ZXFV4089N8TA

Overview

The ZXFV4089N8TA is a DC restored video amplifier (black-level clamp) manufactured by Diodes Incorporated. It integrates a high-performance video amplifier with a nulling sample and hold amplifier to provide brightness level stability. The device operates on dual supplies of ±5V, typically ±5.25V maximum, within an ambient temperature range of -40°C to +85°C. Key electrical parameters include a 30 MHz ±0.1 dB bandwidth, a 210 MHz -3 dB bandwidth, and a slew rate of 400 V/µs. Differential gain is specified at 0.08% and differential phase at 0.1°. The input offset voltage is typically 10 mV, and the output drive current reaches 40 mA. It is housed in an 8-pin SOIC package.

Feature Summary

• Integrates a complete analog video DC level restoration system with a sample and hold amplifier for brightness stability.
• Utilizes a current feedback architecture that maintains fixed bandwidth over a wide range of gains.
• Features TTL/CMOS logic compatible HOLD input for precise timing control during back-porch intervals.
• Designed to drive back-terminated 75 ohm loads with optimized differential gain and phase errors.

Applications

• Black level clamping in cameras
• Image capture systems
• Video mixing equipment
• Display devices

Procurement Notes

Verify the specific ordering suffix N8TA corresponds to the 7-inch reel size containing 500 units per reel as documented in the manufacturer's ordering information. Confirm the component status and availability through authorized Diodes Incorporated distributors or regional sales offices, as product lifecycles may change without notice.

Selection Notes

Select this component when a compact solution for video black-level clamping is required. It eliminates the need for external discrete components by integrating the AC coupling capacitor function internally via the sample-hold mechanism. Ensure the application supports dual supply operation and requires high-speed performance with minimal differential gain and phase distortion.

Part Context

This device belongs to the ZXFV series of video amplifiers from Diodes Incorporated. It is pin and function compatible with the industry standard EL4089, facilitating direct replacement in existing designs. The part is designed for PAL, NTSC, and SECAM TV systems, offering a robust alternative for high-frequency signal processing where DC restoration is critical.

Replacement Considerations

The ZXFV4089N8TA is explicitly stated to be pin and function compatible with the industry standard EL4089. Designers replacing legacy EL4089 components should verify that the power supply requirements and layout constraints match the ZXFV4089 specifications.

FAQ

How does the ZXFV4089N8TA handle the AC coupling capacitor?

The input video signal is AC coupled to the main amplifier, and this same external capacitor acts as the holding capacitor for the sample and hold amplifier, reducing the total pin count and external component requirements.

What is the recommended HOLD input pulse duration for video applications?

For typical video applications, a negative-going sampling pulse of approximately 1.2 microseconds duration is applied during the central portion of the back porch interval to clamp the black level to the reference voltage.

Can the ZXFV4089N8TA drive a 75 ohm cable directly?

The device can drive a 75 ohm cable if a 75 ohm series terminating resistor is used at the output, although no output termination is strictly required for basic operation.