IDT8T49N524I中文資料瑞薩數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

General Description

The IDT8T49N524I is an eight output programmable any-rate dual

clock generator with selectable LVDS or LVPECL outputs. Both clock

generators use Fractional Output Dividers to be able to generate output frequencies that are independent of each other and independent

of the input frequency. Output frequencies for both clock generators

are generated from a single crystal or reference clock.

Clock Generator A supports three different factory-programmed

default frequencies that can be selected from using only the FSEL

control pins. Alternatively any desired output frequency can be

programmed over the I2C serial port. The chosen output frequency is

then driven out the QA0 to QA3 outputs.

Clock Generator B supports a single factory-programmed default

frequency. It can also be programmed for any output frequency via

the serial port. The output frequency is driven out the QB0 to QB3

outputs.

Some examples of frequency configurations that can be achieved

are shown in Table 5A. Please consult IDT for programming software

that can be used to determine the required settings for any desired

configuration.

Excellent phase noise performance is achieved with IDT’s fourth

Generation FemtoClock? NG PLL technology, which delivers

sub-0.5ps RMS phase jitter in the integer divide mode.

Features

? Fourth Generation FemtoClock? NG PLL technology

? Eight outputs selectable as LVPECL or LVDS

? Input selectable: fundamental mode crystal or clock reference

? Supports fundamental mode crystals from 10MHz - 40MHz

? CLK, nCLK input pair can accept the following differential input

levels: LVPECL, LVDS, HCSL

? Input frequencies from 5MHz up to 800MHz

? Two independent output frequencies can be generated

? Output frequencies independent of each other and of input

? Output frequencies from 15.234MHz - 645MHz, and

975MHz - 1290MHz, (See Table 5D for details)

? RMS phase jitter at 125MHz (12kHz - 20MHz): 0.282ps (typical)

? RMS phase jitter at 156.25MHz (12kHz - 20MHz):

0.278ps (typical)

? Full 2.5V or 3.3V power supply

? I

2C programming interface

? -40°C to 85°C ambient operating temperature

? Lead-free (RoHS 6) packaging

? VCC / VCCA / VCCO

3.3V / 3.3V / 3.3V

3.3V / 3.3V / 2.5V (LVPECL only)

2.5V / 2.5V / 2.5V