NTE789 Stereo Multiplex Decoder PDIP-16

Info as pdf-file

Description:
The NTE789, a monolithic silicon integrated circuit, is a stereo multiplex decoder intended for FM multiplex systems.
This stereo multiplex decoder requires only one low-inductance tuning coil (requires only one adjustment for complete alignment), provides automatic stereo switching, energizes a stereo indicator lamp, and operates from a wide range of voltage supplies.
Figure 1 shows the block diagram for the NTE789. The input signal form the detector is amplified by a low-distortion preamplifier and simultaneously applied to both signal, generated by a local voltage-controlled oscillator (VCO), is counted down by two frequency dividers to a 38kHz signal and to two 19-kHz pilot-tone supplied by the FM detector is compared to the locally generated 19-kHz signal in a synchronous detector. The resultant signal controls the voltage controlled oscillator (VC)) so that it produces an output signal to phase-lock the stereo decoder with the pilot tone. A second sychronous detector compares the locally generated 19-kHz signal with the 19-kHz pilot tone. If the pilot tone exceeds and externally adjustable threshold voltage, a Schmitt trigger circuit is energized. The signal from the Schmitt trigger lights the stereo indicator, enables the 38-kHz synchronous detector, and automatically switches the NTE789 form monaural to stereo operation. The output signal from the 38-kHz detector and the composite signal from the preamplifier are applied to a matrixing circuit from which emerge the resultant left and right channel audio signals. These signals are applied to their respective left and right post amplifiers for amplification to a level sufficient to drive most audio amplifiers. The NTE789 utilizes the 16-lead quad-in-line plastic package and operates over the ambient temperature range of -40°C to +85°C.

Features:
- Requires the use of only one low-inductance tuning coil
- Automatic stereo switching
- Directly drives a stereo indicator lamp up to 100mA
- Includes driver for stereo-lamp indicator
- Operates from a wide range of power supplies: 10 to 16 volts
- Requires only one adjustment for alignment
- Switching from monaural to stereo and stereo to monaural produces no audible thumps
- Low distortion: under 0.5%
- Separate dc input permits stereo defeat or enable
- High signal output: directly drives audio amplifiers
- Excellent SCA (storecast) rejection: 55dB typ.
- High audio channel separation: 40dB typ.

Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
DC Supply Voltage.........................................................................16V
Current at Pin12........................................................................ 100mA
Input Signal Voltage (Composite)(Note 1).................................................. 400mV
Operating Ambient Temperature Range...............................................-40 to +85°C
Storage Ambient Temperature Range................................................ -65 to +150°C
Lead Temperature (During Soldering, 1/32” (0.79mm) from case,10s max.).....................+265°C

Note 1. For stereo operation, a minimum input signal voltage (composite) of 40mV is required.

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