Cypress manual SSCG Profiles, Application Schematic, CY25818/19, CY25818 CY25819

CY25818/19

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.

Figure 7. CY25819 Spread Spectrum Profile

(Frequency vs. Time)[4]

Figure 6. CY25818 Spread Spectrum Profile

(Frequency vs. Time)[3]

Application Schematic

Vdd

C3 0.1 uF

7

C2	1
27 pF	14.3 MHz

XIN

Vdd

SSCLK

4

C3	or
	27.0 MHz

8

27 pF

6

XOUTREFCLK

CY25818

CY25819

PD#

S0

Vss

2

14.3MHz (CY25818)

5 27.0 MHz (CY25819)

3

Figure 8. Typical Application Schematic

Notes:

3.XIN = 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%

Document #: 38-07362 Rev. *B Page 5 of 7

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