5-43MHz DC-Balanced 24-Bit FPD-Link II Deserializer 64-TQFP -40 to 105# Technical Documentation: DS90UR124IVSNOPB Serializer
Manufacturer : Texas Instruments (NS)
## 1. Application Scenarios
### Typical Use Cases
The DS90UR124IVSNOPB is a 21-bit to 24-bit FPD-Link II serializer designed for high-speed serial data transmission in embedded systems. Typical applications include:
- Camera Interface Systems : Converts parallel CMOS data from image sensors to serialized LVDS output
- Display Connectivity : Transmits video data from processors to display panels in automotive infotainment systems
- Sensor Data Aggregation : Serializes multiple sensor inputs for transmission over single cable assemblies
- Industrial Vision Systems : Enables long-distance transmission of high-resolution camera data in machine vision applications
### Industry Applications
- Automotive : Rear-view cameras, surround-view systems, driver monitoring cameras
- Industrial Automation : Machine vision cameras, robotic vision systems, inspection equipment
- Medical Imaging : Endoscopic cameras, dental imaging systems
- Consumer Electronics : High-resolution surveillance cameras, drone imaging systems
### Practical Advantages
- Cable Reduction : Transmits 21 data bits and 3 control bits over a single differential pair
- Noise Immunity : LVDS signaling provides excellent common-mode noise rejection
- Long Distance Transmission : Supports cable lengths up to 10 meters with proper cabling
- Low Power : Typically consumes 95mW at 85MHz pixel clock
- Integrated DC Balancing : Reduces EMI and enables AC-coupled interconnects
### Limitations
- Fixed Configuration : Limited to specific data mapping configurations
- Clock Dependency : Requires stable pixel clock input for proper operation
- Cable Quality Sensitivity : Performance degrades with poor quality cables or connectors
- Temperature Range : Industrial temperature range (-40°C to +85°C) may not suit extreme environments
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Power Supply Sequencing
- Pitfall : Improper power-up sequencing can cause latch-up or damage
- Solution : Follow manufacturer's recommended sequence: 1.8V core, then 3.3V I/O
Clock Integrity Issues
- Pitfall : Jittery or unstable pixel clocks cause synchronization failures
- Solution : Use dedicated clock generators with low jitter characteristics
Signal Integrity Problems
- Pitfall : Reflections and signal degradation in long cable runs
- Solution : Implement proper termination and use controlled impedance PCB traces
### Compatibility Issues
With Deserializers
- Must be paired with compatible FPD-Link II deserializers (DS90UR124-Q1 compatible family)
- Ensure matching data mapping configurations between serializer and deserializer
With Image Sensors
- Verify timing compatibility with CMOS sensor output formats
- Check voltage level compatibility (1.8V/3.3V I/O)
With Cable Assemblies
- Requires 100Ω differential impedance cables
- Maximum cable length limited by signal attenuation and skew
### PCB Layout Recommendations
Power Distribution
- Use separate power planes for 1.8V and 3.3V supplies
- Implement adequate decoupling: 10μF bulk + 0.1μF ceramic per power pin
- Place decoupling capacitors within 2mm of power pins
Signal Routing
- Maintain 100Ω differential impedance for LVDS pairs
- Keep LVDS traces equal length (±5mil tolerance)
- Route LVDS pairs with minimum 3X trace width spacing from other signals
- Avoid vias in LVDS differential pairs when possible
Grounding
- Use solid ground plane beneath entire device
- Implement split ground planes with proper stitching for analog and digital sections
- Ensure low-impedance return paths for high-speed signals
Component Placement
- Position serializer
