Diodes Incorporated ZXFV4089N8TA

Overview

ZXFV4089N8TA from Diodes Incorporated is a DC-restored video amplifier (black-level clamp) in an 8-pin SOIC package, integrating a current-feedback video amplifier and a nulling sample-and-hold circuit for brightness-level stabilization. It delivers 0.08% differential gain, 0.1° differential phase, and 30 MHz ±0.1 dB bandwidth while driving 75 Ω back-terminated loads - optimized for PAL/NTSC/SECAM analog video systems including broadcast cameras and professional video mixers.

For engineers reviewing the ZXFV4089N8TA datasheet, ZXFV4089N8TA pinout, ZXFV4089N8TA application, or ZXFV4089N8TA equivalent, key selection criteria include DC restoration accuracy during back-porch clamping, TTL/CMOS-compatible HOLD timing control, ±5 V dual-supply operation, -40°C to +85°C industrial temperature range, and pin compatibility with EL4089 for drop-in replacement in legacy video signal chains.

Technical Context

The ZXFV4089N8TA implements a two-stage analog restoration architecture: a high-speed current-feedback amplifier (210 MHz -3 dB bandwidth, 400 V/µs slew rate) paired with a dedicated sample-and-hold loop that forces the input DC level to VREF during the back-porch interval. The AC-coupling capacitor serves dual roles - signal coupling and hold capacitance - eliminating external storage capacitors.

Its HOLD input controls a TTL/CMOS-compatible switch that closes during sampling (logic LOW), enabling closed-loop DC correction, then opens (logic HIGH) to maintain restored level with <6.2 mV line-scan droop (at 0.01 µF coupling cap). The restore section achieves 54–90 dB CMRR and 0.3–7 mV composite offset, referenced to VREF (±2 V range).

Key Specifications

Pinout & Package

Package: 8-pin SOIC (SO-8), body width 3.9 mm, lead pitch 1.27 mm, JEDEC MS-012AC compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar video DC restoration applications.

Compared with EL4089CSZ and LMH6732MF/NOPB, ZXFV4089N8TA reduces total solution size by 35%, eliminates 6–8 external components, and guarantees sub-0.1° differential phase - making it optimal for space-constrained, high-reliability analog video systems where black-level stability is non-negotiable.

Availability

ZXFV4089N8TA is available at Aetrix Electronics and suitable for professional broadcast camera modules, medical endoscopy imaging subsystems, and studio video mixer input stages requiring stable component supply with guaranteed long-term continuity.

Supply support for ZXFV4089N8TA 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

Diodes Incorporated is a global manufacturer of high-performance discrete semiconductors and analog ICs, ISO 9001 and IATF 16949 certified, with design centers in US, Germany, Taiwan, and China.

ZXFV4089N8TA belongs to Diodes' Zetex analog video product line, engineered specifically for DC-coupled signal integrity in broadcast, medical, and industrial video systems where baseline stability and color fidelity are mission-critical.

FAQ

What is the maximum recommended peak voltage at IN+ (pin 2) to ensure DC restoration accuracy?

The voltage at pin 2 must not exceed +2.7 V peak under any condition. Exceeding this threshold increases sample-hold switch leakage, raising DC droop rate and degrading black-level accuracy. For 0.7 V white-level video signals, this limits VREF to ≤ +2.0 V to maintain margin - a constraint explicitly defined in the datasheet's "Common-mode input range" section.

How does the ZXFV4089N8TA achieve DC restoration without an external hold capacitor?

It uses the input AC-coupling capacitor (e.g., 0.01 µF) as the sample-hold storage element. During the HOLD = LOW interval, the internal switch connects this capacitor into a feedback loop with the sense amplifier and main amplifier, forcing the DC level at pin 2 toward VREF. When HOLD returns HIGH, the switch opens and the capacitor retains the corrected voltage - eliminating need for a separate hold capacitor.

Can the ZXFV4089N8TA clamp the sync tip instead of the back porch?

Yes - by retiming the HOLD pulse to coincide with the sync tip interval instead of the back porch, the device can clamp the sync tip to VREF. This requires external sync separation (e.g., ZXFV4583) configured for sync-tip detection and precise pulse width control (~1.2 µs), as described in the evaluation circuit notes.

What layout practices are mandatory to maintain 210 MHz bandwidth and low differential phase error?

A continuous ground plane with low-inductance vias, 0.1 µF ceramic decoupling caps placed <2 mm from pins 6 and 8, and minimized trace length/routing near pin 1 (IN−) are mandatory. Stray capacitance at pin 1 degrades pulse response; a ground plane cutout around this pin is recommended per the datasheet to preserve 0.1° differential phase performance.