參數(shù)資料
型號(hào): CDCLVP2104RHDR
廠商: Texas Instruments
文件頁(yè)數(shù): 4/22頁(yè)
文件大?。?/td> 0K
描述: IC CLOCK BUFFER 2:8 2GHZ 28-VQFN
標(biāo)準(zhǔn)包裝: 3,000
類(lèi)型: 扇出緩沖器(分配)
電路數(shù): 2
比率 - 輸入:輸出: 2:8
差分 - 輸入:輸出: 是/是
輸入: LVCMOS,LVDS,LVPECL,LVTTL
輸出: LVPECL
頻率 - 最大: 2GHz
電源電壓: 2.375 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 28-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 28-VQFN-EP(5x5)
包裝: 帶卷 (TR)
Board
Supply
Chip
Supply
C
10 F
m
C
1 F
m
C
0.1 F(x6)
m
FerriteBead
V
CC
(a) Output DC Termination
(b) Output AC Termination
CDCLVP2104
LVPECL
86 W
50 W
V
BB
CDCLVP2104
LVPECL
250 W
62.5 W
250 W
62.5 W
V
CC
V
CC
SCAS889A
– OCTOBER 2009 – REVISED AUGUST 2011
Figure 13 illustrates this recommended power-supply decoupling method.
Figure 13. Power-Supply Decoupling
LVPECL Output Termination
The CDCLVP2104 is an open emitter for LVPECL outputs. Therefore, proper biasing and termination are
required to ensure correct operation of the device and to minimize signal integrity. The proper termination for
LVPECL outputs is a 50
to (VCC –2) V, but this dc voltage is not readily available on PCB. Therefore, a
Thevenin equivalent circuit is worked out for the LVPECL termination in both direct-coupled (dc) and ac-coupled
configurations. These configurations are shown in Figure 14a and b for VCC = 2.5 V and Figure 15a and b for VCC
= 3.3 V, respectively. It is recommended to place all resistive components close to either the driver end or the
receiver end. If the supply voltage for the driver and receiver is different, ac coupling is required.
Figure 14. LVPECL Output DC and AC Termination for VCC = 2.5 V
12
Copyright
2009–2011, Texas Instruments Incorporated
Product Folder Link(s): CDCLVP2104
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