Intersil ICL8038

The ICL8038 waveform generator was an Integrated circuit by Intersil designed to generate sine, square and triangular waveforms,[1] based on bipolar monolithic technology involving Schottky barrier diodes.

[2] ICL8038 was a voltage-controlled oscillator[3]: 434  capable of producing frequencies between a millihertz and 100 kHz.,[4]: 2  some specimens capable of reaching 300 kHz.

[1][4]: 1 Triangular waves were produced by charging and discharging a capacitor with constant currents.

[4]: 4  The output frequency was set either by resistors or the external control voltage.

[4]: 6  The temperature drift could be optimized to less than 250ppm/°C by combining it with a PLL.