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