The NE567 tone and frequency decoder designed as a highly stable phase-locked loop with synchronous AM lock detection and power output circuitry. The most important function of PLL is to drive a load whenever a sustained frequency within its detection band present at the self-biased input. It operates in a wide frequency range 0.1 to 500 kHz providing high stability of center frequency. Along with Independently controllable bandwidth (up to 14%). Meanwhile, this device features high out-band signal and noise rejection Logic-compatible output with 100 mA current-sinking capability. Also, provide Inherent immunity to false signals and Frequency adjustment over a range 20-to-1 range with external components.
When NE567 functions as a tone-operated switch, its output switching delay are often varied over a good time range by the choice of external resistors and capacitors. The current-controlled oscillator of the 567 are often varied over a good frequency range with external resistor R1 and capacitor C1, but the oscillator are often controlled only over a really narrow range (a maximum of about 14% of the free-running value) by signals at pin 2. As a result, the PLL circuit can “lock” only to a really narrow range of preset input frequency values. The 567’s quadrature phase detector compares the relative frequencies and phases of the input and therefore the oscillator output. It produces a legitimate output.
APPLICATIONS:
- Touch-Tone decoding
- Carrier current remote controls
- Ultrasonic controls (remote TV, etc.)
- Communications paging
- Frequency monitoring and control
- Wireless intercom
- Precision oscillator
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