+3.3V Programmable LVDS Transmitter 24-Bit Flat Panel Display (FPD) Link-85 MHz/ +3.3V Programmable LVDS Transmitter 18-Bit Flat Panel Display (FPD) L# DS90C385MTD Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The DS90C385MTD is a high-performance LVDS (Low-Voltage Differential Signaling) serializer designed for high-speed digital video transmission applications. Typical use cases include:
- Digital Video Interfaces : Converts 28-bit parallel CMOS/TTL data to 4 LVDS data streams plus clock
- Flat Panel Displays : Drives LCD/OLED panels in automotive infotainment systems and industrial monitors
- Camera Systems : Transmits high-resolution video from image sensors to processing units
- Medical Imaging : Used in ultrasound machines and digital X-ray systems requiring noise-resistant transmission
- Robotics Vision : Enables reliable video transmission in industrial automation and machine vision applications
### Industry Applications
Automotive Industry :
- Center console displays and instrument clusters
- Rear-seat entertainment systems
- Advanced driver assistance systems (ADAS)
- Advantages : EMI compliance for automotive environments, wide temperature range (-40°C to +85°C)
- Limitations : Requires careful ESD protection in vehicle installations
Industrial Automation :
- Human-machine interface (HMI) panels
- Machine vision inspection systems
- Process control displays
- Advantages : Robust noise immunity in electrically noisy environments
- Limitations : Higher power consumption compared to newer serializer technologies
Medical Equipment :
- Patient monitoring displays
- Diagnostic imaging consoles
- Surgical display systems
- Advantages : Excellent signal integrity for critical medical imaging
- Limitations : May require additional shielding in sensitive medical environments
### Practical Advantages and Limitations
Advantages :
- High Noise Immunity : LVDS differential signaling provides excellent common-mode noise rejection
- Long Distance Capability : Supports cable lengths up to 10 meters
- Low EMI : Reduced electromagnetic interference compared to single-ended signaling
- Power Efficiency : Lower power consumption than traditional RS-422/485 interfaces
- High Speed : Supports data rates up to 112 MHz, enabling high-resolution video transmission
Limitations :
- Complex Termination : Requires precise termination resistors (100Ω differential)
- PCB Layout Sensitivity : Demands careful routing for differential pairs
- Cost Consideration : Higher component cost compared to single-ended solutions
- Compatibility : Limited to systems designed for LVDS interface standards
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Improper Termination
- Issue : Missing or incorrect termination resistors causing signal reflections
- Solution : Place 100Ω differential termination resistors close to receiver inputs
Pitfall 2: Signal Integrity Problems
- Issue : Skew between data channels leading to timing violations
- Solution : Maintain matched trace lengths for all LVDS pairs (±5mm maximum difference)
Pitfall 3: Power Supply Noise
- Issue : Inadequate decoupling causing jitter and signal degradation
- Solution : Use multiple 0.1μF ceramic capacitors placed near power pins
Pitfall 4: Grounding Issues
- Issue : Improper ground return paths creating common-mode noise
- Solution : Implement solid ground plane and avoid ground splits under differential pairs
### Compatibility Issues with Other Components
Power Supply Compatibility :
- Requires clean 3.3V supply with <50mV ripple
- Incompatible with 5V systems without level shifting
Interface Compatibility :
- Compatible with FPD-Link receivers and standard LVDS inputs
- May require level translation when interfacing with newer sub-LVDS components
Clock Domain Issues :
- Input clock must meet strict jitter specifications (<500ps)
- May require clock cleaning circuits when sourced from noisy oscillators
### PCB Layout Recommendations
Differential Pair
