The DS4026 is a temperature-compensated crystal oscillator (TCXO) that provides 1ppm frequency stability over the -40C to +85C industrial temperature range. Each device is factory calibrated over temperature to achieve the 1ppm frequency stability. Standard frequencies for the device include 12.8, 19.44, 20.0, 38.88, 40.0, and 51.84MHz. Contact the factory for custom frequencies. The DS4026 provides excellent phase-noise characteristics. The output is a push-pull CMOS square wave with symmetrical rise and fall times. In addition, the DS4026 is designed to provide a maximum frequency deviation of less than 4.6ppm over 10 years. The device also provides an I2C interface to allow pushing and pulling of the output frequency by a minimum of 8ppm (5ppm for 10MHz) with typical 1ppb resolution. The DS4026 implements a temperature-to-voltage conversion with a nonlinear relationship. The output from the temperature-to-voltage converter is used to drive the voltage-controlled crystal oscillator to compensate for frequency change.