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National Instruments · PXI

PXI-2557

The NI PXI-2557 is a 2.5 GHz, 75 Ω RF switch module with an 8×1 multiplexer topology.

ManufacturerNational Instruments

ModelPXI-2557

Part Number778572-57

Product TypeRF multiplexer switch module

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Topology8×1 multiplexer

Bandwidth2.5 GHz

Impedance75 Ω nominal

Connections9 mini-75 Ω SMB jacks

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Overview

Product overview

Key product information and technical features.

The PXI-2557 provides eight selectable RF paths to a common connection. NI identifies it as a 75 Ω multiplexer with 2.5 GHz bandwidth.

Latching electromechanical relays.
Single-slot 3U construction.
PXI trigger lines 0–7 for input and output.

Verified specifications

Technical data

Verified product specifications.

Maximum switching voltage	30 V
Maximum switching current per channel	0.5 A
Maximum carry current per channel	0.5 A
Maximum RF power	10 W
Insertion loss at ≤2.5 GHz	<2.15; typical 41 dB
Maximum relay operate time	10.4 ms
Operating temperature	0 to 55 °C

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National Instruments

Manufacturer

PXI

Modular instrumentation platform

PXI-2557

RF multiplexing

NI advises against switching active RF signals; channel-to-common switching power must not exceed 10 W.

Manuals & software

Technical resources

Manuals, software and technical resources for this model.

PXI-2557 SpecificationsSpecifications · ni.com

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NI PXI-2557 Hardware DiagramHardware Diagram · ni.com

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Understanding Key RF Switch SpecificationsTechnical resource

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FAQ

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Product-specific answers based on available technical information.

Is the PXI-2557 a 50 Ω switch?

No. NI specifies 75 Ω characteristic impedance.

Where can I find the routing diagram?

NI provides a dedicated PXI-2557 hardware diagram in the NI-SWITCH User Manual.