參數(shù)資料
型號(hào): ICS813078BYILFT
廠商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 11/26頁(yè)
文件大小: 0K
描述: IC VCXO PLL WIRELESS 64TQFP
標(biāo)準(zhǔn)包裝: 500
系列: HiPerClockS™, FemtoClock™
類型: 時(shí)鐘/頻率發(fā)生器,扇出緩沖器(分配),抖動(dòng)衰減器,多路復(fù)用器
PLL:
主要目的: 無(wú)線基礎(chǔ)架構(gòu)應(yīng)用
輸入: LVDS,LVHSTL,LVPECL,晶體
輸出: LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 3:9
差分 - 輸入:輸出: 是/是
頻率 - 最大: 614.4MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝: 64-TQFP-EP(10x10)
包裝: 帶卷 (TR)
ICS813078I
FEMTOCLOCKS VCXO-PLL FREQUENCY GENERATOR
FEMTOCLOCKS VCXO-PLL FREQUENCY GENERATOR
19
ICS813078BYI REV. A OCTOBER 6, 2008
Recommendations for Unused Input and Output Pins
Inputs:
CLK/nCLK Inputs
For applications not requiring the use of the differential input, both
CLK and nCLK can be left floating. Though not required, but for
additional protection, a 1k
resistor can be tied from CLK to
ground.
CLK Input
For applications not requiring the use of a clock input, it can be left
floating. Though not required, but for additional protection, a 1k
resistor can be tied from the CLK input to ground.
LVCMOS Control Pins
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1k
resistor can be used.
Outputs:
LVPECL Outputs
All unused LVPECL outputs can be left floating. We recommend
that there is no trace attached. Both sides of the differential output
pair should either be left floating or terminated.
LVCMOS Outputs
All unused LVCMOS output can be left floating. There should be no
trace attached.
Termination for 3.3V LVPECL Outputs
The clock layout topology shown below is a typical termination for
LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, terminating
resistors (DC current path to ground) or current sources must be
used for functionality. These outputs are designed to drive 50W
transmission lines. Matched impedance techniques should be
used to maximize operating frequency and minimize signal
distortion. Figures 5A and 5B show two different layouts which are
recommended only as guidelines. Other suitable clock layouts may
exist and it would be recommended that the board designers
simulate to guarantee compatibility across all printed circuit and
clock component process variations.
Figure 5A. 3.3V LVPECL Output Termination
Figure 5B. 3.3V LVPECL Output Termination
V
CC - 2V
50
50
RTT
Z
o = 50
Z
o = 50
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
125
84
84
Z
o = 50
Z
o = 50
FOUT
FIN
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參數(shù)描述
ICS813078I 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCKS? VCXO-PLL FREQUENCY GENERATOR FOR WIRELESS INFRASTRUCTURE EQUIPMENT
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ICS813252I-02 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:VCXO JITTER ATTENUATOR & FEMTOCLOCK? MULTIPLIER
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