Single Channel Video Driver with Integrated Filter and Clamp# Technical Documentation: FMS6413 Triple Video Filter Driver
Manufacturer : FSC (Fairchild Semiconductor)
Component Type : Triple 6th-Order SD (Filter) and Cable Driver
Document Version : 1.0
Date : October 2023
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## 1. Application Scenarios
### 1.1 Typical Use Cases
The FMS6413 is a highly integrated triple video filter and driver designed for processing standard-definition (SD) video signals. Its primary use cases include:
- Video Reconstruction Filtering : The device incorporates three independent 6th-order Butterworth low-pass filters, typically set to 8 MHz cutoff frequencies. This effectively removes DAC sampling artifacts and high-frequency noise from composite video (CVBS), S-Video (Y/C), or component video (YPrPb) signals generated by digital video sources (e.g., DVD players, set-top boxes, graphics processors).
- Cable Driving and DC Level Shifting : Each channel includes a high-current output driver capable of driving doubly-terminated 75Ω coaxial cables (150Ω load). It provides the necessary DC offset to ensure the video signal meets standard voltage levels (e.g., 1Vpp for Y, 0.7Vpp for C/Pr/Pb on a 75Ω load, with appropriate DC biases).
- Video Distribution : A single FMS6413 can filter and drive three independent video channels, making it suitable for systems requiring multiple simultaneous video outputs, such as multi-format video interfaces or video distribution amplifiers.
### 1.2 Industry Applications
- Consumer Electronics : Found in DVD/Blu-ray players, digital set-top boxes, personal video recorders (PVRs), and legacy gaming consoles for generating analog video outputs from digital media.
- Professional Video & Broadcast : Used in video editing equipment, format converters, and broadcast infrastructure where clean analog video signals are required for monitoring or legacy distribution.
- Computer Graphics & Display Interfaces : Employed on graphics cards or embedded systems to provide VGA or composite/S-video outputs alongside primary digital outputs.
- Medical Imaging Displays : Used in systems where analog video signals from older imaging equipment must be conditioned and driven to modern displays.
### 1.3 Practical Advantages and Limitations
Advantages:
- High Integration : Combines three filters and three drivers in one 16-pin package (SOIC or TSSOP), reducing board space, component count, and design complexity compared to discrete solutions.
- Excellent Performance : The 6th-order filter provides >40dB attenuation at the Nyquist frequency (typically 27 MHz for SD video), ensuring clean output with minimal aliasing. The driver offers low differential gain/phase error (<0.5%/0.5°), preserving color fidelity.
- Flexible Power Supply : Operates from a single +5V supply, simplifying power system design.
- Robust Outputs : Short-circuit and thermal protection on output drivers enhance system reliability.
Limitations:
- Standard-Definition Only : The fixed 8 MHz filter cutoff is optimized for SD video (480i/576i). It is not suitable for high-definition (HD) analog signals (e.g., YPrPb component up to 1080p), which require much higher bandwidths (~30-100 MHz).
- Fixed Filter Characteristics : The filter response is factory-set and cannot be adjusted by the user. Applications requiring different cutoff frequencies or filter types (e.g., Chebyshev) need an alternative component.
- Power Dissipation : When driving all three channels into 150Ω loads simultaneously, the device can dissipate significant power, requiring attention to thermal management in high-ambient-temperature environments.
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## 2. Design Considerations
### 2.1 Common Design Pitfalls and Solutions
- Pitfall 1:
