Coilcraft DPX4288-C Diplex filter Datasheet

Document 282-1
Diplex Filters
For DOCSIS
1.0, 1.1, 2.0
These diplex filter modules provide both low pass and high
pass filtering in low cost units that meet the requirements
of the DOCSIS 1.0, 1.1 and 2.0 standards.They are intended for two-way broadcast applications like cable modems, set-top boxes and HFC cable network equipment.
The DPX-C parts are low-profile surface mount units
that require a minimum of board space. The DPX-B are
shielded and come with an integrated coaxial F connector.
In addition to the designs shown here, Coilcraft can
custom-engineer diplexers for specific applications. For
free evaluation samples, contact Coilcraft or order them
on-line at www.coilcraft.com.
Low pass filter
Insertion
Passband
loss
Part
number
DOCSIS
standard
DPX4254-B
DPX4254-C
1.0
1.0
5 – 42 MHz
5 – 42 MHz
DPX4288-B
DPX4288-C
1.1, 2.0
1.1, 2.0
5 – 42 MHz
5 – 42 MHz
Return
loss
High pass filter
Insertion
Passband
loss
≤1.0 dB
≤1.5 dB
≥15 dB
≥15 dB
54 – 860 MHz
54 – 860 MHz
≤1.5 dB
≤1.5 dB
≥10 dB
≥10 dB
88 – 860 MHz
88 – 860 MHz
Return
loss
Irms1
(mA)
≤1.5 dB
≤1.5 dB
≥15 dB
≥15 dB
500
150
≤1.5 dB
≤1.5 dB
≥10 dB
≥10 dB
500
150
1. Average current for a 15°C temperature rise above 25°C ambient.
2. Operating temperature range –40°C to +85°C.
3. Electrical specifications at 25°C.
Schematic – Shielded Filters (-B)
Diplex filter
Schematic – Surface Mount Filters (-C)
1
High pass
filter
2
4
1
F connector
F connector (1)
Low pass
filter
3
5
2
High pass
Diplex
filter
3
Low pass
4, 5
Impedance: 75 ohms all ports
Low pass (3)
Ground (5)
High pass (2)
Ground (4)
Impedance: 75 ohms all ports
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2007
Document 282-1
Revised 01/11/08
Document 282-2
Shielded Diplex Filter – DPX4254-B
High pass response
0
0
20
20
40
40
S21
S31
Low pass response
60
60
80
80
100
100
1
10
100
1000
1
Frequency (MHz)
100
1000
Frequency (MHz)
Return loss
Isolation
0
0
10
20
20
40
S32
S11
10
30
60
40
80
50
100
1
10
100
1000
1
Frequency (MHz)
10
100
1000
Frequency (MHz)
Unshielded Diplex Filter – DPX4254-C
High pass response
0
0
20
20
40
40
S21
S31
Low pass response
60
60
80
80
100
100
1
10
100
1000
1
Frequency (MHz)
100
1000
Frequency (MHz)
Return loss
Isolation
0
0
10
20
20
40
S32
S11
10
30
60
40
80
50
100
1
10
100
1000
1
Frequency (MHz)
100
1000
Frequency (MHz)
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2007
10
Document 282-2
Revised 01/11/08
Document 282-3
Shielded Diplex Filter – DPX4288-B
High pass response
0
0
20
20
40
40
S21
S31
Low pass response
60
60
80
80
100
100
1
10
100
1000
1
Frequency (MHz)
100
1000
Frequency (MHz)
Return loss
Isolation
0
0
10
20
20
40
S32
S11
10
30
60
40
80
50
100
1
10
100
1000
1
Frequency (MHz)
10
100
1000
Frequency (MHz)
Unshielded Diplex Filter – DPX4288-C
High pass response
0
0
20
20
40
40
S21
S31
Low pass response
60
60
80
80
100
100
1
10
100
1000
1
Frequency (MHz)
100
1000
Frequency (MHz)
Return loss
Isolation
0
0
10
20
20
40
S32
S11
10
30
60
40
80
50
100
1
10
100
1000
1
Frequency (MHz)
100
1000
Frequency (MHz)
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2007
10
Document 282-3
Revised 01/11/08
Document 282-4
Dimensions – DPX4254-B, DPX4288-B
Dimensions – DPX4254-C
A
A
C
B
D
E
B
F
F
G
G
I
3
1
2
5
K L
J
4
D
3/8 - 32 UNEF 2A
F connector
H
H
Recommended
Land Pattern
Packaged 32 per tray
C
A
B
C
D
max max max typ
E
F
G
H
I
J
K
L
1.065 0.560 0.215 0.155 0.050 0.300 0.400 0.700 0.120 0.070 0.305 0.545
17,05 14,22 5,46 3,94 1,27 7,62 10,16 17,78 3,05 1,78 7,75 13,84
F
E
H
G
I
J
J
K
Dimensions – DPX4288-C
L
A
B
D
C
M
E
J
J
G
N
F
F
H
0.8025 / 20,38
0.1425 / 3,62
0.2405 / 6,11
0.3695 / 9,39
0
0.043
1,1
3
1
5
0.039 × 0.157
(4)
1,0 × 4,0
0.196 / 4,98
0.274 / 6,96
0.039 × 0.130
(2)
1,0 × 3,3
0.452 / 11,48
0.550 / 13,97
J K
I
G
G
Recommended
Land Pattern
Packaged 32 per tray
A
B
C
max max max
1.065 0.560 0.215
17,05 14,22 5,46
D
typ
E
F
G
H
I
J
K
0.155 0.050 0.400 0.800 0.120 0.070 0.305 0.545
3,94 1,27 10,16 20,32 3,05 1,78 7,75 13,84
1.2745 / 32,37
0.2845 / 7,23
0.9935 / 25,24
1.0945 / 27,80
0.692 / 17,58
2
4
0
(4)
0
F
F
O
Recommended Board Layout
Packaged 25 per tray
A max B max
1.40
0.81
35,56 20,57
C max
0.51
12,95
D
0.580
14,73
E
0.124
3,15
F
0.005
1,27
G
0.035
0,89
I
0.855
21,72
K
0.229
5,82
L
0.378
9,60
M
0.091
2,31
N
0.311
7,90
O
0.753
19,13
J
0.118
3,00
H
1.303
33,10
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2007
Document 282-4
Revised 01/11/08
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