|
SiTime's MEMS timing solutions have a flexible architecture that is supported by factory programmability. This flexible architecture allows customers to order a device configured to meet their exact design specifications, and receive samples within one week and production volume within three to five weeks. By using these features, a customer can eliminate multiple suppliers and qualification efforts. The result is lower cost of ownership and a simplified supply chain. |
Widest Range of Features
SiTime offers the industry’s widest range of timing solutions available. Within each product category, designers can select from an extremely wide range of features. For a list of available products and options, see SiTime’s Product Selector Guide or Part Number Generator.
| Feature | Configuration Options |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Programmable Frequency
By using Frac-N PLLs, SiTime's oscillators can offer any frequency within the operating range with up to 6 decimal places of accuracy. With custom frequencies a user can increase performance (microprocessor / FPGA applications) and reduce bit error rates (Ethernet applications). Customized samples of products are delivered within 1 week with production quantities in 3-5 weeks.
Supply Voltage
Covering the most common input-output voltages used, SiTime’s products can operate at 1.8 volts and at any voltage between 2.5 and 3.3 volts. All of these voltage levels are available across the entire frequency range, which is a feature that quartz-based solutions cannot offer. Because these products can be configured to operate at the required voltage, external components such as level translators or additional regulators are not required, thus reducing board space and cost.
Frequency Stability
SiTime’s MEMS timing devices offer a range of frequency stability options. For applications that require ultra-stable frequency control, SiTime offers ±0.5 PPM stability in TCXO and VCTXO families that operate over the full industrial temperature range. For the most demanding telecom and networking applications, SiTime offers Stratum 3 level stability with ±0.5 PPM devices. Even within each product category (XO, VCXO, VCTCXO, etc.), a variety of frequency stability options are available to best meet the application requirement with the lowest cost.
Spread Spectrum
SiTime offers spread-spectrum capability with center-spread and down-spread options, as well as different values of spreading, in differential, low-power or high-performance oscillators. This feature provides an excellent solution for easily solving EMI problems. Usually, EMI problems are detected at the last stage of development. At that time, the only options that may be available are to redesign / relayout the board or put shielding within the case, both of which are expensive. SiTime's spread-spectrum devices, which are pin-compatible with oscillators, can solve the problem without system redesign or expensive shielding. Learn more about reducing EMI with Spread Spectrum Clock Oscillators.
Digital Control
Digitally-controlled oscillators (DCXOs) are ideal for jitter cleaning and fail-safe functions in high-speed applications. The features of these devices are controlled by programming appropriate values serially, in-system. DCXOs eliminate the need for an external digital-to-analog converter (DAC) in the control path. This reduces board complexity and improves performance, as system noise is much lower. SiTime's DCXOs are serially programmable and use a single-pin (1-wire interface).
Pull Range (plus Linearity)
SiTime offers the widest pull range (±25 to ±1600 PPM) with the industry's best linearity at 1%. In SiTime’s voltage-controlled oscillators (VCXOs), voltage-controlled, temperature-compensated oscillators (VCTCXOs) and digitally-controlled oscillators (DCXOs), the programmability of the device allows easy configuration of the pull range. Industry-standard pull ranges up to ± 200 PPM are also available. The superior tuning slope (Kv) consistency and linearity of SiTime oscillators enable a host of benefits including simpler loop control in software controlled PLLs, faster calibration and lock time, more consistent PLL bandwidth over operating range, reduced modulation harmonics, tighter PLL bandwidth design and more robust system performance. Compared to quartz devices with pull range limited up to ±200 PPM and linearity at 10%, SiTime's MEMS timing devices are 8 times and 10 times better respectively.
Output Drive Strength
All of SiTime’s products have programmable drive strength control using SoftEdge technology. This feature allows designers to accurately match the output impedance of the oscillator with the trace impedance of the board to reduce reflections. Higher drive strength can be selected to drive multiple loads and eliminate external buffers. Lower drive strength can be used to improve signal integrity and reduce EMI.
Field Programmable Prototyping
SiTime offers The Time Machine, a complete programming kit for MEMS-based silicon timing devices. This kit allows system designers to quickly and easily program oscillators according to the specifications and configuration required. Using field programmable devices, design-specific samples can be generated in less than a minute.·
