ICL8038 Sine/ Triangular/Square Wave Signal Generator Module 10-300kHz is an Integrated circuit by Intersil designed to generate Sine, Square and Triangular/Delta waveforms. It is based on bipolar monolithic technology involving Schottky barrier diodes. The ICL8038 has a voltage-controlled oscillator which is capable of producing frequencies between a millihertz and 100kHz. Triangular waves were produced by charging and discharging a capacitor with constant currents.

 

The triangular waves were converted to sine waves involving a non-linear network. The output frequency is set either by resistors or the external control voltage. The temperature drift can be optimized to less than 250ppm/°C by combining it with a PLL.