Diodes Incorporated ZXFV302EV

Overview

ZXFV302EV from Zetex Semiconductors is a dedicated evaluation board for the ZXFV302 4:1 analog video multiplexer IC, supporting laboratory validation of high-bandwidth (up to 300 MHz) composite video switching with 15.45 dB matched output attenuation, 50 Ω output impedance, and 150 Ω load termination. It enables functional verification of channel selection timing, gain flatness, and crosstalk performance in broadcast-grade video routing systems.

For engineers reviewing the ZXFV302EV datasheet, ZXFV302EV pinout, ZXFV302EV application, or ZXFV302EV equivalent, this board provides traceable RF layout practices-including continuous ground plane implementation, plated-through via placement, dual-stage power decoupling (1000 pF NPO + 0.1 µF X7R), and BNC-based 50 Ω test interface-critical for evaluating wideband video signal integrity.

Technical Context

The ZXFV302EV implements a double-sided PCB layout (2.5 × 2.25 inches) with strict RF grounding: a continuous ground plane under the ZXFV302N16 IC and all signal paths, supported by closely spaced plated-through vias for low-inductance return paths. Signal routing avoids splits or stubs, and all video traces are impedance-controlled.

Power delivery uses localized decoupling-1000 pF NPO ceramic capacitors placed adjacent to each supply pin, supplemented by 0.1 µF X7R ceramics-and remote bulk capacitance (1–10 µF solid tantalum or ceramic) near voltage regulators. The output matching network delivers precise 150 Ω load presentation and 50 Ω source termination simultaneously.

Key Specifications

Availability

ZXFV302EV is available at Aetrix Electronics and suitable for broadcast infrastructure design, professional video switcher development, and high-fidelity analog video signal path validation requiring stable component supply and proven RF layout reference.

Supply support for ZXFV302EV includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Zetex Semiconductors plc was a UK-based analog and mixed-signal semiconductor company specializing in high-performance discrete and interface ICs before its acquisition by Diodes Incorporated in 2008.

The ZXFV302EV belongs to Zetex's video interface evaluation platform series, developed specifically to demonstrate optimal PCB layout and signal integrity practices for wideband analog video multiplexing applications.

FAQ

Can the ZXFV302EV be used with the ZXFV301 multiplexer?

Yes. The ZXFV302EV is explicitly designed for both the ZXFV302 and ZXFV301 4:1 video multiplexers. Their AC performance is nearly identical; only active channel selection logic differs. No hardware modification is required to evaluate either device on this board.

What is the purpose of the 15.45 dB attenuation network on the output?

The 15.45 dB resistive matching network ensures the ZXFV302's 1× voltage gain stage drives a 150 Ω load (equivalent to back-terminated 75 Ω video line) while presenting a clean 50 Ω source impedance to test equipment-enabling accurate S-parameter and distortion measurements without external adapters.

Why does the board use both 1000 pF NPO and 0.1 µF X7R capacitors for decoupling?

The 1000 pF NPO capacitor provides ultra-low ESL/ESR RF bypassing directly at each supply pin, suppressing VHF/UHF noise. The adjacent 0.1 µF X7R handles mid-frequency transients. This two-tier approach targets overlapping impedance minima across 10 MHz–500 MHz, critical for preserving video edge fidelity.

Is a single-layer PCB sufficient for replicating this evaluation layout?

No. The ZXFV302EV requires a double-sided or multilayer PCB with a continuous ground plane beneath the IC and signal traces. Single-layer construction cannot achieve the low-inductance ground returns or controlled impedance routing needed to maintain 300 MHz bandwidth and minimize crosstalk.