Split termination in a CAN bus offers advantages over standard 120-ohm termination, especially in electrically noisy environments. Here’s why it’s preferred in certain applications:
1. Enhanced Electromagnetic Interference (EMI) Suppression
- Split termination uses two 60-ohm resistors with a capacitor (typically 10nF) in between.
- The capacitor acts as a low-pass filter, reducing high-frequency noise and improving signal stability.
- Helps prevent unwanted voltage fluctuations caused by external interference.
2. Better Common-Mode Noise Reduction
- CAN bus systems are susceptible to common-mode noise, which can cause transmission errors.
- The capacitor in split termination helps stabilize the common-mode voltage, reducing noise pickup.
- Improves performance in automotive, industrial, and long-distance CAN networks.
3. Improved Differential Signal Integrity
- Unlike a single 120Ω resistor, split termination evenly distributes resistance across the network.
- This minimizes signal distortion, resulting in a cleaner and more reliable differential signal.
4. Increased Stability in High-Speed Applications
- At higher CAN speeds (e.g., 500 kbps or 1 Mbps), reflections and noise can become problematic.
- Split termination improves signal integrity, reducing the risk of bit errors.
When to Use Split Termination?
- If your system is in a harsh electrical environment, like near motors or RF sources.
- If your CAN network operates at higher speeds.
- If noise immunity is a major concern, especially in automotive and industrial applications.
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