LXT300/300Z/304A/305A Integrated Short-Haul Transceivers Crystal Layou
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LXT300/300Z/304A/305A Integrated Short-Haul Transceivers Crystal Layout Guidelines
Level transceivers designed robust operation. Good design practices also contribute overall application reliability. This application note reminds design engineers layout considerations that will make LXT300, LXT300Z, LXT304A LXT305A transceiver applications even more effective. designs should crystal input these transceivers minimize coupling other digital analog signals into XTALOUT XTALIN. figure below. These inputs (pins products included this note) high impedance nodes which pick interference from adjacent traces other components board. Adhering these considerations will help ensure proper operation. Before beginning design LXT300series family transceivers, consider following points: crystal that meets recommended crystal specifications (see appropriate Data Sheet) Minimize trace lengths between transceiver 6.176 8.192 crystal (typically less than 0.25 Shield these connections area around crystal with ground planes Keep other high speed system clocks away from crystal leads traces Locate magnetic components well away from crystal, leads traces Keep high energy signals away from crystal leads traces connected pins
Crystal Layout LXT300-Family Transceivers
Ground Plane Shielding 6.176 8.192 Crystal less than 0.25
XTALOUT
XTALIN
LXT300/300Z/304A/305A
TTIP TPOS TNEG TCLK to/from Digital Backend Logic XMIT lines TRING
LXT300/300Z 304A/305A
RPOS RNEG RCLK
RTIP from lines RRING
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