PECL stands for “Positive Emitter Coupled Logic”. PECL are differential logic outputs commonly used in high-speed clock distribution circuits. Low Voltage PECL (LVPECL) denotes PECL circuits designed for use with 3.3V or 2.5V supply, the same supply voltage as for low voltage CMOS devices….
Side Pads on Crystal Oscillators
Side pads are metal pads on the side of crystal oscillator packages. Pads are generally on the short side of the package. Side pads are used to measure electrical characteristics of crystal blanks after assembly in order to further assure quality of the blanks before shipment….
Utilize Clipped Sine Waveform in Circuit Design
Clipped sine waveform is the most popular output option for TCXOs. Low power consumption for improved thermal characteristics :Better aging and frequency stability performance. Better phase noise performance than CMOS output….more
Tri-State Function in Crystal Oscillators
In oscillator with Tri-state function, oscillator output can be controlled by the Tri-state pin as follows: Logic High : Output Enable ; Logic Low : Output Disable. The Tri-state function would allow output pin to assume high-impedance state, effectively removing the oscillator output from the circuit. Oscillator circuits can remain on or be turned off while output is disabled in Tri-State….more
Inverted MESA Blank
Oscillator frequency is inversely proportional to the thickness of the crystal blank. The higher the frequency, the thinner the crystal blanks. Inverted Mesa technology creates a region on the crystal blank much thinner than polished blanks for resonating. Thicker crystal material surrounding the “well” provides robust structural support for better reliability. Inverted Mesa blanks can be used in crystals, crystal oscillators and VCXOs for high fundamental frequency applications. …more
How to Minimize EMI effect on Crystal Oscillators
For TATIEN crystal oscillators, top metal covers are electrically connected to GND terminals. The metal covers provide effective shielding against EMI from ASIC inside the oscillator. …more