NTE1489 Integrated Circuit Stereo Demodulator Description: The NTE1489 is a silicon monolithic integrated circuit in a 16–Lead DIP type package designd for use as an FM multiplex demodulator for high class stere FM tuners. As the IC adopts a PLL (Phase Lock Loop) system, complexity of contol is usually experienced when using conventional external coil is eliminated and the demodulator can easily be constructed by simply controlling the external semi– fixed potentiometer. Internal circuits are composed of a stereo demodulator, a lamp driver, an input stage pre–amplifier that is capable of establishing variable input signal levels, a VCO (Voltage Controlled Oscillator) constituting PLL, a phase comparator, a LPF (Low Pass Filter), a frequency divider, and a DC amplifier. A stereo–monaural automatic switching circuit, a circuit for manual switching, VCO forced stop circuit, etc. are built–in. Features: D Fewer External Components. Coil is not used. D Low Monaural Total Harmonic Distortion D Low Stereo Total Harmonic Distortion D High Channel Separation D Built–In Output Stage Post Amplifier D Stereo–Monaural Switching can be made either Automatically or Manually from Outside. The Shock Noise at Switching is Reduced Considerably. D Stereo–Monaural Switching Operation is perfectly Synchronized with the Stereo Indicator Lamp D Monitoring of VCO Free Running Frequency can be Performed by Directly Connecting the Frequency Counter to Pin9. D High Signal–to–Noise Ratio D Wide Maximum Input Level Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Lamp Current, IL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA Package Dissipation (TA = +70°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Recommended Operating Conditions: (TA = +25°C unless otherwise specified) Parameter Supply Voltage Symbol VCC Test Conditions Min Typ Max Unit 9 12 15 V Electrical Characteristics: (TA = +25°C, VCC = 12V, f = 1kHz, R1 = 47kΩ, R+L = 270mV, Pilot = 30mV unless otherwise specified) Parameter Symbol Supply Current ICC Channel Separation Test Conditions Min Typ Max Unit 12 20 30 mA f = 100Hz 40 50 – dB f = 1kHz 45 55 – dB f = 10kHz 35 45 – dB 9 13 17 dB No Signal Sep. Pilot = 30mV Voltage Gain AV Monaural, Vin = 300mV, Note 1 Channel Balance CB Monaural, Vin = 300mV –1.5 0 1.5 dB Stereo, Pilot = 30mV –1.5 0 1.5 dB – 0.02 0.1 % f = 100Hz – 0.02 – % f = 1kHz – 0.02 0.1 % f = 10kHz – 0.12 – % Pilot Level, R1 = 47kΩ 6 12 20 mVrms – 6 – dB – % Monaural Total Harmonic Distortion THD Vin = 300mV Stereo Total Harmonic Distortion THD R+L = 270mV, Pilot = 30mV Pilot Level for Lamp ON L –ON Stereo Lamp Hysteresis Hy. Pilot Level Capture Range CR Pilot = 30mV Ultrasonic Frequency Rejection SCA Rejection ±1.5 ±3.0 19kHz Rej. Pilot = 30mV – 35 – dB 38kHz Rej. Pilot = 30mV – 45 – dB SCA Rej. Pilot = 30mV, SCA = 30mV – 70 – dB Maximum Input Level Vin Monaural, THD = 1% – 0.7 – Vrms Signal–to–Noise Ratio S/N Vin = 300mV, After LPF – 82 – dB Stereo–Monaural Switching SW–ON Voltage Vs Pin16 Voltage where Stereo Lamp – OFF – 1.4 1.6 V VCO Stop Voltage Vo Pin16 Voltage where VCO Stops 7 – VCC V Note 1. AV is from the output level measured at the IC output terminal. AV can be set by the input impedance R1. Pin Connection Diagram VCC 1 Preamp Input 2 Preamp Output 3 16 Stereo/Mono Switch & VCO Stop 15 OSC RC Network 14 Loop Filter Postamp Bias 4 13 Loop Filter Postamp Bias 5 12 Detector Input Rt Ch Output 6 11 Switch Filter Lt Ch Output 7 10 Switch Filter GND 8 9 Stereo Lamp & 19kHz Monitor 16 9 .260 (6.6) Max 1 8 .785 (19.9) Max .300 (7.62) .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)