特性
- Two LVPECL output pairs each output supports independent frequency selection at 25MHz, 125MHz, 156.25MHz, and 312.5MHz
- Two differential inputs support the following input types: LVPECL, LVDS, LVHSTL, SSTL, HCSL
- Accepts input frequencies from 8kHz to 155.52MHz including 8kHz, 1.544MHz, 2.048MHz, 19.44MHz, 25MHz, 77.76MHz, 125MHz, and 155.52MHz
- Attenuates the phase jitter of the input clock by using a low-cost pullable fundamental mode VCXO crystal
- VCXO PLL bandwidth can be optimized for jitter attenuation and reference tracking using an external loop filter connection
- FemtoClock frequency multiplier provides a low-jitter, high-frequency output
- Absolute pull range: 50ppm
- FemtoClock VCO frequency: 625MHz
- RMS phase jitter at 125MHz, using a 25MHz crystal (12kHz - 20MHz): 0.25ps (typical) and 0.35ps (maximum)
- 3.3V supply voltage
- -40 °C to 85 °C ambient operating temperature
- Available in lead-free (RoHS 6) package
描述
The 813N252I-09 is a PLL-based synchronous multiplier optimized for PDH or SONET to Ethernet clock jitter attenuation and frequency translation. The device contains two internal frequency multiplication stages that are cascaded in series. The first stage is a VCXO PLL that is optimized to provide reference clock jitter attenuation. The second stage is a FemtoClock® frequency multiplier that provides the low jitter, high-frequency Ethernet output clock that easily meets Gigabit and 10 Gigabit Ethernet jitter requirements. Pre-divider and output divider multiplication ratios are selected using device selection control pins. The multiplication ratios are optimized to support most common clock rates used in PDH, SONET, and Ethernet applications. The VCXO requires the use of an external, inexpensive pullable crystal. The VCXO uses external passive loop filter components which allows configuration of the PLL loop bandwidth and damping characteristics. The device is packaged in a space-saving 32-VFQFN package and supports the industrial temperature range.
Download the Altera and IDT Synchronous Ethernet Solution for ITU-T G.8262 white paper