813N252DI-02中文资料Jitter Attenuator & Femtoclock NG® Multiplier数据手册Renesas规格书

描述 Description

The 813N252I-02 device uses IDT's fourth generation FemtoClock® NG technology for optimal high clock frequency and low phase noise performance, combined with a low power consumption and high power supply noise rejection. The 813N252DI-02 is a PLL based synchronous multiplier that is optimized for PDH or SONET to Ethernet clock jitter attenuation and frequency translation.



The 813N252DI-02 is a fully integrated Phase Locked loop utilizing a FemtoClock NG Digital VCXO that provides the low jitter, high frequency SONET/PDH output clock that easily meets OC-48 jitter requirements. This VCXO technology simplifies PLL design by replacing the pullable crystal requirement of analog VCXOs with a fixed 27MHz generator crystal. Jitter attenuation down to 10Hz is provided by an external loop filter. 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 device requires the use of an external, inexpensive fundamental mode 27MHz crystal. The device is packaged in a space-saving 32-VFQFN package and supports industrial temperature range.

特性 Features

Fourth generation FemtoClock® NG technology
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
Crystal interface optimized for a 27MHz, 10pF parallel resonant crystal
Attenuates the phase jitter of the input clock by using a low-cost fundamental mode crystal
Customized settings for jitter attenuation and reference tracking using an external loop filter connection
FemtoClock NG frequency multiplier provides low jitter, high frequency output
Absolute pull range: ±100ppm
Power supply noise rejection (PSNR): -95dB (typical)
FemtoClock NG VCXO frequency: 2500MHz
RMS phase jitter @ 156.25MHz, using a 27MHz crystal (12kHz '- 20MHz): 0.6ps (typical)
RMS phase jitter @ 125MHz, using a 27MHz crystal (12kHz '- 20MHz): 0.63ps (typical)
3.3V supply voltage
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) package