DPX4254-B_14 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 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        High pass filter
Part
number
DOCSIS
Insertion
standard Passband
loss
Return
Insertion
loss
Passband
loss
DPX4254-B
1.0
DPX4254-C
1.0
5 – 42 MHz
5 – 42 MHz
≤1.0 dB
≤1.5 dB
≥15 dB
≥15 dB
54 – 860 MHz
54 – 860 MHz
≤1.5 dB
≤1.5 dB
DPX4288-B
DPX4288-C
1.1, 2.0
1.1, 2.0
5 – 42 MHz
5 – 42 MHz
≤1.5 dB
≤1.5 dB
≥10 dB
≥10 dB
88 – 860 MHz
88 – 860 MHz
≤1.5 dB
≤1.5 dB
Return
loss
≥15 dB
≥15 dB
≥10 dB
≥10 dB
1. Current that causes a 15°C temperature rise from 25°C ambient.
2. Operating temperature range –40°C to +85°C.
3. Electrical specifications at 25°C.
  _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)
Impedance:  75 ohms all ports
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Document 282-1  Revised 01/11/08
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.