82V3380PFG IDT, Integrated Device Technology Inc, 82V3380PFG Datasheet - Page 48
82V3380PFG
Manufacturer Part Number
82V3380PFG
Description
Manufacturer
IDT, Integrated Device Technology Inc
Datasheet
1.82V3380PFG.pdf
(175 pages)
Specifications of 82V3380PFG
Function
Wan PLL
Operating Temperature (max)
85C
Operating Temperature (min)
-40C
Package Type
TQFP
Pin Count
100
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant
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3.17
required to minimize supply noise modulation of the output clocks. The
common sources of power supply noise are switch power supplies and
the high switching noise from the outputs to the internal PLL. The
82V3380 provides separate VDDA power pins for the internal analog
PLL, VDD_DIFF for the differential output driver circuit and VDDD pins
for the core logic as well as I/O driver circuits.
ing regulator, the power supply output should be filtering with sufficient
bulk capacity to minimize ripple and 0.1 uF (0402 case size, ceramic)
caps to filter out the switching transients.
and VDDD are handled individually. VDDD, VDD_AMI, VDD_DIFF and
VDDA should be individually connected to the power supply plane
through vias, and bypass capacitors should be used for each pin.
Figure 14 illustrated how bypass capacitor and ferrite bead should be
connected to power pins.
Functional Description
IDT82V3380
3.3V
To achieve optimum jitter performance, power supply filtering is
To minimize switching power supply noise generated by the switch-
For the 82V3380, the decoupling for VDDA, VDD_DIFF, VDD_AMI
SLF7028T-100M1R1
POWER SUPPLY FILTERING TECHNIQUES
10 µF
3.3V
SLF7028T-100M1R1
0.1 µF
10 µF
0.1 µF
Figure 14. IDT82V3380 Power Decoupling Scheme
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
48
0.1 µF
impedance. This can be achieved by using one 10 uF (1210 case size,
ceramic) and at least four 0.1 uF (0402 case size, ceramic) capacitors in
parallel. The 0.1 uF (0402 case size, ceramic) capacitors must be
placed right next to the VDDA and VDD_DIFF pins as close as possible.
Note that the 10 uF capacitor must be of 1210 case size, and it must be
ceramic for lowest ESR (Effective Series Resistance) possible. The 0.1
uF should be of case size 0402, this offers the lowest ESL (Effective
Series Inductance) to achieve low impedance towards the high speed
range.
ceramic) and one 10 uF (1210 case size, ceramic) capacitors are rec-
ommended. The 0.1 uF capacitors should be placed as close to the
VDDD pins as possible.
0.1 µF
The analog power supply VDDA and VDD_DIFF should have low
For VDDD and VDD_AMI, at least ten 0.1 uF (0402 case size,
Please refer to evaluation board schematic for details.
VDD_DIFF
VDD_AMI
VDDA
VDDD
IDT82V3380
26
6, 19, 91
12, 13, 16, 50, 61, 85, 86
33, 39
SYNCHRONOUS ETHERNET WAN PLL
11, 14, 15, 62, 84, 87
1, 5, 20, 92
32, 38
29
GND_DIFF
GND_AMI
DGND
AGND
May 19, 2009
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