EP1S10F780I6N Altera, EP1S10F780I6N Datasheet - Page 336

• Manufacturer Part Number: EP1S10F780I6N
• Description: IC STRATIX FPGA 10K LE 780-FBGA
• Manufacturer: Altera
• Series: Stratix®r

Specifications of EP1S10F780I6N

• Number Of Logic Elements/cells: 10570
• Number Of Labs/clbs: 1057
• Total Ram Bits: 920448
• Number Of I /o: 426
• Voltage - Supply: 1.425 V ~ 1.575 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 780-FBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -

Enhanced PLLs
Figure 1–14. Spread-Spectrum Signal Energy versus Non-Spread-Spectrum Signal Energy
1–26
Stratix Device Handbook, Volume 2
Amplitude
(dB)
Spread-spectrum technology modulates the target frequency over a small
range. For example, if a 100-MHz signal has a 0.5% down-spread
modulation, then the frequency is swept from 99.5 to 100 MHz.
Figure 1–14
spread-spectrum signal as opposed to a non-spread-spectrum signal. It is
apparent that instead of concentrating the energy at the target frequency,
the energy is re-distributed across a wider band of frequencies, which
reduces peak energy.
Not only is there a reduction in the fundamental peak EMI components,
but there is also a reduction in EMI of the higher order harmonics. Since
some regulations focus on peak EMI emissions, rather than average EMI
emissions, spread-spectrum technology is a valuable method of EMI
reduction.
Spread-spectrum technology would benefit a design with high EMI
emissions and/or strict EMI requirements. Device-generated EMI is
dependent on frequency, output voltage swing amplitude, and slew rate.
For example, a design using LVDS already has low EMI emissions
Spread-Spectrum Signal
Non-Spread-Spectrum Signal
gives a graphical representation of the energy present in a
δ = 0.5%
Frequency
(MHz)
Δ = ~5 dB
Altera Corporation
July 2005