The SiT3522 is an ultra-low jitter, user programmable oscillator which offers the system designer great flexibility and functionality. The device supports two in-system programming options after powering up at a default, factory programmed startup frequency:
- Any-frequency mode where the clock output can be reprogrammed to any frequency between 340 MHz and 725 MHz in 1 Hz steps
- Digitally controlled oscillator (DCO) mode where the clock output can be steered or pulled by up to ±3200 ppm with 5 to 94 ppt (parts per trillion) resolution.
A user specifies the device’s default start-up frequency in the ordering code. User programming of the device is achieved via I2C or SPI. Up to 16 I2C addresses can be specified by the user either as a factory programmable option or via hardware pins, enabling the device to share the I2C with other I2C devices.