LMK04816_16 Datasheet, PDF (95/129 Pages) Texas Instruments – Three Input Low-Noise Clock Jitter Cleaner

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Application Information (continued)
LMK04816
SNAS597C – JULY 2012 – REVISED JANUARY 2016
NOTE
This Thevenin circuit is different from the DC-coupled example in Figure 30.
Vcc
CLKoutX
LVPECL
Driver
CLKoutX*
0.1 PF
0.1 PF
100-: Trace
(Differential)
LVPECL
Receiver
Vcc
Figure 33. Differential LVPECL Operation, AC Coupling, Thevenin Equivalent, External Biasing at the
Receiver
9.1.3.3 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 and CLKoutX* pair, be sure to properly terminated the unused driver. When DC coupling
one of the LMK04816 clock LVPECL drivers, the termination must be 50 Ω to V_CC – 2 V as shown in Figure 34.
The Thevenin equivalent circuit is also a valid termination as shown in Figure 35 for Vcc = 3.3 V.
Vcc - 2V
CLKoutX
LVPECL
Driver
Vcc - 2V
50-: Trace
Load
CLKoutX* _{50 :}
Figure 34. Single-Ended LVPECL Operation, DC Coupling
Vcc
CLKoutX
Vcc
LVPECL
Driver
CLKoutX*
50-: Trace
Load
Figure 35. Single-Ended LVPECL Operation, DC Coupling, Thevenin Equivalent
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