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LM567CN Audio Video IC

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About this product

Overview

Product overview

Features:• Wide frequency range (0.01Hz to 500kHz)• High stability of centre frequency• Independently controllable bandwidth (0 to 14%)• High out-band signal and noise rejection• Logic compatible output with 100mA current sinking capability• Inherent immunity to false signals• Frequency adjustment over a 20 to 1 range with an external resistorApplications:• Carrier current remote controls• Ultrasonic controls (remote TV etc.)• Communications paging• Frequency monitoring and control• Wireless intercom• Precision oscillator

The LM567CN is general purpose tone decoder designed to provide a saturated transistor switch to ground when an input signal is present within the passband. The
circuit consists of an I and Q detector driven by a voltage controlled oscillator which determines the centre frequency of the decoder. External components are used to independently set centre frequency, bandwidth and output delay

Specification

Characteristics:
Max operating voltage: 10V
Positive voltage at input: 0.5V above supply
Negative voltage at input: -10Vdc
Output voltage: 15Vdc
Operating current range: 7mA (12mA activated)
Design Formulae:
f<->o = 1.1/R1.C1
where R1 is between 2kΩ and 20kΩ and f<->o is the centre frequency.
Bandwidth = 1070(V<->i/f<->o.C2) where V<->i is the input rms voltage. C3 = 2(C2).

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