參數(shù)資料
型號: LMK04033BISQ/NOPB
廠商: National Semiconductor
文件頁數(shù): 50/65頁
文件大小: 0K
描述: IC CLOCK CONDITIONER PREC 48LLP
標(biāo)準(zhǔn)包裝: 1,000
系列: PowerWise®
類型: 時鐘調(diào)節(jié)器
PLL:
輸入: LVCMOS
輸出: LVCMOS,LVDS,2VPECL,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 2:6
差分 - 輸入:輸出: 是/是
頻率 - 最大: 2.16GHz
除法器/乘法器: 是/是
電源電壓: 3.15 V ~ 3.45 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 48-LLP(7x7)
包裝: 帶卷 (TR)
其它名稱: LMK04033BISQ
CLKoutX
CLKoutX*
1
2
0
:
1
2
0
:
0.1 PF
50: Trace
5
0
:
Load
5
0
:
LVPECL
Driver
CLKoutX
CLKoutX*
:
50: Trace
1
2
0:
Load
Vcc
8
2:
1
2
0:
Vcc
LVPECL
Driver
8
2
CLKoutX
CLKoutX*
50:
50: Trace
5
0:
Load
Vcc - 2V
LVPECL
Driver
SNOSAZ8J – SEPTEMBER 2008 – REVISED SEPTEMBER 2011
Termination for Single-Ended Operation
A balun can be used with either LVDS or LVPECL drivers to convert the balanced, differential signal into an
unbalanced, single-ended signal.
It is possible to use an LVPECL driver as one or two separate 800 mVpp signals. When using only one LVPECL
driver of a CLKoutX/CLKoutX* pair, be sure to properly terminated the unused driver. When DC coupling one of
the LMK04000 family clock LVPECL drivers, the termination should be 50
Ω to VCC - 2 V as shown in Figure 24.
The Thevenin equivalent circuit is also a valid termination as shown in Figure 25 for Vcc = 3.3 V.
Figure 24. Single-Ended LVPECL Operation, DC Coupling
Figure 25. Single-Ended LVPECL Operation, DC Coupling, Thevenin Equivalent
When AC coupling an LVPECL driver use a 120
Ω emitter resistor to provide a DC path to ground and ensure a
50
Ω termination with the proper DC bias level for the receiver. The typical DC bias voltage for LVPECL
receivers is 2 V (See Driving CLKin Pins with a Single-Ended Source). If the companion driver is not used it
should be terminated with either a proper AC or DC termination. This latter example of AC coupling a single-
ended LVPECL signal can be used to measure single-ended LVPECL performance using a spectrum analyzer or
phase noise analyzer. When using most RF test equipment no DC bias point (0 VDC) is required for safe and
proper operation. The internal 50
Ω termination of the test equipment correctly terminates the LVPECL driver
being measured as shown in Figure 26.
Figure 26. Single-Ended LVPECL Operation, AC Coupling
54
Copyright 2008–2011, Texas Instruments Incorporated
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