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参数资料
| 型号： | NTE789 |
| 厂商： | NTE Electronics, Inc. |
| 英文描述： | Integrated Circuit Stereo Multiplex Decoder |
| 中文描述： | 集成电路多路立体声解码器 |
| 文件页数： | 1/3页 |
| 文件大小： | 32K |
| 代理商： | NTE789 |
NTE789
Integrated Circuit
Stereo Multiplex Decoder
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–dis-
tortion preamplifier and simultaneously applied to both signal, generated by a local voltage–controlled oscilla-
tor (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 gener-
ated 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 ap-
plied 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.
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