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| 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 = +25C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Lamp Current, IL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA Package Dissipation (TA = +70C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +125C Recommended Operating Conditions: (TA = +25C unless otherwise specified) Parameter Supply Voltage Symbol VCC Test Conditions Min 9 Typ 12 Max 15 Unit V Electrical Characteristics: (TA = +25C, VCC = 12V, f = 1kHz, R1 = 47k, R+L = 270mV, Pilot = 30mV unless otherwise specified) Parameter Supply Current Channel Separation Symbol ICC Sep. No Signal Pilot = 30mV f = 100Hz f = 1kHz f = 10kHz Voltage Gain Channel Balance AV CB Monaural, Vin = 300mV, Note 1 Monaural, Vin = 300mV Stereo, Pilot = 30mV Monaural Total Harmonic Distortion Stereo Total Harmonic Distortion THD THD Vin = 300mV R+L = 270mV, Pilot = 30mV f = 100Hz f = 1kHz f = 10kHz Pilot Level for Lamp ON Stereo Lamp Hysteresis Capture Range Ultrasonic Frequency Rejection L -ON Hy. CR Pilot Level, R1 = 47k Pilot Level Pilot = 30mV Test Conditions Min 12 40 45 35 9 -1.5 -1.5 - - - - 6 - Typ 20 50 55 45 13 0 0 0.02 0.02 0.02 0.12 12 6 Max 30 - - - 17 1.5 1.5 0.1 - 0.1 - 20 - - - - - - - 1.6 VCC Unit mA dB dB dB dB dB dB % % % % mVrms dB % dB dB dB Vrms dB V V 1.5 3.0 - - - - - - 7 35 45 70 0.7 82 1.4 - 19kHz Rej. Pilot = 30mV 38kHz Rej. Pilot = 30mV SCA Rejection Maximum Input Level Signal-to-Noise Ratio Stereo-Monaural Switching SW-ON Voltage VCO Stop Voltage SCA Rej. Vin S/N Vs Vo Pilot = 30mV, SCA = 30mV Monaural, THD = 1% Vin = 300mV, After LPF Pin16 Voltage where Stereo Lamp - OFF Pin16 Voltage where VCO Stops 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 Postamp Bias 4 Postamp Bias 5 Rt Ch Output 6 Lt Ch Output 7 GND 8 16 Stereo/Mono Switch & VCO Stop 15 OSC RC Network 14 Loop Filter 13 Loop Filter 12 Detector Input 11 Switch Filter 10 Switch Filter 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) |
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