The ICL8038 waveform generator is a monolithic integrated circuit that can generate high-accuracy sine, square, triangular, sawtooth, and pulse waveforms with very few external components. External resistors or capacitors can be used to adjust the frequency (or repetition rate) from 0.001Hz to more than 300kHz, and an external voltage can be used to modulate and sweep the frequency. The output of the ICL8038 is stable over a wide range of temperature and supply variations, thanks to advanced monolithic technology that includes Schottky barrier diodes and thin film resistors. Temperature drift of less than 250ppm/oC can be achieved by combining these devices with phase locked loop circuitry.