Figure 14. IDT82V3288 Power Decoupling Scheme
參數(shù)資料
型號: IDT82V3288BCG
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 113/170頁
文件大?。?/td> 0K
描述: IC PLL WAN 3E STRATUM 2 208CABGA
標準包裝: 1
類型: 時鐘/頻率發(fā)生器,多路復(fù)用器
PLL:
主要目的: 以太網(wǎng),SONET/SDH,Stratum
輸入: CMOS,LVDS,PECL
輸出: CMOS,LVDS,PECL
電路數(shù): 1
比率 - 輸入:輸出: 14:9
差分 - 輸入:輸出: 是/是
頻率 - 最大: 622.08MHz
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 208-LBGA
供應(yīng)商設(shè)備封裝: 208-CABGA(17x17)
包裝: 托盤
其它名稱: 82V3288BCG
IDT82V3288
WAN PLL
Functional Description
47
March 14, 2007
3.17
POWER SUPPLY FILTERING TECHNIQUES
Figure 14. IDT82V3288 Power Decoupling Scheme
To achieve optimum jitter performance, power supply filtering is
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
82V3288 provides separate VDDA power pins for the internal analog
PLL, VDD_DIFF, VDD_155 and VDD_622 for the high-speed output
driver circuits and VDDD and VDD_AMI pins for the core logic as well as
I/O driver circuits.
To minimize switching power supply noise generated by the switch-
ing regulator, the power supply output should be filtering with sufficient
bulk capacity to minimize ripple and 0.1 uF (0402 case size, ceramic)
capacitors to filter out the switching transients.
For the 82V3288, the decoupling for VDDA, VDD_DIFF, VDD_155,
VDD_622, VDD_AMI and VDDD are handled individually. VDDA,
VDD_DIFF, VDD_155, VDD_622, VDD_AMI and VDDD should be indi-
vidually 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.
The analog and high-speed output driver circuits power supply
VDDA, VDD_DIFF, VDD_155 and VDD_622 should have low imped-
ance. This can be achieved by using one 10 uF (1210 case size,
ceramic) and at least sixteen 0.1 uF (0402 case size, ceramic) capaci-
tors in parallel. The 0.1 uF (0402 case size, ceramic) capacitors must be
placed right next to the VDDA, VDD_DIFF, VDD_155 and VDD_622 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 0.1uF should be of case size 0402, this offers
the lowest ESL (Effective Series Inductance) to achieve low impedance
towards the high speed range.
For VDDD and VDD_AMI, at least twenty-seven 0.1 uF (0402 case
size, ceramic) and one 10 uF (1210 case size, ceramic) capacitors are
recommended. The 0.1 uF capacitors should be placed as close to the
VDDD and VDD_AMI pins as possible.
Please refer to evaluation board schematic for details.
3.3V
IDT82V3288
3.3V
10
F
GND
VDDA
VDDD
SLF7028T-100M1R1
0.1
F
10
F
VDD_DIFF
0.1
F
0.1
F0.1 F
0.1
F0.1 F
0.1
F0.1 F
VDD_AMI
VDD_155
VDD_622
16 0.1uF capacitors
27 0.1uF capacitors
D2, D4, E2,
K4, L4, A6,
D7, D8
R9, R10,
R12, R13
M2, N2
R6, R7
P3, T3
F2, F4, G3, J1, K2, H2,
H3, M13, M16, N13, P14,
F16, H16, J13, K13, K16,
A10, D12, D13, F14, A8,
B8, D10, A2, A4
B1, B3, B5, B7, B9, C2,
C7, C8, D1, D5, D6, D9,
D11, E4, E13, F13, G2,
G4, G7, G8, G9, G10,
G13, G15, H1, H4, H7,
H8, H9, H10, H13, H14,
J2, J4, J7, J8, J9, J10,
J15, K3, K7, K8, K9, K10,
K14, L13, L15, M3, M4,
M14, N3, N4, N5, N6, N7,
N8, N9, N10, N11, N12,
N15, P1, P2, P5, P6, P7,
P8, P9, P10, R3, R5, R8,
R11, R15, T5, T8, T11,
T14
SLF7028T-100M1R1
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