DPX4254-B Datasheet, PDF (1/4 Pages) Coilcraft lnc. – Diplex Filters

Document 282-1
Diplex Filters ForDOCSIS
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 in-
tended for two-way broadcast applications like cable mo-
dems, 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.
Part
number
DPX4254-B
DPX4254-C
DPX4288-B
DPX4288-C
DOCSIS
standard
1.0
1.0
1.1, 2.0
1.1, 2.0
Low pass filter
Insertion
Passband
loss
5 – 42 MHz
5 – 42 MHz
≤1.0 dB
≤1.5 dB
5 – 42 MHz
5 – 42 MHz
≤1.5 dB
≤1.5 dB
Return
loss
≥15 dB
≥15 dB
≥10 dB
≥10 dB
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.
High pass filter
Passband
Insertion
loss
54 – 860 MHz
54 – 860 MHz
≤1.5 dB
≤1.5 dB
88 – 860 MHz
88 – 860 MHz
≤1.5 dB
≤1.5 dB
Return
loss
≥15 dB
≥15 dB
≥10 dB
≥10 dB
Irms¹
(mA)
500
150
500
150
Schematic – Shielded Filters (-B)
Schematic – Surface Mount Filters (-C)
F connector (1)
Diplex filter High pass 2
filter
4
1
F connector Low pass
3
filter
5
1
2
High pass
Diplex
filter
3
Low pass
Low pass (3)
Ground (5)
4, 5
Impedance: 75 ohms all ports
High pass (2) Ground (4)
© Coilcraft, Inc. 2007
Impedance: 75 ohms all ports
Specifications subject to change without notice.
Please check our website for latest information. Document 282-1 Revised 01/11/08