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The '''CEM3340''' and '''CEM3345''' are a self contained [[VCO]], originally produced by [[OnChip Systems|Curtis Electromusic Specialties]]. With both [[exponential]] and [[linear]] control inputs and up to four output waveforms: [[triangle]], [[sawtooth]], [[square]], and [[pulse]] with voltage controllable [[pulse width]]. It has full temperature compensation making it extremely stable. Also included is provision for [[oscillator sync|hard and soft synchronization]] of the [[frequency]], and an output for easy adjustment of [[VCO high frequency tracking|high frequency tracking]].<ref name="
== CEM3340/3345 differences ==
* The square wave output on the CEM3345 (pin 7) requires a pull down resistor to any negative supply greater than -4 volts.
* The frequency control is pin 15 on the CEM3340, pin 17 on the CEM3345.
* The precision multiplier output is pin 14 on the 3340, pin 16 on the 3345.
* The reference current input is pin 13 on the 3340, pin 15 on the 3345.
* The hi-frequency track is pin 7 on the 3340, pin 8 on the 3345.
* The threshold voltage pin is pin 9 on the 3340, pin 10 on the 3345.<ref name="dslong"/>
== Clones and equivalents ==
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== Usage ==
== References ==
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