SLLU358 November   2022 DS90LVRA2

 

  1.   1
  2.   Trademarks
  3.   Features
  4.   Applications
  5. 1Hardware
    1. 1.1 Setup
    2. 1.2 Jumpers Information
  6. 2Hardware Design Files
    1. 2.1 Schematics
    2. 2.2 PCB Layouts
    3. 2.3 Bill of Materials (BOM)
  7. 3References

1.2 Jumpers Information

A jumper (JMP1) has been provided on the board if the transmitter common mode voltage does not meet the DS90LVRA2 receiver common mode voltage requirement. In this case, do the following:

  • Replace R3, R4, R5, and R6 with AC coupling capacitors. The value of AC coupling capacitors depends on the operating frequency, as it needs to block the DC component, but look like a short circuit for the AC component
  • Populate L1
  • Populate R12, R13, R14, R15, R16, R17, R18, and R19
  • Remove JMp1
  • Provide the appropriate VCC_TERM such that it restores the DS90LVRA2 receiver DC common mode voltage to 1.2 V which is in the middle of the input common mode range for a standard LVDS receiver.

For more detailed information about DC and AC coupling LVDS receivers, refer to the How to Terminate LVDS Connections wth DC and AC Coupling application note.