The SiT5156 from SiTime is a MEMS Super-TCXO that operates from 1 to 60 MHz. It has a step size of 1 Hz and frequency stability of ±2.5 ppm. The oscillator provides an LVCMOS or clipped sinewave output with a phase noise of -154 dBc/Hz @ 100 kHz offset. It leverages SiTime’s unique DualMEMS temperature sensing and TurboCompensation technologies to deliver the best dynamic performance for timing stability in the presence of environmental stressors due to airflow, temperature perturbation, vibration, shock, and electromagnetic interference. These features make the SiT5146 suitable for high-reliability telecom, wireless and networking, industrial, precision GNSS, and audio/video applications. It requires a DC supply voltage of 2.5 V/2.8 V/3.0 V/3.3 V and consumes less than 57 mA of current.
The SiT5156 has multiple on-chip regulators to filter power supply noise, eliminating the need for a dedicated external LDO. It supports digital frequency pulling (DCTCXO) via an I2C interface. The oscillator can be factory programmed for any combination of frequency, stability, voltage, and pull range which enables designers to optimize clock configurations while eliminating long lead times and customization costs associated with quartz devices where each frequency is custom-built.
This oscillator is available in a surface-mount package that measures 5.0 x 3.2 mm and is ideal for use in precision GNSS systems, microwave backhaul, network routers and switches, professional audio & video equipment, storage & servers, and test & measurement applications.
