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| Video ICs Digital servo controller for VCRs BU2890 series The BU2890 series are LSI linear digital-servo controllers that allows construction of a VCR servo system using one IC. The package is a SDIP 42 pin. The circuit provides linear input signal wave-shaping, and has a servo function for output of the speed and phase control for the drum and capstan. In addition, it generates a quasi-V pulse for special playback, and has a recording mode auto-discrimination function, an FM audio head switch signal generator for Hi-Fi systems, and is compatible with VISS / VASS operation. It can also steplessly vary capstan speed during FF / REW. It also has a mixing amplifier and CTL amplifier for linear signal wave-shaping, so external linear circuits are not required. *Applications VCRs *Features servo functions on a single chip. 1) All VCR 2) Built-in CTL and mixing amplifiers with AGC. 3) Built-in wave-shaping circuit for the DFG, DPG and CFG signals. 4) Mode setting via two-line serial data transfer with parity checking. 5) Built-in digital gain-compensation circuit for the capstan system. 6) VISS / VASS compatible with CTL overwrite for playback and VISS code discrimination. 7) Microprocessor control for stepless capstan speed control during FF and REW. 8) Special constant-voltage diode for playback head switching logic. *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Symbol VDD Limits 4.5 ~ 5.5 Unit V *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Pin applied voltage Symbol VDD Pd Topr Tstg VIN Limits 7 500 - 15 ~ + 70 - 55 ~ + 125 VSS - 0.3 ~ VDD + 0.3 Unit V mW C C V Reduced by 5mW for each increase in Ta of 1C over 25C. 1 Video ICs BU2890 series *Block diagram H. A. SW DPV OUT DFV OUT VDD CPV OUT CFV OUT VSS FSCIN PORT1OUT ROTARY SDATA SCLOCK SWMM RFSW AHSW CSYNCIN VPOUT 1 ROM REF GENER DRUM PHASE HEADSW LOGIC DIGITAL TRACKING 42 ENV SLOW + STILL DRUM MIX + DRUM MIX - DRUM MIXOUT CAPMIX + CAPMIX - CAP MIXOUT DPGIN DFGIN CFGIN CFGAMPOUT CTLAMPOUT CTLAMP - VSSA VDDA RECCTL + RECCTL - AMP BIAS EP / LP / SP CTLDUTYOUT 2 ROM DRUM F-V 41 3 REC 40 4 ROM CAP REF CAP PHASE 39 DRUMMIX 38 REC 37 5 ROM CAP F-V 6 7 CAPMIX 8 CLK GENER DFG COUNT 1/N 10 REC 11 MODE CTL 36 35 9 34 33 1/M 32 CLAMP 12 1/N 13 MM CTLF RF-SW AF-SW GENER 31 30 AGC 29 CTLR F 28 14 15 V-SYNC SEP H SEP 17 VD GENER REC REC CTL FF REC DA REC 16 27 26 18 25 REC CFGOUT CTLOUT 19 1/2 1/2 TAPE SPEED DET. 24 20 23 21 REC SLOW DUTY VISS DET 22 2 Video ICs BU2890 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 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 Pin name H. A. SW DPVOUT DFVOUT VDD CPVOUT CFVOUT VSS FSCIN PORT1OUT ROTARY SDATA SCLOCK SWMM RFSW AHSW CSYNCIN VPOUT CFGOUT CTLOUT CTLDUTYOUT EP / LP / SP AMPBIAS RECCTL - RECCTL + VDDA VSSA CTLAMP - CTLAMPOUT CFGAMPOUT CFGIN DFGIN DPGIN CAPMIXOUT CAPMIX - CAPMIX + DRUMMIXOUT DRUMMIX - DRUMMIX + SLOW + STILL ENV Function Head amplifier switch output Drum phase error PWM output Drum speed error PWM output Logic power supply Capstan phase error PWM output Capstan speed error PWM output Logic ground fsc input Serial port 1 output Chroma rotary output Serial data input Serial clock input SW monostable multivibrator Video head switch output Audio head switch output Composite synchronization input Quasi-Vpulse output Optional pin CFG wave shaping output CTL wave shaping output Optional pin CTL duty discriminant output / VISS discriminant output Tape speed discriminator output Amplifier bias voltage output CTL coil ( - ) CTL coil ( + ) Analog power supply Analog ground CTL amplifier ( - ) input CTL amplifier output CFG amplifier output CFG amplifier input DFG amplifier input DPG amplifier input Capstan MIX amplifier output Capstan MIX amplifier ( - ) input Capstan MIX amplifier ( + ) input Drum MIX amplifier output Drum MIX amplifier ( - ) input Drum MIX amplifier ( + ) input Slow / still input Envelope detector input 3 Video ICs BU2890 series *Electrical characteristics (unless otherwise noted, Ta = 25C and VDD = 5V) Parameter Supply current Logic output high level voltage Logic output low level voltage Logic input threshold Three-value input H / M threshold Three-value input M / L threshold fsc input level Monostable multivibrator comparator level RECCTL output high level voltage RECCTL output low level voltage DFG input sensitivity DPG input sensitivity CFG amplifier openloop gain CFG input threshold MIX amplifier openloop gain MIX amplifier output high level voltage MIX amplifier output low level voltage MIX amplifier bias voltage Symbol IDD VH VL VTH VTH1 VTH2 Vfsc VTHM VCTH VCTL VDFG VDPG GCFG VTCF GMIX VOH VOL VBMI Min. 17 4.0 -- 1.5 2.85 0.80 0.2 2.15 2.9 -- 0.1 30 70 120 60 4.2 -- 2.4 Typ. 33 4.7 0.2 -- 3.30 1.25 -- 2.40 3.2 0.3 0.2 50 -- 150 -- 4.7 0.4 2.5 Max. 60 -- 0.5 3.5 4.00 1.75 3.0 2.65 -- 0.5 0.4 70 -- 180 -- -- 0.6 2.6 Unit mA V V V V V VP-P V V V mVP-P mVO-P dB mVP-P dB V V V ILOAD = - 5.0mA ILOAD = 5.0mA IL = - 3.0mA IL = 3.0mA AC coupling ILOAD = -1.0mA ILOAD = 1.0mA Conditions 4 Video ICs BU2890 series *External dimensions (Units: mm) 37.1 0.3 42 22 13.7 0.3 3.2 0.3 4.5 0.3 0.51Min. 1 21 15.2 0.3 0.1 0 ~ 15 1.778 0.5 0.1 SDIP42 5 |
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