845252I中文资料FemtoClock Crystal-to-CML Clock Generator数据手册Renesas规格书

描述 Description

The 845252I is a 3.3V/2.5V CML clock generator designed for Ethernet applications. The device synthesizes either a 50MHz, 62.5MHz, 100MHz, 125MHz, 156.25MHz, 250MHz or 312.5MHz clock signal with excellent phase jitter performance. The clock signal is distributed to two low-skew differential CML outputs. The device is suitable for driving the reference clocks of Ethernet PHYs. The device supports 3.3V and 2.5V voltage supply and is packaged in a small, lead-free (RoHS 6) 32-lead VFQFN package. The extended temperature range supports telecommunication, wireless infrastructure and networking end equipment requirements.

特性 Features

Clock generation of: 50MHz, 62.5MHz, 100MHz, 125MHz, 156.25MHz, 250MHz and 312.5MHz
Two differential CML clock output pairs
Crystal interface designed for 25MHz, 18pF parallel resonant crystal
RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz – 20MHz): 400fs (typical), 3.3VOffset                       Noise Power  100Hz................... -102.4 dBc/Hz    1kHz................... -119.4 dBc/Hz  10kHz................... -124.8 dBc/Hz100kHz................... -125.7 dBc/Hz
LVCMOS interface levels for the control inputs
Full 3.3V and 2.5V supply voltage
Available in lead-free (RoHS 6) 32 VFQFN package
-40°C to 85°C ambient operating temperature