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FIN1108 Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FIN1108 Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 7 page 3 www.fairchildsemi.com Applications Signal Optimization via Internal Termination For LVDS signaling in point-to-point applications, receivers or repeaters with on-chip termination are preferable to reduce the overshoot or undershoot due to the reflection caused by stubs at receiver inputs. As a rule of thumb, usu- ally the termination resistor for an LVDS receiver should be placed as close as possible to the receiver, especially for high speed applications. If the distance between termina- tion resistors and receivers is too long, the interconnection will be seen as an un-terminated stub which can produce reflections resulting in higher EMI. Internal termination can effectively smooth out this ringing which can otherwise jeopardize the receiver noise margin. This is important for reliable high-speed operation with tighter required signal settling times. Below is a list of the advantages/disadvan- tages of internal termination. Internal termination is not suitable for all applications. In order to set a proper VOD at the driver outputs, receivers with on-chip termination resistors only work for point-to- point applications since multi-drop applications would require termination resistor for each receiver, reducing the equivalent termination to RT/n. This would reduce the driver output swing by n. Advantages: Disadvantages: 1. Reduced device count resulting in reduced board space and production cost. 1. Without special process treatment, on-chip termination can experience greater temperature variation. This is usually tolerable for low speed applications that have a sufficient unit interval. 2. Reduced reflections caused by the stub length on the receiver inputs, improving the signal integrity. 2. For applications with high common-mode noise, a center tapped capacitor at the receiver side is desirable to filter out the common-mode voltage noise of the input LVDS sig- nal. This scheme works for an external termination scheme with two (50 Ω each for nominal 100Ω termination resistor) half-value termination resistors connected in series and center tapped to a capacitor to Ground. To implement this scheme using internal termination resistors, a center tap pin would have to be used. This would increase the pack- age size of the part. |
Número de pieza similar - FIN1108 |
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Descripción similar - FIN1108 |
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