ZL30416
Data Sheet
4.2.2 Interfacing to OC-CLKo Output
4.2.2.1 LVPECL to LVPECL Interface
The OC-CLKo outputs provide differential LVPECL clocks at 622.08 MHz, 155.52 MHz, 77.76 MHz, 38.88 MHz and
19.44 MHz selectable with FS3, FS2 and FS1 frequency select inputs. The LVPECL output drivers require a 50 Ω
termination connected to the Vcc-2V source for each output terminal at the terminating end as shown below. The
terminating resistors should be placed close to the LVPECL receiver.
Typical resistor values: R1 = 127 Ω, R2 =82.5 Ω
+3.3 V
0.1 uF
VCC=+3.3 V
R1
ZL30416
VCC
LVPECL
Receiver
R1
R2
Z=50 Ω
Z=50 Ω
LVPECL
Driver
OC-CLKoP
OC-CLKoN
R2
GND
Figure 8 - LVPECL to LVPECL Interface
10
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
