SI5356-EVB Silicon Laboratories Inc, SI5356-EVB Datasheet - Page 9

• Manufacturer Part Number: SI5356-EVB
• Description: EVALUATION BOARD FOR SI5356
• Manufacturer: Silicon Laboratories Inc

Specifications of SI5356-EVB

• Main Purpose: Timing, Clock Generator
• Utilized Ic / Part: SI5356
• Technology Type: Evaluation Board
• For Use With/related Products: Si5356
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1750

3. Functional Description
3.1. Overview
The Si5356 is a highly flexible, I
generator capable of synthesizing four independent
frequencies up to 200 MHz. The device has four banks
of outputs with each bank supporting two CMOS
outputs at the same frequency. The Si5356 supports
free-running mode of operation using an external
crystal, or it can lock to an external clock for generating
synchronous clocks. The output drivers support 1.8, 2.5,
and 3.3 V CMOS formats, and each output bank is
independently configurable. Adjustable output-to-output
phase offsets are also available to compensate for PCB
trace delays or for fine tuning of setup and hold
margins.
Configuration and control of the Si5356 is handled
through the I
provides the option of storing a user-definable clock
configuration in its non-volatile memory (NVM), which
becomes the default clock configuration an power-up.
See
Configuration" on page 11 for details.
3.1.1. ClockBuilder™ Desktop Software
To simplify device configuration, Silicon Labs has
released the ClockBuilder Desktop. The software
serves two purposes: to configure the Si5356 with
optimal configuration based on the desired frequencies,
and to control the EVB, when connected to a host PC.
section
2
C/SMBus interface. The device also
"3.5.1.
Ordering
2
C programmable clock
a
Custom
Preliminary Rev. 0.3
NVM
The optimal configuration can be saved from the
software in text files that can be used in any system,
which configures the device over I
Desktop can be downloaded from www.silabs.com/
ClockBuilder and runs on Windows XP, Windows Vista,
and Windows 7. Additionally, an NVM file can be
generated
Programming... menu option. An NVM file can be used
by factory to prepare custom pre-programmed devices.
3.2. Input Configuration
The Si5356 input can be driven from either an external
crystal or a reference clock. If the crystal input option is
used, the Si5356 operates as a free-running clock
generator. In this mode of operation the device requires
a low cost 25 or 27 MHz fundamental mode crystal
connected across XA and XB as shown in Figure 1.
Given the Si5356’s frequency flexibility, the same crystal
can be reused to generate any combination of output
frequencies. Custom frequency crystals are not
required. The Si5356 integrates the crystal load
capacitors on-chip to reduce external component count.
The crystal should be placed very close to the device to
minimize stray capacitance. To ensure a stable and
accurate output frequency, the recommended crystal
specifications provided in Table 5 on page 7 must be
followed. See AN360 for additional details regarding
crystal recommendations.
using
the
NVMSave
2
C. ClockBuilder
Si5356
for
Factory
9