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T4224B-CC Datasheet(PDF) 3 Page - TEMIC Semiconductors |
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T4224B-CC Datasheet(HTML) 3 Page - TEMIC Semiconductors |
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3 / 17 page  U4224B TELEFUNKEN Semiconductors Rev. A3, 02-Apr-96 3 (17) Q1A, Q1B In order to achieve a high selectivity, a crystal is con- nected between the pins Q1A and Q1B. It is used with the serial resonance frequency of the time code transmitter (e.g. 60 kHz WWVB, 77.5 kHz DCF or 40kHz JG2AS). The equivalent parallel capacitor of the filter crystal is internally compensated. The compensated value is about 0.7 pF. If the full sensitivity and selectivity is not needed, the crystal filter can be substituted by a capacitor of 10 pF for DCF and WWVB and 22 pF for JG2AS. Q1A Q1B 94 8382 GND REC Rectifier output and integrator input: The capacitor C1 between REC and INT is the lowpass filter of the rectifier and at the same time a damping element of the gain control. REC GND 94 8374 DEC Decoder input: Senses the current through the integration capacitor C2. The dynamic input resistance has a value of about 420k W and is low compared to the impedance of C2. DEC GND 94 8376 SL AGC hold mode: SL high (VSL = VCC) sets normal func- tion, SL low (VSL = 0) disconnects the rectifier and holds the voltage VINT at the integrator output and also the AGC amplifier gain. VCC SL 94 8378 INT Integrator output: The voltage VINT is the control voltage for the AGC. The capacitor C2 between INT and DEC defines the time constant of the integrator. The current through the capacitor is the input signal of the decoder. INT GND 94 8375 FLA, FLB Lowpass filter: A capacitor C3 connected between FLA and FLB supresses higher frequencies at the trigger circuit of the decoder. FLB FLB 94 8377 |
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