SI5315B-C-GMR Silicon Laboratories Inc, SI5315B-C-GMR Datasheet - Page 44

• Manufacturer Part Number: SI5315B-C-GMR
• Description: IC CLOCK MULT 8KHZ-125MHZ 36QFN
• Manufacturer: Silicon Laboratories Inc

Specifications of SI5315B-C-GMR

• Input: *
• Output: *
• Frequency - Max: *
• Voltage - Supply: *
• Operating Temperature: *
• Mounting Type: Surface Mount
• Package / Case: 36-VQFN
• Frequency-max: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si5315
7. Power Supply Filtering
This device incorporates an on-chip voltage regulator with excellent PSRR to power the device from a supply
voltage of 1.8, 2.5, or 3.3 V. The device requires minimal supply decoupling and no stringent layout or ground plane
islands. Internal core circuitry is driven from the output of this regulator while I/O circuitry uses the external supply
voltage directly. Table 3, “AC Characteristics” gives the sensitivity of the on-chip oscillator to changes in the supply
voltage. Refer to the Si5315 evaluation board for an example.
The center ground pad under the device must be electrically and thermally connected to the ground plane.
See Figure 26, “Ground Pad Recommended Layout,” on page 54.
44
Figure 22. Fout = 155 MHz with 112 Hz Loop Bandwidth, 100 mVp-p Supply Noise
-100
-105
-60
-65
-70
-75
-80
-85
-90
-95
1
(1.8, 2.5, or
Figure 21. Typical Power Supply Bypass Network
System
Supply
Power
3.3 V)
Power Supply Noise to Output Transfer Function
10
Ferrite
Bead
Frequency of Power Supply Noise (kHz)
Rev. 0.26
V
DD
Si5315
1.0 uF
0.1 uF
GND Pad
C
100
C
GND &
4
1
– C
3
1000