S3524A

The S3524A has the following features including 2600Hz Center Frequency With 70Hz Bandwidth;Small 8-Pin Minidip Package;Operation From a Low Cost 3.58MHz TV Color-burst Crystal or External Clock;Input Comparator for Squaring and Sensitivity Adjustment;Low Power CMOS Technology.

The S3524 is a digital Frequency Detector used to accurately determine if an incoming tone is within a set of predefined limit frequencies. It checks every period of the incoming signal, giving a true output for each period falling within the desired bandwidth.The S3524A, using a 3.58 MHz  clock,  will detect a 2600Hz frequency within 70Hz bandwidth. It is primarily designed to follow the S3526B 2600Hz bandpass filter as shown in Figure 4.The detector output. Open drain type output for ease of interface. DET OUT will be high after one full cycle of valid signal is detected,and will remain high until an out of frequency cycle is detected.Input comparator for setting sensitivity and squaring of analog signals. Signal sensitivity of S3524A is controlled by selecting external resistors.Oscillator terminals for 3.58MHz reference crystal or clock. Uses standard TV crystal or a rail-to-rail CMOS clock may be used.

The S3524A described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for any use that includes fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for any use where chance of failure is intolerable (i.e., submersible repeater and artificial satellite).