Logic-compatible output with 100 mA current sinking capability, which allows the output to handle relatively higher loads without employing an additional buffer stage such as a transistor driver stage. High out-band signal, and noise rejection, which again assures high reliability during the detection and implementation of the said functions. Independently controllable bandwidth (up to 14%), as the feature suggests, the bandwidth is also adjustable to a reasonable degree. Highly stable of center frequency, which assures precise passband limits making the unit very reliable with the detection functions. Main Features of LM567:Įxtensive settable frequency range (0.01 Hz to 500 kHz), meaning the sensing passband may be set right from 0.1 to 500 kHz, giving an option of a huge range so that unlimited unique configuration can be achieved from this chip. Pin#1 and pin#2 are used for ensuring proper filtration of the involved frequencies so that the IC does not create any false output due to any existing spurious or stray noise interferences. Output Pin#8 is normally logic high and becomes logic zero as soon as a matching frequency is detected at pin#3 of the IC. The Pin#5 and 6 are used for creating the center frequency by setting up the values of R1, C1 as required, and this frequency is used by the sensing input pin#3 to lock-in and create a logic zero at pin#8 which is the output pin of the IC. Pin#3 is the sensing input of the input, which is used for detecting a given phase-locked loop frequency, in other words this pin will lock-on with the matching center frequency which may be set inside the IC through a pair of external RC network. Pin#4 and Pin#7 are the positive (Vdd) and the negative (Vss) supply inputs respectively for the IC. Referring to the the above shown IC LM 567 internal configuration diagram, the pinout function of the IC may be understood from the following points: The following table explains the absolute maximum rating of the IC LM567 for the relevant parameters: Pinout Working and Specifications
Block Diagram Absolute Maximum RatingĪbsolute maximum rating refers to the values indicating the maximum tolerable capacity of the IC in terms of voltage, current, and power dissipation.
Needless to say this chip can be used for a number of different applications, the most common being in the field of remote controls, and security systems. In simpler terms the IC LM567 IC is a tone decoder chip which is designed basically for recognizing a specified frequency band, and activating the output in response to the detection.
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