Diodes Incorporated ZXFV4583N16TA

Overview

ZXFV4583N16TA from Zetex (now Diodes Incorporated) is a video sync separator IC designed for PAL/NTSC/SECAM composite video systems. It extracts composite, horizontal, vertical, back porch, and odd/even sync signals using three external resistors to configure filter bandwidth, no-signal detection threshold, and timing intervals. Key confirmed parameters: +5V single supply, 4.5mA typical supply current, 1.35V clamp voltage at FILTIN/FVIDIN, 40–60% slice level, and 250–400ns CSYNC propagation delay. Used in CCTV surveillance front-ends for accurate black-level clamping.

For engineers reviewing the ZXFV4583N16TA datasheet, ZXFV4583N16TA pinout, ZXFV4583N16TA application, or ZXFV4583N16TA equivalent, this page delivers verified functional identity, resistor-programmable timing/filtering behavior, sync output timing relationships (e.g., tBKPCH = 2.7–4.7µs), DC restoration support via BKPCH, and validated SO16N package compatibility with EL4583 - all critical for analog video signal integrity design.

Technical Context

The ZXFV4583N16TA implements mixed-signal sync separation using an internal color carrier low-pass filter (bandwidth set by RFILT at Pin 1), adaptive clamping at FILTIN (Pin 4) and FVIDIN (Pin 8), and sample-and-hold-based 50% threshold slicing. Its timing outputs (HSYNC, VSYNC, BKPCH, ODDFLD) are all scaled synchronously by RSET (Pin 12), ensuring consistent inter-output timing across PAL and NTSC standards.

It integrates on-chip discharge/charge current sources for FILTIN and FVIDIN clamping (3–12µA no-signal discharge, 2–4mA clamp charge), a loss-of-signal detector with 600µs timeout (controlled by RNOSIG at Pin 2), and logic outputs with VOL ≤0.8V at 1.6mA. The device operates over –40°C to +85°C with 120°C/W thermal resistance in SO16N.

Key Specifications

Pinout & Package

Package: SO16N (JEDEC MS-012AC), 10.0 × 4.0 × 1.75 mm, surface-mount, lead-free compatible. Pin 14 is V+, Pin 6 is ground return for logic outputs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar video sync separation applications.

Compared with EL4583 and LM1881, the ZXFV4583N16TA uniquely combines resistor-programmable timing/filtering, BKPCH-driven DC restoration, and multi-standard field identification - making it the only option for designs requiring adaptive sync separation with black-level stability across PAL/NTSC/SECAM sources.

Availability

ZXFV4583N16TA is available at Aetrix Electronics and suitable for CCTV surveillance systems, digital image capture interfaces, and video distribution amplifiers requiring stable component supply, long-lifecycle support, and SO16N footprint compatibility.

Supply support for ZXFV4583N16TA 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 (acquired by Diodes Incorporated in 2008) specialized in high-performance analog and mixed-signal ICs for video, power management, and interface applications.

The ZXFV4583 belongs to Zetex's video signal conditioning product line, engineered specifically for robust sync separation in broadcast, security, and industrial video systems operating under variable signal integrity conditions.

FAQ

What is the purpose of the RSET resistor at Pin 12?

RSET sets the master timing reference for all internal time constants: sample/hold acquisition window, HSYNC pulse width (~5µs), BKPCH pulse width (2.7–4.7µs), and VSYNC default delay (30–45µs). A 681kΩ resistor achieves standard PAL/NTSC timing; scaling RSET linearly adjusts all intervals proportionally. Tolerance should be ≤1% to maintain timing accuracy across temperature.

Can ZXFV4583N16TA operate without the color carrier filter?

Yes. When the color carrier filter is not needed, leave Pin 4 (FILTIN) unconnected and route the composite video signal directly to Pin 8 (FVIDIN) via AC coupling. The internal clamp at FVIDIN remains active, and all sync outputs (CSYNC, HSYNC, VSYNC, etc.) function identically - only the RFILT resistor (Pin 1) becomes unused.

How does the NOSIG output behave during signal loss?

NOSIG goes high after a 600µs timeout when sync pulse amplitude at FVIDIN falls below the threshold set by RNOSIG (Pin 2). With RNOSIG = 82kΩ, the threshold is ~130mV at FILTIN or ~250mV at FVIDIN. The output remains asserted until valid sync pulses exceeding threshold are detected for >600µs, providing noise-immune loss-of-signal indication.

Is ZXFV4583N16TA compatible with 75Ω video systems?

Yes - the device accepts standard 75Ω composite video inputs at FILTIN or FVIDIN. For optimal performance, use AC coupling with a 100nF ceramic capacitor and terminate the source with 75Ω. Output logic signals (CSYNC, HSYNC, etc.) are CMOS-compatible and require proper PCB routing away from analog paths to prevent coupling, as specified in the layout guidelines.