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ZL40226LDG1
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P22
VDD_dr
i
ver
VDD_dr
i
ver
VDD
ZL40226
cl
k_p
cl
k_n
CM
O
S
Dr
iv
er
R
R
C
Vre
f = VDD_dri
ver
/2
R= 10 K ohm
s,
C = 100 nF
Figure 10 - CMOS Input DC Coupled Referenced to VDD/2
VDD
VDD_driver
VDD
ZL40226
clk_p
clk_n
CMOS
Driver
R2
C
RA
R3
R1
Figure 1
1 - CMOS Input DC Coupled Referenced to Grou
nd
T
able 2 - 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
ZL40226
Data Sheet
10
Microsemi Corporation
* For frequencies below 100 MHz, incr
ease
C to avoid signal integrity issues.
ZL40226
Data Sheet
11
Microsemi Corporation
3.3 Clock Output
s
L
VDS has lower signal swing
than L
VPECL which results in
a low power consum
ption. A simplified diagram for the
L
VDS output sta
ge is shown in
Figure 12
.
VDD
3 mA
Output
-
+
+
-
Figure 12 - Simplified L
VDS Output Dr
iver
The methods to terminate the
ZL40226
drivers are shown in the follo
wing figures.
LVD
S
Rec
eive
r
VDD
Z
o
= 50 Ohm
s
Z
o
= 50 Ohm
s
ZL40226
clk_p
clk_n
VDD_Rx
Figure 13 - L
VDS DC Coupled T
ermination (Interna
l Receiver T
ermination)
LVDS
Receiver
VDD
VDD_Rx
Z
o
= 50 Ohms
Z
o
= 50 Ohms
ZL40226
clk_p
clk_n
100 Ohms
Figure 14 - L
VDS DC Coupled T
ermina
tion (External Receiv
er T
ermination)
LVDS
Receiver
VDD
VDD_Rx
Z
o
= 50 Ohms
Z
o
= 50 Ohms
ZL40226
clk_p
clk_n
100 Ohms
R2
VDD_Rx
R1
R1
R2
Note: R1 and R2 values and need for external termination
depend on the
specification
of the LVDS receiver
Figure 15 - L
VDS AC Coupled T
ermination
ZL40226
Data Sheet
12
Microsemi Corporation
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P22
ZL40226LDG1
Mfr. #:
Buy ZL40226LDG1
Manufacturer:
Microchip / Microsemi
Description:
Clock Buffer 2:8 LVDS Fanout Buffer w/Ext. Term.
Lifecycle:
New from this manufacturer.
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