Intersil ICL8038

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ICL8038 operation (simplified)

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 100kHz.[4]:2, some specimens capable of reaching 300kHz.[4]:1 The device has been discontinued by Intersil in 2002.[1][4]:1

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.[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.[4]:1

Maxim designed a copy of the ICL8038 and marketed it as the MAX038. Both devices have since been discontinued.[citation needed]


  1. ^ a b Santo, Brian (1 May 2009). "25 Microchips That Shook the World". IEEE Spectrum: Technology, Engineering, and Science News. Institute of Electrical and Electronics Engineers. Retrieved 7 January 2019.
  2. ^ "Precision Waveform Generator/Voltage Controlled Oscillator". Archived from the original on 7 January 2019. Retrieved 7 January 2019.
  3. ^ Horowitz, Paul; Hill, Winfield (9 April 2015). The art of electronics (Third ed.). Cambridge University Press. ISBN 9780521809269.
  4. ^ a b c d e f "ICL8083 Datasheet" (PDF). 5 February 2012. Archived from the original (PDF) on 7 January 2019. Retrieved 7 January 2019.