Triple Video Drivers w/Selectable HD/Progressive/SD/ Bypass Filters for RGB and YPbPr Signals# Technical Documentation: FMS6403MTC20X Video Filter Driver
Manufacturer : Fairchild Semiconductor (now part of ON Semiconductor)
Component Type : Integrated Video Filter Driver with 6th-Order Low-Pass Filter
Package : TSSOP-20 (MTC20X)
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## 1. Application Scenarios
### Typical Use Cases
The FMS6403MTC20X is a specialized video signal conditioning IC designed primarily for composite video (CVBS) and component video (YPbPr) applications in consumer electronics and professional video equipment. Its integrated architecture combines a 6th-order Butterworth low-pass filter with a high-performance video driver, making it ideal for:
- Digital-to-Analog Converter (DAC) Reconstruction Filtering : When used with video DACs (such as those found in DVD players, set-top boxes, or graphics processors), the device filters out high-frequency sampling artifacts above the Nyquist frequency while maintaining the essential video bandwidth (typically 0-6 MHz for standard definition video).
- Video Line Driving : The integrated driver provides sufficient current (typically 70 mA) to drive 75 Ω coaxial cables over distances up to 30 meters without significant signal degradation, eliminating the need for external buffer amplifiers.
- Signal Integrity Enhancement : By providing a well-defined band-limited response, the IC reduces high-frequency noise and minimizes inter-symbol interference in digital video systems.
### Industry Applications
- Consumer Electronics :
- DVD/Blu-ray players
- Digital set-top boxes (cable, satellite, IPTV)
- Game consoles
- Portable media players with TV-out functionality
- Professional/Industrial Video :
- Video surveillance systems (DVR outputs)
- Medical imaging displays
- Broadcast equipment (monitoring outputs)
- Video wall controllers
- Computing :
- PC graphics cards with analog video outputs
- KVM switches
- Presentation systems
### Practical Advantages and Limitations
Advantages:
- Integrated Solution : Combines filtering and driving functions in a single 20-pin package, reducing component count and board space.
- Excellent Frequency Response : The 6th-order Butterworth filter provides sharp roll-off (≥36 dB/octave) with minimal passband ripple (<0.1 dB), ensuring clean video signals.
- Flexible Power Supply : Operates from a single +5V supply or dual ±2.5V supplies, accommodating different system architectures.
- Low Differential Gain/Phase Error : Typically <0.1%/0.1°, preserving color accuracy in NTSC/PAL systems.
- Disable Function : Power-down mode reduces current consumption to <1 μA when outputs are not needed.
Limitations:
- Fixed Cutoff Frequency : The filter response is factory-set (typically 8 MHz for YPbPr, 6 MHz for CVBS), not user-adjustable. Different video standards may require external component modifications.
- Limited Output Drive : While adequate for most applications, the 70 mA drive current may be insufficient for exceptionally long cable runs (>50 m) or multiple parallel loads.
- Thermal Considerations : In continuous operation at maximum output swing, the device can dissipate up to 500 mW, potentially requiring thermal management in high-density designs.
- Single-Ended Only : The device processes single-ended signals only; differential video signals require additional conversion circuitry.
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## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Improper Power Supply Decoupling
- Problem : Inadequate decoupling leads to power supply noise coupling into the video signal, manifesting as visible hum bars or high-frequency artifacts.
- Solution : Place 0.1 μF ceramic capacitors within 5 mm of each power pin (VCC and V
