NTE1728 Integrated Circuit VIF & SIF Circuit for VCR Description: The NTE1728 is an integrated circuit in a 30–Lead DIP type package containing the VIF section and SIF on a single chip. Since this device is capable of performing video detection and sound detection independently or simultaneously, it can be applied to various sets from popular type to high–grade type according to the designer’s policy. Features: D High–Gain VIF Amp Requiring No Preamp D High AGC Speed D Provides Wide–Band Detection Characteristics and Meets Sound MPX Demodulation Requirements because of FM Detection being Quadrature Detection. D Possible to use Sound REC Pin (Pin2), AUX Pin (Pin3) D Possible to Mute Video, Sound for VCR D Pin7 GND: Muting of both Video and Sound D Pin29 GND: Muting of Sound Only Functions: D VIF Section: VIF Amp Video Det, Peak IF AGC, B/W Noise–Canceller, RF AGC, AFT, SIF DET D SIF Section: SIF Limiter Amp, FM Det, DC ATT, AF Driver Operating Characteristics: (TA = +25°C, VCC = 12V, fp = 58.75MHz, fs = 54.25MHz (VIF), fo = 4.5MHz (SIF) unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 59 74 98 mA VIH Section Total Circuit Current I23 + I24 DC Maximum RF AGC Voltage VH13H DC 8.5 8.9 9.2 V Minimum RF AGC Voltage V13L DC – 0 0.5 V Quiescent Video Output Voltage V22 DC 5.6 6.1 6.6 V Quiescent AFT Output V17 DC 4.5 6.5 7.5 V fm = 400Hz 40% AM, VO = 0.8Vpp 30 36 42 dBµ fm = 15kHz 78% AM, VO = ±1dB 60 74 – dB Input Sensitivity AGC Range Vi GR Operating Characteristics (Cont’d): (TA = +25°C, VCC = 12V, fp = 58.75MHz, fs = 54.25MHz (VIF), fo = 4.5MHz (SIF) unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit VIH Section (Cont’d) Maximum Allowable Input Vimax fm = 15kHz 78% AM, VO = ± 1dB Video Output Amplitude VO(22) Vi = 10mVrms, fm = 15kHz 78% AM 1.9 2.2 2.5 Vpp Output S/N S/N Vi = 10mVrms, CW 48 54 – dB Carrier Leakage CL Vi = 100mVrms, fm = 15kHz 78% AM 50 57 – dB Maximum AFT Voltage V17H Vi = 10mVrms, SWEEP 11.0 11.5 12.0 V Minimum AFT Voltage V17L Vi = 10mVrms, SWEEP 0 0.4 1.0 V Sf Vi = 10mVrms, SWEEP 70 100 140 mV/kHz White Noise Threshold Level VWTH Vi = 10mVrms, SWEEP 6.4 6.8 7.2 V Black Noise Threshold Level VBTH Vi = 10mVrms, SWEEP 1.9 2.2 2.5 V Black Noise Clamp Level VBCL Vi = 10mVrms, SWEEP 3.8 4.2 4.6 V SIF Output Signal Voltage VO(25) P/S = 20dB 40 60 100 mVrms Frequency Characteristic fo –3dB 6 8 – MHz AFT Detection Sensitivity Differential Gain DG Vi = 10mVrms 87.5, VIDEOMOD – 4 10 % Differential Phase DP Vi + 10mVrms 87.5%, VIDEOMOD – 3 6 deg Input Resistance Ri Vi = 10mVrms 87.5,%, VIDEOMOD 1.0 1.5 2.0 kΩ Input Capacitance Ci – 3.5 7.0 pF – 200 400 µVrms SIF Section SIF Limiting Voltage Vilim –3dB Detection Output Voltage VO(2) Vi = 100mVrms, fm = 400Hz, f = ±25kHz 450 680 850 mVrms THD(2) Vi = 100mVrms, fm = 400Hz, f = ±25kHz – 0.5 1.0 % AM Rejection AMR Vi = 100mVrms, fm = 400Hz, f = ±25kHz 30% 50 60 – dB DCVR Maximum Attenuation ATT Vi = 200mVrms, f = 400Hz 70 80 – dB AF Amp Gain GAF Vi = 100mVrms, f = 400Hz 18 20 22 dB AF Amp Output Voltage VO(5) VO(5) THD = 10%, f = 400Hz 3 4 – Vrms Distortion Pin Connection Diagram Ceramic Discriminator De–Emphasis AF Input N.F. AF Output GND IF AGC Filter Mute VIF Input VIF Input Mute RF AGC VR RF AGC Filter IF AGC Filter Sound Trap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 30 16 1 15 Ceramic Discriminator Mute Attenuator Mute Switch Ceramic Filter SIF Input SIF Output SIF VCC VIF VCC Video Output AFT Coil LLD Coil LLD Coil AFT Coil AFT Coil Sound Trap 1.066 (27.0) .388 (8.6) .200 (5.08) Max .070 (1.78) .125 (3.17) .400 (10.16)