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ZL40208LDG1

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27
ZL40208 Data Sheet
12
Microsemi Corporation
3.2 Clock Outputs
LVPECL has a very low output impedance and a differential signal swing between 1V and 1.6 V. A simplified
diagram for the output stage is shown in Figure 13.The LVPECL to LVDS output termination is not shown since
there is a separate device that has the same input and LVDS outputs.
Figure 13 - Simplified Output Driver
out_p
out_n
The methods to terminate the ZL40208 LVPECL drivers are shown in the following figures.
LVPECL
Receiver
50
Ohms
50
Ohms
VDD
VDD_Rx
Z
o
= 50 Ohms
Z
o
= 50 Ohms
ZL40208
clk_p
clk_n
VDD - 2
Figure 14 - LVPECL Basic Output Termination
LVPECL
Receiver
50
Ohms
50
Ohms
VDD
VDD_Rx
Z
o
= 50 Ohms
Z
o
= 50 Ohms
ZL40208
clk_p
clk_n
R
For VDD = 2.5 V: R = 20 Ohms
For VDD = 3.3 V: R = 50 Ohms
Figure 15 - LVPECL Parallel Output Termination
ZL40208 Data Sheet
13
Microsemi Corporation
R2 R2
VDD
VDD_Rx
Z
o
= 50 Ohms
Z
o
= 50 Ohms
ZL40208
clk_p
clk_n
For VDD = 2.5 V: R1 = 250 Ohms, R2 = 62.5 Ohms
For VDD = 3.3 V: R1 = 127 Ohms, R2 = 82 Ohms
VDD
R1 R1
LVPECL
Receiver
Figure 16 - LVPECL Parallel Thevenin-Equivalent Output Termination
VDD VDD_Rx
Z
o
= 50 Ohms
Z
o
= 50 Ohms
ZL40208
clk_p
clk_n
100 nF
100 nF
R
LVPECL
Receiver
50
Ohm
50
Ohm
R
VDD= 3.3V: R = 120 Ohm
VDD = 2.5 V: R = 60 Ohm
VDD= 3.3V: R2 = 50 Ohm
VDD = 2.5 V: R2 = 20 Ohm
R2
Figure 17 - LVPECL AC Output Termination for Externally Terminated LVPECL Inputs
ZL40208 Data Sheet
14
Microsemi Corporation
VDD VDD_Rx
Z
o
= 50 Ohms
Z
o
= 50 Ohms
ZL40208
clk_p
clk_n
100 nF
100 nF
R
LVPECL
Receiver
2K
Ohm
2K
Ohm
R
VDD= 3.3V: R = 120 Ohm
VDD = 2.5 V: R = 60 Ohm
2K
Ohm
2K
Ohm
Figure 18 - LVPECL AC Output Termination for Internally Terminated LVPECL Inputs
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27

ZL40208LDG1

Mfr. #:
Buy ZL40208LDG1
Manufacturer:
Microchip / Microsemi
Description:
Clock Buffer 2:6 LVPECL Fanout Buffer w/Ext. Term.
Lifecycle:
New from this manufacturer.
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