The LTC6903/LTC6904 are low power self contained digital frequency sources providing a precision frequency from 1kHz to 68MHz, set through a serial port. The LTC6903/ LTC6904 require no external components other than a power supply bypass capacitor, and they operate over a single wide supply range of 2.7V to 5.5V. The LTC6903/LTC6904 feature a proprietary feedback loop that linearizes the relationship between digital control setting and frequency, resulting in a very simple frequency setting equation: where OCT is a 4-bit digital code and DAC is a 10-bit digital code. The LTC6903 is controlled by a convenient SPI compatible serial interface. The LTC6904 uses an industry standard I2C compatible interface. Applications * Precision Digitally Controlled Oscillator * Power Management * Direct Digital Frequency Synthesis (DDS) Replacement * Replacement for DAC and VCO * Switched Capacitor Filter Clock * 1kHz to 68MHz Square Wave Output * 0.5% (Typ) Initial Frequency Accuracy * Frequency Error <1.1% Over All Settings * 10ppm/°C Typical Frequency Drift Over Temperature * 0.1% Resolution * 1.7mA Typical Supply Current (f < 1MHz, VS = 2.7V) * 2.7V to 5.5V Single Supply Operation * Jitter <0.4% Typical 1kHz to 8MHz * Easy to Use SPI (LTC6903) or I2C (LTC6904) Serial Interface * Output Enable Pin * –55°C to 125°C Operation * MS8 Package https://elecena.pl/product/262028/1khz-68mhz-serial-port-programmable-oscillator 2007-03-04 https://elecena.pl/product/262028/1khz-68mhz-serial-port-programmable-oscillator 2018-01-15 https://elecena.pl/product/262028/1khz-68mhz-serial-port-programmable-oscillator 2025-01-21