XD1881 Video Sync Separator

Product Overview

The XINLUDA XD1881 is a video sync separator designed to extract synchronization signals from composite video signals. It is a functional equivalent to Texas Instruments’ LM1881N, widely used in video processing systems for recovering sync signals such as composite sync, vertical sync, and field information.

Advantage: The XD1881 offers full feature compatibility with the LM1881N, making it a drop-in alternative for designs requiring composite sync separation.

Functionality and Signal Extraction

Both XD1881 and LM1881N are capable of separating:

• Composite sync (CSYNC)

• Vertical sync (VSYNC)

• Odd/even field (field identification)

These functions support precise synchronization in CCTV, video decoders, and other analog video systems.

Advantage: The XD1881 matches the signal decoding capabilities of the LM1881N, while delivering consistent signal integrity and reliable output timing for downstream video circuitry.

Electrical Performance and Timing Characteristics

Key performance metrics for both devices include:

• Operating Voltage: 5V typical

• Low power consumption: <10 mA

• Input signal compatibility: Standard NTSC, PAL, SECAM video signals

• Output pulse widths: Match industry-standard timing for CSYNC and VSYNC

XD1881 offers tight timing control and low jitter outputs, comparable to LM1881N, ensuring compatibility with time-sensitive video processing ICs.

Advantage: Excellent timing precision and signal compatibility with various video standards, supporting stable synchronization across a range of system configurations.

Input Clamp and Video Signal Handling

Like the LM1881N, the XD1881 includes an internal clamp circuit for AC-coupled input video, eliminating the need for complex biasing networks. This ensures robust operation across various video source amplitudes and minimizes external component count.

Advantage: Simplified circuit design and robust signal tolerance enhance system stability and reduce BOM costs.

Pin Configuration and Drop-In Compatibility

The XD1881 is provided in the standard 8-pin DIP and SOIC-8 packages with pin-to-pin compatibility to the LM1881N. This ensures seamless drop-in replacement in both new and legacy designs without requiring PCB modifications.

Advantage: 100% pin compatibility for quick substitution and second-sourcing flexibility.

Temperature Range and Reliability

Both the XD1881 and LM1881N are specified for operation from –40°C to +85°C, ensuring stable functionality in industrial and commercial video applications.

XINLUDA performs stringent quality assurance and electrical testing to ensure batch consistency and reliability.

Advantage: Industrial-grade reliability with consistent batch performance and lower variation across units.

Supply Chain Stability and Cost Efficiency

One of the significant advantages of the XD1881 is its cost-effectiveness and stable availability compared to the LM1881N, which may face longer lead times due to global supply chain constraints.

XINLUDA ensures prompt delivery cycles and competitive pricing, especially critical for volume deployment in surveillance, automotive video, and analog capture systems.

Advantage: Lower procurement risk, reduced lead time, and improved cost-efficiency, particularly beneficial for high-volume production lines.

Conclusion

The XINLUDA XD1881 offers a reliable, cost-effective, and fully compatible alternative to the LM1881N, with the following advantages:

• Functionally identical sync separation capabilities

• Excellent timing and signal integrity

• Integrated input clamp circuit for simplified design

• Full pin compatibility with DIP-8 and SOIC-8 packages

• Industrial temperature range support

• Competitive pricing and improved supply assurance

The XD1881 is an ideal solution for analog video synchronization applications in cost-sensitive and time-critical production environments.