YM3623B

The YM3623B is an LSI device, developed by YAMAHA, which receives and plays back the Digital Audio Interface Format signals that arc transferred between digital audio equipment.Use of the YM3623B eliminates the need for a special externally- mounted circuit for playback,thereby greatly facilitating the playback of Digital Audio signals.

Features of the YM3623B are:(1)silicon gate CMOS construction (low power consumption); (2)28-pin dual-inlinc package (DIP); (3)45V power supply.The VCO frequency appears at the ØA terminal in the VCO mode, and in the crystal mode,the oscillation frequency at the oA terminal equals that of the input clock at the XI terminal.The VCO oscillation frequency is related to the delay time of the element in the VCO oscillation circuit.Therefore, the frequency tends to fluctuate depending on changes in temperature or power source voltage. The time constant for the VCO pin needs to be reviewed, taking individual component differences into account.

The absolute maximum ratings of the YM3623B can be summarized as:(1)supply voltage:-0.3 to 7.0 V;(2)storage temperature:-50 to +125;(3)input voltage:Vss-0.3 to Vdd=0.5 V;(4)operating temperature:-20 to +75.During operation of the PLL, a pulse string is transmitted from the VCO pin as a result of phase comparison in the phase difference detection circuit.  This string is integrated in the externally attached CR and defined as the control voltage of the VCO oscillation circuit.As shown in the block diagram of the clock circuit, this becomes a gate voltage for the inverter of the ring oscillator circuit.The gate voltage changes with respect to resistance changes -> delay time changes -> oscillation frequency changes in this order.The oscillation frequency changes arc reflected into the phase comparator as feedback.

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