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ZL40200LDF1
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P25
VDD_driver
VDD_driver
VDD
ZL40200
clk_p
clk_n
CMOS
Driver
R
R
C
Vref = VDD_driver/2
R=10 k ohm, C = 100 nF
Figure 10 - CMOS Input DC Coupled Referenced to VDD/2
VDD
VDD_driver
VDD
ZL40200
clk_p
clk_n
CMOS
Driver
R2
C
RA
R3
R1
Figure 1
1 - CMOS Input DC Coupled Referenced to Grou
nd
T
able 1 - Component V
alues for Single Ended Input Reference to Grou
nd
VDD_driver
R1 (k
Ω
)
R2 (k
Ω
)
R3 (k
Ω
)
RA (k
Ω
)
C (pF)
1.5
1.25
3.075
open
10
10
1.8
1
3.8
open
10
10
2.5
0.33
4.2
open
10
10
3.3
0.75
open
4.2
10
10
ZL40200
Data Sheet
10
Microsemi Corporation
* For frequencies below 100 MHz, incr
ease
C to avoid signal integrity issues.
ZL40200
Data Sheet
11
Microsemi Corporation
3.2 Clock Output
s
L
VPECL has a very low output impedance and a dif
ferential signal swing between 1V and 1.6
V
. A simplified
diagram for the output stage is shown in Figure 12
.The L
VPECL to L
VDS output termination is not shown since
there is a separate device that has the same input and L
VDS outputs.
out_p
out_n
Figure 12 - Simplified Output Driver
The methods to terminate the ZL40200 L
VPECL dr
ivers are shown in the following figures.
LVP
E
CL
Rece
i
ver
50
Ohms
50
Ohms
VDD
VDD_
Rx
Z
o
= 50 Ohm
s
Z
o
= 50 Ohm
s
ZL40200
cl
k_p
cl
k_n
VDD -
2
Figure 13 - L
VPEC
L Basic Output T
ermination
LVP
E
CL
Rece
i
ver
50
Ohms
50
Ohms
VDD
VDD_
Rx
Z
o
= 50 Ohm
s
Z
o
= 50 Ohm
s
ZL40200
cl
k_p
cl
k_n
R
For
VDD
= 2.
5 V:
R = 20
O
hm
s
For
VDD
= 3.
3 V:
R = 50
O
hm
s
Figure 14
- L
VPECL Pa
rallel Outp
ut T
ermina
tion
ZL40200
Data Sheet
12
Microsemi Corporation
R2
R2
VDD
VDD_
Rx
Z
o
= 50 Ohm
s
Z
o
= 50 Ohm
s
ZL40200
cl
k_p
cl
k_n
For
VDD
= 2.
5 V:
R1 = 250 Ohm
s,
R2 = 62
.5
O
hm
s
For
VDD
= 3.
3 V:
R1 = 127 Ohm
s,
R2 = 82
O
hm
s
VDD
R1
R1
LVP
E
CL
Rece
i
ver
Figure 15 - L
VPECL Pa
ral
lel
The
ven
in-
Equ
iva
lent
Output T
ermination
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P25
ZL40200LDF1
Mfr. #:
Buy ZL40200LDF1
Manufacturer:
Microchip / Microsemi
Description:
Clock Buffer 1:2 LVPECL Fanout Buffer w/Ext. Term.
Lifecycle:
New from this manufacturer.
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