Device Overview

General Description

The MDPX-00009CSP3 is a MMIC surface mount balanced diplexer featuring a 7.4 GHz crossover frequency and high 30 dB isolation between the lowpass and highpass ports. The reflectionless architecture provides excellent return losses both in-band and out-of-band for the lowpass and highpass ports. Passive GaAs MMIC technology allows production of smaller filter constructions that replace larger form factor circuit board constructions. Tight fabrication tolerances allow for less unit-to-unit variation than traditional filter technologies. The MDPX-00009CSP3 is available as a 3.5x3.5mm CSP3. Low unit to unit variation allows for accurate simulations using the provided S3P file taken from measured production units.

Photo of MDPX-00009CSP3

Features

  • Low Insertion Loss, ≤ 0.7 dB Typical
  • Crossover Point, 7.4 GHz
  • Return Losses, 25 dB Typical
  • Highpass-Lowpass Isolation, 30 dB Typical
  • Reflectionless Diplexer
  • Excellent In-Band and Out-of-Band Return Losses

Applications

N/A

Functional Block Diagram

Block Diagram

Part Ordering Options

Part NumberDescriptionPackageGreen StatusProduct LifecycleExport Classification
MDPX-00009CSP3Passive MMIC 7.4GHz Reflectionless DiplexerCSP3

RoHS

REACH

ReleasedEAR99
EVB-MDPX-00009Evaluation Board, Passive MMIC 7.4GHz Reflectionless DiplexerEVB

RoHS

REACH

ReleasedEAR99

Table Of Contents

Revision History

Revision CodeRevision DateComment
-2025-10-21Initial Release

Rev: - | Copyright © 2025 Marki Microwave LLC.

2

Port Configuration and Functions

Port Functions

PortFunctionDescriptionDC Equivalent
Circuit
Pin 1Common/Input Pin 1 is DC short to Pin 3 and open to GND and Pin 5.Equivalent circuit for the Common/Input
Pin 3RF Low Band Pin 3 is DC short to Pin 1 and open to GND and Pin 5Equivalent circuit for the RF Low Band
Pin 5RF High Band Pin 5 is DC open to Pin 1, Pin 3, and GNDEquivalent circuit for the RF High Band

Rev: - | Copyright © 2025 Marki Microwave LLC.

3

Specifications

Absolute Maximum Ratings

ParameterMaximum RatingUnit
Maximum Operating Temperature 100°C
Maximum Storage Temperature 125°C
Minimum Operating Temperature -55°C
Minimum Storage Temperature -65°C
DC Current 24mA

Package Information

ParameterDetailsRating
ESD< 250 VoltsHBM Class 0
Dimensions-3.50 x 3.50 mm
Moisture Sensitivity Level-MSL 1

Rev: - | Copyright © 2025 Marki Microwave LLC.

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Electrical Specifications

ParameterTest ConditionsMinimum
Frequency
(GHz)
Maximum
Frequency
(GHz)
MinTypMaxUnit
High Pass Center Freq Temp = 25°C
- --22.93-GHz
1 dBc High Passband Temp = 25°C
10.89 ----GHz
3 dBc High Passband Temp = 25°C
7.23 ----GHz
30 dBc High Pass Rejection Point Temp = 25°C
0.27 0.27---GHz
High Pass Filter, Pass Band Insertion Loss Temp = 25°C
- --0.7-dB
High Pass Filter, Pass Band Return Loss Temp = 25°C
- --18-dB
High Pass Isolation Temp = 25°C
- --30-dB
High Pass Group Delay Temp = 25°C
- --54-ps
Low Pass Center Freq Temp = 25°C
- --1.92-GHz
1 dBc Low Passband Temp = 25°C
- 3.82---GHz
3 dBc Low Passband Temp = 25°C
- 7.09---GHz
30 dBc Low Pass Rejection Point Temp = 25°C
19.83 19.83---GHz
Low Pass Filter, Pass Band Insertion Loss Temp = 25°C
- --0.5-dB
Low Pass Filter, Pass Band Return Loss Temp = 25°C
- --33-dB
Low Pass Isolation Temp = 25°C
- --29-dB
Crossover Isolation Temp = 25°C
- --27-dB
Cross Over Frequency Temp = 25°C
- --7.45-GHz
Common Port Return Loss Temp = 25°C
- --25-dB
Impedance Temp = 25°C
- --50-Ω
High Pass Group Delay Configuration A, Temp = 25°C
- --54-ps
Low Pass Group Delay Temp = 25°C
- --61-ps

Rev: - | Copyright © 2025 Marki Microwave LLC.

5

Typical Performance Plot

Insertion Loss (dB) graph for MDPX-00009CSP3
Insertion Loss (dB) graph for MDPX-00009CSP3
Highpass-Lowpass Isolation (dB) graph for MDPX-00009CSP3
Insertion Loss (dB) graph for MDPX-00009CSP3
Return Loss (dB) graph for MDPX-00009CSP3
Common Port Return Loss (dB) graph for MDPX-00009CSP3
Low Pass Group Delay (ps) graph for MDPX-00009CSP3
High Pass Group Delay (ps) graph for MDPX-00009CSP3

All measurements are de-embedded from the fixture with Automatic Fixture Removal (AFR).

Rev: - | Copyright © 2025 Marki Microwave LLC.

6

Mechanical Data

Outline Drawing

Download : Outline 2D Drawing

Outline Drawing

Rev: - | Copyright © 2025 Marki Microwave LLC.

7

Footprint Image

Footprint of the package for MDPX-00009CSP3

Rev: - | Copyright © 2025 Marki Microwave LLC.

8

Evaluation Board - Outline Drawing

Outline Drawing

Rev: - | Copyright © 2025 Marki Microwave LLC.

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