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:
• Fewer External Components. Coil is not used.
• Low Monaural Total Harmonic Distortion
• Low Stereo Total Harmonic Distortion
• High Channel Separation
• Built–In Output Stage Post Amplifier
• Stereo–Monaural Switching can be made either Automatically or Manually from Outside. The Shock Noise at Switching is Reduced Considerably.
• Stereo–Monaural Switching Operation is perfectly Synchronized with the Stereo Indicator Lamp
• Monitoring of VCO Free Running Frequency can be Performed by Directly Connecting the Frequency Counter to Pin9.
• High Signal–to–Noise Ratio
• Wide Maximum Input Level