SerDes Selection Guide for Camera Applications
This technical reference document provides detailed information about jisemi product specifications, characteristics, and performance parameters. Use this information to support your design and analysis activities.
Electrical characteristics are specified over the operating temperature range unless otherwise noted. Parameters are guaranteed by design, testing, or statistical analysis. Typical values is the most likely parametric norm at 25°C.
Thermal characteristics require careful attention during system design. The junction-to-ambient thermal resistance depends on the mounting configuration, PCB copper area, and airflow conditions. Use thermal simulation tools to predict operating temperatures under actual conditions.
Reliability data is based on accelerated life testing and field failure analysis. Mean time between failures (MTBF) calculations follow industry-standard methodologies. Contact BeiLuo for detailed reliability reports and qualification data.
💡 FAE Insights
📋 Customer Cases
Asian Tier 1 camera supplier
Automotive
Challenge
Designing surround-view camera system with 4 cameras requiring reliable video transmission and power delivery over 12m cables.
Solution
Implemented JL2001 SerDes with power-over-coax following design guide recommendations. Used quality coaxial cable and implemented comprehensive production testing.
Customer Feedback
"Excellent practical guidance for camera system design"
Results
- Successfully transmitted 4x 1080p video streams
- Reliable power delivery to all camera modules
- Passed automotive qualification testing
- Zero field failures in first year of production
Frequently Asked Questions
1. How do I calculate SerDes bandwidth requirements?
Calculate bandwidth based on video resolution, frame rate, and bit depth. Formula: Bandwidth = Resolution × Frame Rate × Bit Depth × 1.2 (overhead). For example: 1080p (1920×1080) at 30fps with 12-bit color: 1920 × 1080 × 30 × 12 × 1.2 = ~900 Mbps. Add 20-30% margin for cable losses and future expansion. Control channel bandwidth is typically negligible compared to video.
2. What is the difference between coaxial and STP cable for SerDes?
Coaxial cable provides better signal integrity due to controlled impedance and shielding, enabling longer reach and higher data rates. It also supports power-over-coax for camera power delivery. STP is lower cost but has higher attenuation and crosstalk, limiting reach and bandwidth. Use coaxial for camera applications requiring power delivery or long reach (>10m). Use STP for cost-sensitive short-distance applications.
3. How do I implement power-over-coax correctly?
Power-over-coax implementation requires: 1) PoC filters at both ends to combine/separate power and signal. 2) Inductors rated for required current (typically 0.5-2A). 3) Voltage drop calculation: Vdrop = I × Rcable × 2 (round trip). 4) Input voltage selection to ensure minimum voltage at camera. 5) Filtering to prevent power noise coupling to signal. Typical design delivers 12V at 1A over 15m coaxial cable with ~2V drop.
4. What diagnostic features should I use for production testing?
Jisemi SerDes provides comprehensive diagnostics for production testing: 1) Cable fault detection (open/short) with ~1m resolution. 2) Link quality monitoring including eye diagram measurement. 3) BIST (Built-In Self-Test) for device functionality. 4) Temperature and voltage monitoring. Implement automated test sequences that verify all diagnostic features and log results. Use cable fault detection to identify wiring issues during production.
5. How do I ensure signal integrity in SerDes designs?
Signal integrity best practices: 1) Use quality coaxial cable with proper impedance (75Ω or 50Ω). 2) Minimize cable length and avoid sharp bends. 3) Implement proper PCB layout with controlled impedance traces. 4) Use appropriate connectors with good shielding. 5) Follow SerDes vendor layout guidelines for high-speed signals. 6) Validate signal integrity with eye diagram measurements. 7) Test across temperature range as cable characteristics change with temperature.