SI5040-EVB datasheet(6/24 Pages) SILABS

Numer części	SI5040-EVB

Szczegółowy opis	Four selectable on-chip reference frequencies

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Producent	SILABS [Silicon Laboratories]

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Si5040-EVB

6

Rev. 0.4

attenuates the RD signal, which requires that the RD

signal level from the Si5040 be slightly increased.

Please use the Si5040 Register 56 to increase the RD

drive signal from its default value of 600 mV to either

700 or 800 mV.

See the Si5040 datasheet for more

information. The circuit that is implemented on the EVB

is shown below:

Figure 8. EVB Pre-Emphasis Circuit

Within an XFP module, the pre-emphasis circuit should

be located as close to the Si5040 RD± pins as is

practical. In an XFP module, the pre-emphasis circuit

above can be modified to remove one component yet

still behave the same electrically. The following circuit

shows this simplification.

Figure 9. Recommended XFP Pre-Emphasis Circuit

Should you not like the eye pattern at the RD± pins, this

circuit can be easily optimized for your application. If

you wish assistance in this matter, please contact Siicon

Laboratories.

1.7. Start Up Script(s)

1.7.1. For Evaluation Boards Populated with the

Rev. A Device

It is necessary to load the scripts included with the

evaluation board software at startup and after any reset

of the Si5040 Rev A. The default name for the initialization

script is "Si5040InitialRegisterMapSettings.txt". This

script will set up the Rev A device in Mode 0, the

Reference-less operation mode.

If you need to set up the Rev A device in Mode 3, the

jitter

attenuation

mode

with

external

crystal

"Mode3OvtInit.txt" script needs to be loaded after

"Si5040InitialRegisterMapSettings.txt" is first loaded.

Note that these scripts should be loaded by using the

Register Programmer. See "2.5. Si5040 EVB Software

Description" on page 8 for more information on the

Register Programmer.

1.7.2. For Evaluation Boards Populated with the

Rev. B Device

Starting Oct 2006, no initialization script is required for

Mode 0 operation. However, in order for the interrupt pin

to function properly on the evaluation board, Register 2

needs to be set to 18h (default=58h) by using the

Register Programmer. Note that this is to set the

interrupt output driver as CMOS as the evaluation board

does not have an external pullup on the interrupt signal.

If you need to set up the Rev B device in Mode 3,

Register 134 needs to be set to 3h (default=30h) by

using the Register Programmer, or simply go to System

Programmer and click on the TX CDR/CMU Control link

in the block diagram. Then, choose "Mode 3" from the

"cmuMode" pull-down menu.

20.5

3.0 pF

5040

RD+

XFI RD+

274



.01 uF

20.5

3.0 pF

5040

RD-

274



.01 µF

XFI RD-

20.5

3.0 pf

504 0 R D +

XFI R D +

20.5

3.0 pf

504 0 R D -

2 74



XFI R D -

.0 1 µ F

274



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