NTE1428 Integrated Circuit Cylinder Servo Control Circuit for VCR Description: The NTE1428 is an integrated circuit designed for VTR’s cylinder servo control. Features: D Sample Hold System Speed Control D Incorporating Recording/Playback Switching Circuit D Supply Voltage Either 9V or 12V Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, V1−7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4V Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 880mW Operation ambient temperature, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −20 to +70°C Storage temperature, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40 to +150°C Electrical Characteristics: (TA = +25°C unless otherwise specified) Parameter Circuit Current Symbol I1 Test Conditions Min Typ Max Unit V1−7 = 12V 33 − 65 mA PG − Amp. In S(1) VCC = 12V, 30Hz duty 96% 1 − − Vo−p PG + Amp. In S(2) VCC = 12V, 30Hz duty 4% 1 − − Vo−p Cap PG Amp. In S(3) VCC = 12V 50 − − mVo−p VSS Amp. In S(4) 2 − − Vo−p REF Amp. In S(5) 3 − − Vo−p REC/P.B. Switch S(6) 5 − − V Ref. Voltage (phase trapezoidal wave) VREF(1) 2.7 − 3.7 V High−level output Voltage (Head−SW) VOH(1) 9 − − V Low−level output Voltage (Head−SW) VOL(2) VCC = 12V, VI24 = 2Vp−p, 30Hz duty 4% VI23 = 2Vp−p, 30Hz duty 96% − − 600 mV High−level output Voltage (REC CTL Amp) VOH(2) VCC = 12V 8 − − V Low−level output Voltage (REC CTL Amp) VOL(2) − − 1 V High−level output Voltage (S/H1) VOH(3) 9 − − V Low−level output Voltage (S/H1) VOL(3) − − 600 mV Voltage Gain (CTL Amp.) GV 62 − 70 dB Sensitivity (FG Amp. In) S(7) 100 − − mVp−p VREF(2) 2.7 − 3.7 V Sensitivity Ref. Voltage (speed system trapezoidal wave) Electrical Characteristics (Cont’d): (TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 10 − − V High−level output Voltage (S/H2) VOH(4) Low−level output Votlage (S/H2) VOL(4) − − 1.8 V High−level output Voltage (Cap PG) VOH(5) 4.4 − 6.6 V Low−level output Voltage (Cap PG) VOL(5) − − 600 mV VCC = 12V Pin Connection Diagram VCC From Capstan Servo Control From Capstan Pulse Generator Head Bypass Cap Control Head Signal Input Control Head Signal Return GND 1 28 Rec/PB Switch 2 27 Control Track 3 26 Subcarrier Input 4 25 5 24 PG Input Return 6 23 PG Input 7 22 PG Shifter Adjust S & H Speed Control 8 21 PG Shifter Adjust Bypass Cap 9 20 Bias Resistor 10 19 Bypass Cap 11 18 GND 12 17 Decouple VCC 13 16 Bypass Cap Drum Freq Gen 14 15 S & H Output Duty Adjust VSS Input Head Switch Pulse Output Record Shifter Adjust To Capstan Servo Control Bias Resistor (Phase Control) 14 1 15 28 .540 (13.7) 1.469 (37.32) Max .250 (6.35) .100 (2.54) 1.300 (33.02) .122 (3.1) Min .600 (15.24)