参数资料
型号: LMK04031BEVAL/NOPB
厂商: National Semiconductor
文件页数: 51/65页
文件大小: 0K
描述: EVAL BOARD LMK04031BISQ
标准包装: 1
系列: PowerWise®
主要目的: 计时,多用途
嵌入式:
已用 IC / 零件: LMK04031
已供物品: 板,线缆,文档,软件
0.1 PF
LMK040XX
Input
1
0
:
100: Trace
(Differential)
Differential
Sinewave Clock
Source
CLKinX
CLKinX*
SNOSAZ8J – SEPTEMBER 2008 – REVISED SEPTEMBER 2011
DRIVING CLKin AND OSCin INPUTS
Driving CLKin Pins with a Differential Source
Both CLKin ports can be driven by differential signals. It is recommended that the input mode be set to bipolar
(CLKinX_TYPE = 0) when using differential reference clocks. The LMK04000 family internally biases the input
pins so the differential interface should be AC coupled. The recommended circuits for driving the CLKin pins with
either LVDS or LVPECL are shown in Figure 27 and Figure 28.
Figure 27. CLKinX/X* Termination for an LVDS Reference Clock Source
Figure 28. CLKinX/X* Termination for an LVPECL Reference Clock Source
Finally, a reference clock source that produces a differential sinewave output can drive the CLKin pins using the
following circuit. Note: the signal level must conform to the requirements for the CLKin pins listed in the Electrical
Figure 29. CLKinX/X* Termination for a Differential Sinewave Reference Clock Source
Driving CLKin Pins with a Single-Ended Source
The CLKin pins of the LMK04000 family can be driven using a single-ended reference clock source, for example,
either a sinewave source or an LVCMOS/LVTTL source. Either AC coupling or DC coupling may be used. In the
case of the sinewave source that is expecting a 50
Ω load, it is recommended that AC coupling be used as
shown in the circuit below with a 50
Ω termination..
NOTE
The signal level must conform to the requirements for the CLKin pins listed in the
Electrical Characteristics table. CLKinX_TYPE in Register 11 is recommended to be set to
bipolar mode (CLKinX_TYPE = 0).
Copyright 2008–2011, Texas Instruments Incorporated
55
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