NTE1268 Integrated Circuit DC Servo Circuit for VCR Description: The NTE1268 is an integrated circuit in a 28–Lead DIP type package designed for DC Servo Control Circuits in VCR’s. Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage (V5–24), VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4V Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 640mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C Electrical Characteristics: (TA = +25°C, VCC = 12V unless otherwise specified) Parameter Min Typ Max Unit I5–2 23 31 41 mA Trapezoidal Reference Voltage V16–24 0.77 1.0 1.2 V Output Voltage FF–II V23–24 10.0 10.9 – V Trapezoidal I V17–24 2.4 3.0 3.6 V Trapezoidal II V17–24 11.0 11.9 – V S & H–I V12–24 – 240 500 mV S & H–II V12–24 8.0 8.8 – V Gate–II V10–24 9.0 10.0 – V Input Sensitivity MM V22–24 3.5 – – VO–P Trapeziodal V15–24 4 – – VO–P Gate V7–24 3.5 – – VO–P S&H Vis(14) f = 30Hz, PW = 100µs 1.5 – – VO–P DET–I Vis(28) 400Hz, 1/2 Sampling Sine Wave, td = 1ms 50 – – mVO–P DET–II Vis(2) 50 – – mVO–P FG Vis(4) f = 400Hz 100 – – mVP–P FF Vis(25) f = 30Hz, Rectangular Wave 3 – – VO–P Total Circuit Current Symbol Test Conditions Pin Connection Diagram Ripple Filter 1 28 Detector 1 Input Detector 2 Input 2 Detector Time Constant 3 27 Detector Time Constant 26 Jumper to Pin22 & Pin25 FG Amp Input 4 VCC 5 25 Jumper to Pin22 & Pin26 24 GND Return Flip–Flop Output 6 Gate Input 7 23 To Head Switch 22 Jumper to Pin25 & Pin26 Gate Time Constant 8 Gate Time Constant 9 Motor Speed Signal Output 10 21 Multi Time Constant 20 Multi Time Constant 19 GND Ripple Filter 11 Motor Phase Signal Output 12 18 S & H Signal Source 17 Bypass Bypass 13 Timing Signal Input 14 16 Resistive Constant 15 Timing Reference Signal 14 1 15 28 1.469 (37.32) Max .540 (13.7) .250 (6.35) .100 (2.54) 1.300 (33.02) .122 (3.1) Min .600 (15.24)