SI5315A-C-GM Silicon Laboratories Inc, SI5315A-C-GM Datasheet - Page 44
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SI5315A-C-GM
Manufacturer Part Number
SI5315A-C-GM
Description
IC CLK MULT 8KHZ-644.53MHZ 36QFN
Manufacturer
Silicon Laboratories Inc
Datasheet
1.SI5315B-C-GM.pdf
(58 pages)
Specifications of SI5315A-C-GM
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