SI5315-EVB Silicon Laboratories Inc, SI5315-EVB Datasheet - Page 41

• Manufacturer Part Number: SI5315-EVB
• Description: BOARD EVAL SI5315 8KHZ-644.53MHZ
• Manufacturer: Silicon Laboratories Inc

Specifications of SI5315-EVB

• Main Purpose: Timing, Clock Multiplier
• Embedded: No
• Utilized Ic / Part: SI5315
• Primary Attributes: 2 Inputs, 2 Outputs
• Secondary Attributes: CML, CMOS, LVDS, LVPECL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

6. Crystal/Reference Clock Input
The device can use an external crystal or external clock as a reference. If an external clock is used, it must be ac
coupled. With appropriate buffers, the same external reference clock can be applied to CKINn. Although the
reference clock input can be driven single ended (See Figure 17), the best performance is with a crystal or low
jitter, differential clock source. No external loading capacitors are required for normal crystal operation.
External Clock Source
LVPECL, CML, etc.
Figure 19. Differential External Reference Clock Input Example
Figure 18. Sinewave External Reference Clock Input Example
3.3 V
8 mA output current
0 dBm into 50 
CMOS buffer,
Figure 17. CMOS External Reference Circuit
For 2.5 V operation, change 130  to 82 .
100
130 

50 
0.01 F
3.3 V
150 
Rev. 0.26
150 
0.1 F
0.01 F
0.01 F
0.01 F
0.1 F
0.1 µF
XB
XA
XA
XA
XB
XB
10 pF
Si5315
Si5315
10 k
Si5315
10 k
0.6 V
0.6 V
10 k
10 k
0.6 V
1.2 V
1.2 V
Si5315
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