800 Mbps 2x2 LVDS Crosspoint Switch 16-SOIC -40 to 85# DS90CP22MX8NOPB Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The DS90CP22MX8NOPB from Texas Instruments (formerly National Semiconductor) is a high-performance LVDS deserializer primarily designed for:
High-Speed Serial Data Reception
- Converts 4-channel LVDS serial data streams back to 28-bit parallel CMOS/TTL data
- Operates with serial data rates up to 2.38 Gbps total bandwidth
- Ideal for point-to-point data transmission systems requiring noise immunity
Clock Embedded Systems
- Recovers clock from incoming serial data stream
- Supports spread spectrum clocking (SSC) for EMI reduction
- Maintains synchronization with minimal clock skew
### Industry Applications
Automotive Infotainment Systems
- Camera video data reception (rear-view, surround-view systems)
- Display link interfaces for instrument clusters
- High-speed sensor data aggregation
- *Advantage:* Robust EMI performance meets automotive EMC requirements
- *Limitation:* Operating temperature range may require additional thermal management in extreme environments
Industrial Automation
- Machine vision camera interfaces
- Robotic control system data links
- PLC-to-I/O module communications
- *Advantage:* Long-distance capability (up to 10m with proper cabling)
- *Limitation:* Requires matched impedance cabling for optimal performance
Medical Imaging Equipment
- Ultrasound data acquisition systems
- Digital X-ray sensor interfaces
- Endoscopic camera data transmission
- *Advantage:* High noise immunity critical for medical signal integrity
- *Limitation:* May require additional isolation for patient-connected applications
Professional Video Systems
- Broadcast camera control interfaces
- Video wall distribution systems
- Digital signage content distribution
- *Advantage:* Low jitter performance maintains video quality
- *Limitation:* Limited to specific data formats requiring protocol conversion
### Practical Advantages and Limitations
Advantages:
- Power Efficiency: 165 mW typical power consumption at 65 MHz
- Noise Immunity: LVDS technology provides excellent common-mode noise rejection
- Cable Reduction: Replaces 28 parallel lines with 4 differential pairs
- Integrated Features: Built-in termination and pre-emphasis support
Limitations:
- Complex Implementation: Requires careful impedance matching and layout
- Protocol Dependency: Must be paired with compatible serializer (DS90CP21)
- Cost Consideration: Higher component cost than parallel solutions for short distances
- Training Required: Needs proper initialization sequence for reliable operation
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Power Supply Decoupling
- *Pitfall:* Inadequate decoupling causing signal integrity issues
- *Solution:* Use 0.1 μF ceramic capacitors placed within 5mm of each power pin
- *Additional:* Implement bulk capacitance (10 μF) near device power entry points
Signal Integrity Management
- *Pitfall:* Excessive jitter due to improper termination
- *Solution:* Ensure 100Ω differential termination at receiver inputs
- *Additional:* Use controlled impedance PCB traces (100Ω differential)
Clock Recovery Issues
- *Pitfall:* Loss of synchronization during low-frequency operation
- *Solution:* Maintain minimum 20 MHz input frequency
- *Additional:* Implement proper reset sequencing during power-up
### Compatibility Issues
Serializer Pairing
- Must be used with DS90CP21 serializer for proper operation
- Incompatible with other LVDS serializer protocols without modification
- Clock training patterns must match between transmitter and receiver
Voltage Level Compatibility
- 3.3V core voltage operation
- LVDS inputs compatible with standard LVDS levels (100mV differential)
- CMOS outputs compatible with 3.3V logic families
Data Format Requirements
- Expects specific serialization format (
