This chip is a completely modern, microprocessor-based design that provides a fully voltage controlled looping ADSR envelope generator.The output from the chip is a PWM pulse train which only requires simple lowpass filtering to produce a genuine ADSR envelope shape. In addition to full voltage control of Attack, Decay, Sustain, and Release, the chip also has CV control of output level (envelope depth) and an overall Time CV which can modulate the length of the entire envelope. DIP14 enclosure.
Here is the link to the datasheet
And here you can find further Details