Five frequency-standard frequency standard circuit

Published:2011/6/26 20:38:00 Author:TaoXi | Keyword: Five frequency-standard, frequency standard circuit | From:SeekIC

The five frequency-standard frequency standard circuit uses the DT direction cutting crystal in the NOT gate oscillator U1A and the divider chains U2-U6, and it produces the frequency standard at the frequencies of 200,100,50,25,10,5 kHz. The U2A-U3B are connected into the D trigger to produce the circuit of 2 frequency division. The U4 is the N frequency divider, the latch circuit of U5 can be used to reset the selective logic of 5 frequency division. The 100kHz output produces the symmetrical 10kHz output through the 5 and 2 frequency divisions, then the output changes into the 5kHz output through 2 frequency division. The CMOS CD4000 series logical components reduces the current of 9V battery to 2.8mA, but it still has enough switching speed and harmonic energy, and it has good phase reaction in the high frequency bands.



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