Cypress CY25819 - Manual (Page 5)

CY25818/19
Document #: 38-07362 Rev. *B Page 5 of 7
SSCG Profiles
CY25818/19 SSCG products use a non-linear “optimized”
frequency profile as shown in Figure 6 and Figure 7. The use
of Cypress proprietary “optimized” frequency profile maintains
flat energy distribution over the fundamental and higher order
harmonics. This results in additional EMI reduction in
electronic systems.
Application Schematic
Notes:
3. X
IN
= 16.0 MHz; S0 = 1; SSCLK = 16.0 MHz; BW = –2.14%.
4. Xin = 32.0MHz; S0 = 1; SSCLK = 32.0 MHz; BW = -2.15%
Figure 6. CY25818 Spread Spectrum Profile
(Frequency vs. Time) [3]
Figure 7. CY25819 Spread Spectrum Profile
(Frequency vs. Time)
[4]
Vdd
1
8
14.3 M Hz
or
27.0 M Hz
Vss
S0
XIN
XOUT
SSCLK
Vdd
CY25818
CY25819
3
4
0.1 uF C3
C2
C3
27 pF
27 pF
14.3 MHz (CY25818)
27.0 MHz (CY25819)
REFCLK
5
2
7
PD#
6
Figure 8. Typical Application Schematic
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