ICS844N255I Datasheet, PDF (13/21 Pages) Integrated Device Technology – Six differential LVDS clock outputs

ICS844N255I Data Sheet
FEMTOCLOCK^® NG CRYSTAL-TO-LVDS CLOCK SYNTHESIZER
Overdriving the XTAL Interface
The XTAL_IN input can be overdriven by an LVCMOS driver or by one
side of a differential driver through an AC coupling capacitor. The
XTAL_OUT pin can be left floating. The amplitude of the input signal
should be between 500mV and 1.8V and the slew rate should not be
less than 0.2V/nS. For 3.3V LVCMOS inputs, the amplitude must be
reduced from full swing to at least half the swing in order to prevent
signal interference with the power rail and to reduce internal noise.
Figure 2A shows an example of the interface diagram for a high
speed 3.3V LVCMOS driver. This configuration requires that the sum
of the output impedance of the driver (Ro) and the series resistance
(Rs) equals the transmission line impedance. In addition, matched
termination at the crystal input will attenuate the signal in half. This
can be done in one of two ways. First, R1 and R2 in parallel should
equal the transmission line impedance. For most 50Ω applications,
R1 and R2 can be 100Ω. This can also be accomplished by removing
R1 and changing R2 to 50Ω. The values of the resistors can be
increased to reduce the loading for a slower and weaker LVCMOS
driver. Figure 2B shows an example of the interface diagram for an
LVPECL driver. This is a standard LVPECL termination with one side
of the driver feeding the XTAL_IN input. It is recommended that all
components in the schematics be placed in the layout. Though some
components might not be used, they can be utilized for debugging
purposes. The datasheet specifications are characterized and
guaranteed by using a quartz crystal as the input.
VCC
R1
100
Ro
Rs
Zo = 50 ohms
R2
Zo = Ro + Rs
100
LVCMOS Driver
XTAL_OUT
C1
XTAL_IN
.1uf
Figure 2A. General Diagram for LVCMOS Driver to XTAL Input Interface
XTAL_OUT
Zo = 50 ohms
Zo = 50 ohms
LVPECL Driver
R1
R2
50
50
R3
50
C2
XTAL_IN
.1uf
Figure 2B. General Diagram for LVPECL Driver to XTAL Input Interface
ICS844N255AKILF REVISION A NOVEMBER 23, 2011
13
©2011 Integrated Device Technology, Inc.