Preliminary
28GHz Frequency Divider
FD28B
1. Application
Frequency divider for full-rate clock (20 ~ 28 GHz) of 20 ~ 28 Gb/s optical transmission system and
37
REFCLK (625 ~ 875 MHz) creation, etc
9
2
2. Block diagram
2
O32N
O16N
Vdd
G
G
14
28
O16N
U
FD28B
In
1/2
1/4
1/2
O32N
CNO32P
U
U
U
O2N11
1/2
In
3
2
O2P
O4N
7
O32P
FD28B
2
2
7
2
O2N
O2P
6.6
2
2
Vss
11.1
8
3
7
2
8
O4N
2.2φ- 4
Fig. 1 Module structure
3. Terminal description
No
Name
Function
Note
1
In
Signal Input
2
O2N
Divided by 2 signal output (negative)
(Internal AC Coupled)
SMPM/P
3
O2P
Divided by 2 signal output (positive)
(Internal AC Coupled)
SMPM/P
4
O4N
Divided by 4 signal output (negative)
(Internal AC Coupled)
SMPM/P
5
O16N
Divided by 16 signal output (negative)
(Internal AC Coupled)
SMPM/P
6
O32N
Divided by 32 signal output (negative)
(Internal AC Coupled)
SMPM/P
7
O32P
Divided by 32 signal output (positive)
(Internal AC Coupled)
SMPM/P
8
Vss
Supply voltage of first stage divider (-3.3 V)
Pin header
9
Vdd
Supply Voltage for amplifier (5V)
Pin header
10
G
Ground
Pin header
(Internal AC Coupled)
SMPM/P
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FD28B_DS Rev.0.3 120131
Preliminary
4. Absolute maximum ratings
Terminal
Parameter
Symbol
Unit
Min
Max
Vss
Supply voltage of first stage divider
Vss
V
-3.7
0.5
Vdd
Supply Voltage for amplifier
Vdd
V
5.5
In
Applied input power
Pin
Vpp
1.0 (+4 dBm)
ESD tolerance (HBM)
Vesd
V
-TBD
+TBD
Storage temperature
Tst
Degree C
-40
80
5. Characteristics (Ta=25 [℃])
Related
Parameter
Symbol
Unit
terminal
Min
In
Input frequency
GHz
2< fin <6 GHz
PminL
dBm
-7 (0.28Vpp)
fin > 6GHz
PminH
dBm
-20 (0.062Vpp)
Pmax
dBm
+ 3 (0.89Vpp)
RLin
dB
> 9
Divided by 2 output frequency
fout2
GHz
Output power (single ended)
PO2
dBm
-9 (0.23Vpp)
Rise/fall time (20-80 %)
tr/tf2
ps
12/14 ps
Divided by 4 output frequency
fout4
GHz
Output power (single ended)
PO4
dBm
-7 (0.28Vpp)
Rise/fall time (20-80 %)
tr/tf4
ps
17/16 ps
Divided by 16output frequency
fout16
GHz
Output power (single ended)
PO16
dBm
-4 (0.4Vpp)
Rise/fall time (20-80 %)
tr/tf16
ps
100 ps
Divided by 32 output frequency
fout32
GHz
Output power (single ended)
PO32
dBm
+3.1 (0.9Vpp)
Rise/fall time (20-80 %)
tr/tf32
ps
100 ps
Supply voltage of first stage divider
Vss
V
Supply current of Vss
Iss
mA
Supply voltage of dividers except first divider
Vdd
V
Supply Current of Vdd
Idd
mA
340
Power dissipation
Pdiss
W
2.4
Maximum Input power
Input return loss
O2N, O2P
O4N
O16N
O32N,O32P
Vdd
Vss,Vdd
Typ
fin
Minimum Input power
Vss
Specification
fout < 20 GHz
3.2
28
1.6
14
0.8
7
0.2
1.75
0.1
-3.5
Max
0.875
-3.3
-3.1
210
4.75
5
5.25
6. Precaution
This product uses ESD sensitive high-speed devices. Handle it with appropriate precaution described below.
1)
Connect the ground (G) terminal of FD28B to the highest quality ground line in the room and connect this
terminal to the ground terminal of test equipment as well.
2)
Use ESD protection wrist strap which is connected to FD28B ground.
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FD28B_DS Rev.0.3 120131
Preliminary
3)
Avoid abnormal mechanical shock.
7. Attachment
1) 30 cm Jumper cable with pin header socket: 1
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FD28B_DS Rev.0.3 120131