IC 74LS624 - High Frequency TTL voltage-controlled clock generator
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V+ = 5 Volts. If necessary for galvanic resons, analog and digital can have separate V+ power. It has two inputs for voltage-control : FC and FR. This is very convenient, because one input can have a potentiometer to set the frequency-range, while the other can be the input (R) for a control voltage. The output(s) can drive directly the clock input of most microprocessors. |
If two VCO's are needed, there's the 124 type :
| Only difference with the 624 type : no inversed output. Other lines function the same. |