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© 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.

Diplex Filters

Document 282-1

Document 282-1 Revised 01/11/08

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 Fconnector.

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.

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.

Low pass filter

High pass filter

Part

DOCSIS

Insertion

Return

Insertion

Return

number

standard

Passband

loss

loss

Passband

loss

loss

(mA)

DPX4254-B

1.0

5 – 42 MHz

≤1.0 dB

≥15 dB

54 – 860 MHz

≤1.5 dB

≥15 dB

500

DPX4254-C

1.0

5 – 42 MHz

≤1.5 dB

≥15 dB

54 – 860 MHz

≤1.5 dB

≥15 dB

150

DPX4288-B

1.1, 2.0

5 – 42 MHz

≤1.5 dB

≥10 dB

88 – 860 MHz

≤1.5 dB

≥10 dB

500

DPX4288-C

1.1, 2.0

5 – 42 MHz

≤1.5 dB

≥10 dB

88 – 860 MHz

≤1.5 dB

≥10 dB

150

Low pass (3)

High pass (2)

Ground (5)

F connector (1)

Ground (4)

Diplex filter

4

1

5

2

3

High pass

filter

Low pass

filter

F connector

Schematic – Shielded Filters (-B)

Impedance: 75 ohms all ports

Diplex

filter

2

4, 5

3

High pass

1

Low pass

Schematic – Surface Mount Filters (-C)

Impedance: 75 ohms all ports

For DOCSIS

1.0, 1.1, 2.0