Texas Instruments LMK04828 User Manual

0.1 PF
0.1 PF
LMK048XX
Input
100:
100:Trace
(Differential)
Differential
Sinewave Clock
Source
CLKinX
CLKinX*
0.1 PF
0.1 PF
LMK048XX
Input
100:
100:Trace
(Differential)
CLKinX
CLKinX*
LVPECL
Ref Clk
240: 240:
0.1 PF
0.1 PF
0.1 PF
0.1 PF
LMK048XX
Input
100:
100:Trace
(Differential)
CLKinX
CLKinX*
LVDS
LMK04821 , LMK04826 , LMK04828
SNAS605AR –MARCH 2013–REVISED DECEMBER 2015 www.ti.com
10.2.2 Driving CLKin AND OSCin Inputs
10.2.2.1 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_BUF_TYPE = 0) when using differential reference clocks. The LMK0482x 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 20 and Figure 21.
Figure 20. CLKinX/X* Termination for an LVDS Reference Clock Source
Figure 21. CLKinX/X* Termination for an LVPECL Reference Clock Source
Finally, a reference clock source that produces a differential sine wave 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 Electrical
Characteristics.
Figure 22. CLKinX/X* Termination for a Differential Sinewave Reference Clock Source
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Texas Instruments LMK04828 Specifications

General

Brand	Texas Instruments
Model	LMK04828
Category	Motherboard
Language	English