描述 Description

The 8R45252I 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. The device is a member of the family of High Performance Clock Solutions from IDT.

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