SI5356-EVB Silicon Laboratories Inc, SI5356-EVB Datasheet - Page 15

• 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

3.11. Spread Spectrum
To reduce electro magnetic interference (EMI), the
Si5356 supports spread spectrum modulation. The
output clock frequencies can be modulated to spread
energy across a broader range of frequencies, lowering
system EMI. The modulation rate is the time required to
transition
frequency to the minimum spread spectrum frequency
and then back to the maximum frequency.
The Si5356 implements spread spectrum using
patented MultiSynth technology to achieve previously
unattainable precision in both modulation rate and
spreading magnitude as shown in Figure 9. This
enables the Si5356 to provide “triple A” spread
spectrum. Spread spectrum can be applied to any
from
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
-10%
the
maximum
-8%
Figure 9. Configurable Spread Spectrum
-6%
spread
-4%
spectrum
Preliminary Rev. 0.3
-2%
Relative Frequency
output clock, any clock frequency, and any spread
amount. Spread spectrum can be enabled or disabled
on a per-bank basis. The device supports center spread
(±0.1% to ±5%) and down spread (–0.1% to –5%). In
addition, the device has extensive on-chip voltage
regulation such that power supply variation does not
influence
waveforms.
The programming of Spread Spectrum is made easy by
using the Si5356 Programmer. Spread spectrum on all
the outputs can be enabled or disabled using the
SSC_DIS pin, or independently for each output bank
through the I
0%
±1.0%
2%
No spread
±2.5%
the
2
C interface.
4%
device’s
±5.0%
6%
spread
8%
spectrum
10%
Si5356
clock
15