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5P49V5914 Datasheet(PDF) 29 Page - Integrated Device Technology |
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5P49V5914 Datasheet(HTML) 29 Page - Integrated Device Technology |
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REVISION B 07/13/15 29 PROGRAMMABLE CLOCK GENERATOR 5P49V5914 DATASHEET LVDS Driver Termination For a general LVDS interface, the recommended value for the termination impedance (ZT) is between 90. and 132. The actual value should be selected to match the differential impedance (Zo) of your transmission line. A typical point-to-point LVDS design uses a 100 parallel resistor at the receiver and a 100 . differential transmission-line environment. In order to avoid any transmission-line reflection issues, the components should be surface mounted and must be placed as close to the receiver as possible. The standard termination schematic as shown in figure Standard Termination or the termination of figure Optional Termination can be used, which uses a center tap capacitance to help filter common mode noise. The capacitor value should be approximately 50pF. In addition, since these outputs are LVDS compatible, the input receiver's amplitude and common-mode input range should be verified for compatibility with the IDT LVDS output. If using a non-standard termination, it is recommended to contact IDT and confirm that the termination will function as intended. For example, the LVDS outputs cannot be AC coupled by placing capacitors between the LVDS outputs and the 100 ohm shunt load. If AC coupling is required, the coupling caps must be placed between the 100 ohm shunt termination and the receiver. In this manner the termination of the LVDS output remains DC coupled. LVDS Driver LVDS Driver LVDS Receiver LVDS Receiver ZT C ZO ZT ZO ZT ZT 2 ZT 2 Standard Termination Optional Termination |
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