FSCIN 52k + + Logic output Shared input / output terminal FSC input 3 Video ICs 19: VHPULSE 2: VSYNCIN 18: VPDLY 1: SDATA BU2880 series 3.5 / 5VDD + - 60k VPOUT 60k 2 / 5VDD 500 IN - 3 / 5VDD + 2k - 60k 500 IN 2k 3 / 5VDD + - - + 60k 1.5 / 5VDD + - + 1 / 5VDD Tri-state output Two-value input Three-value input 17: CFGIN 2.5 / 5VDD 15: CTLCOMP IN 2.75 / 5VDD + + - 2. 65 / 5VDD - 500 CFGIN 36k 2k 36k 2.25 / 5VDD + + - CTLCOHPIN - 22.5 - + - 2.75 / 5VDD 2.25 / 5VDD 2. 35 / 5VDD + - + CFG input (zero cross comparator) 10: CTLAMPOUT 11: CTLAMP- 12: CTLAMP+ 13: RECCTL- 14: RECCTL+ CTL comparator input RECCTL+ RECCTL- 42k 23k CTLAMP+ 23k + CTLAMP _ - CTLAMPOUT CTLAMP 22: DFGIN 2.7 / 5VDD 21: DPGIN 2.5 / 5VDD + 500 DFGIN 21k 21k 2k - 500 DPGIN 27k 2k 18k + - + - 2.3 / 5VDD 2.2 / 5VDD + - DFG input DPG input 4 Video ICs BU2880 series *Electrical characteristics (unless otherwise noted, Ta = 25C and VDD = 5V) Parameter 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 Not designed for radiation resistance. Symbol IDD VPON VH VL VTH ILIN IPU ICFG VH3 VL3 VM3 VTINH VTINL ITIN VRCK IFSCIN VRCTH VRCTL Min. -- 1.0 4.0 -- 2.5 -- 59 100 4.0 -- 2.0 3.10 1.00 59 0.2 61 4.00 -- Typ. 27 1.5 4.5 0.4 3.0 0 83 140 4.5 0.4 2.5 3.50 1.50 83 -- 85 4.56 0.16 Max. 38 2.0 -- 1.0 3.5 1 116 196 -- 1.0 3.0 4.00 1.90 116 4.0 119 -- 0.60 Unit mA V V V V A A A V V V V V A VP-P A V V ILOAD = 1.5mA ILOAD = 1.5mA Conditions Schmitt level + 0V, - 1.0V VIN = VDD, GND VN = GND VN = VDD, GND ILOAD = 1.5mA ILOAD = 1.5mA Schmitt level + 0V, - 0.5V Schmitt level + 0V, - 0.5V VIN = VDD, GND AC coupled, duty: 40 to 60%, C = 1000pF VIN = VDD, GND ILOAD = 2.0mA ILOAD = 2.0mA VOH VOL VCTLI VCO VBI 3.8 -- 200 75 2.4 4.3 0.2 250 100 2.5 -- 0.5 300 125 2.6 V V mV mV V ILOAD = 1.0mA ILOAD = 1.0mA With respect to bias -- -- 5 Video ICs BU2880 series *Measurement circuit A 1 SDATA VHSW 24 A 2 VSYNCIN CTLDUTY 23 + A A 3 FSCIN DFGIN 22 + A A 4 CFGOUT DPGIN 21 + 5 CTLOUT1 AHSW 20 6 CTLOUT2 VHPULSE 19 A 7 DRUMPFV VPDLY 18 + 8 CAPPFV CFGIN 17 + A VDD 9 VDD VSS 16 10 CTLAMPOUT CTLCOMPIN A 15 + A 11 + CTLAMP- RECCTL+ 14 + A 12 + CTLAMP+ RECCTL- 13 + Fig.1 *Electrical characteristic curves DRIVE CURRENT: IH (mA) 3.0 DRIVE CURRENT: IL (mA) 4.0 DRIVE CURRENT: IH3 (mA) 0.2 0.4 0.6 0.8 1.0 4.0 4.0 3.0 3.0 2.0 2.0 2.0 1.0 1.0 1.0 0 0.2 0.4 0.6 0.8 1.0 0 0 0.2 0.4 0.6 0.8 1.0 VDD - "H" VOLTAGE: VDD - VH (V) "L" VOLTAGE: VL (V) VDD - "H" VOLTAGE: VDD - VH3 (V) Fig. 2 Two-value output high level voltage Fig. 3 Two-value output low level voltage vs. drive current characteristics vs. drive current characteristics Fig. 4 Three-value output high level voltage vs. drive current characteristics 6 Video ICs 5 DRIVE CURRENT: IRCTH (mA) 10 BU2880 series DRIVE CURRENT: IL3 (mA) 4.0 4 DRIVE CURRENT: IRCTL (mA) 0.2 0.4 0.6 0.8 1.0 8 3.0 3 6 2.0 2 4 1.0 1 2 0 0.2 0.4 0.6 0.8 1.0 0 0 0 0.2 0.4 0.6 0.8 1.0 "L" VOLTAGE: VL3 (V) VDD - "H" VOLTAGE: VDD - VRCTH (V) "L" VOLTAGE: VRCTL (V) Fig. 5 Three-value output low level voltage vs. drive current characteristics Fig. 6 RECCTL output high level voltage vs. drive current characteristics Fig. 7 RECCTL output low level voltage vs. drive current characteristics DRIVE CURRENT: IOH (mA) 4.0 DRIVE CURRENT: IOL (mA) 0.2 0.4 0.6 0.8 1.0 4.0 3.0 3.0 2.0 2.0 1.0 1.0 0 0 0.2 0.4 0.6 0.8 1.0 VDD - "H" VOLTAGE: VDD - VOH (V) "L" VOLTAGE: VOL (V) Fig. 8 CTLAMP output high level voltage vs. drive characteristics Fig. 9 CTLAMP output low level voltage vs. drive current characteristics *External dimensions (Units: mm) 22.9 0.3 24 13 6.5 0.3 1 12 0.51Min. 3.4 0.2 3.95 0.3 7.62 0.3 0.1 1.778 0.5 0.1 0 ~ 15 SDIP24 7 |
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