• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 33 subscribers
  • Views 388 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LVDS Receiver output

Prabath Palathingal
Prodigy 10 points
Other Parts Discussed in Thread: DS90LV012A

I am new to LVDS technology  so please correct me if I am wrong.  I have a board that has LVDS driver with 100ohm resistor termination. I am trying to provide the output differential signal from the driver to a LVDS receiver(DS90LV012A  3V LVDS Single CMOS Differential Line Receiver). As per the datasheet the output of the LVDS receiver should be a TTL signal. So in order to test the IC I passed  100 mV sine wave to IN+ pin of  the IC and grounded the IN- pin. So theoretically shouldn't I be getting a TTL signal of the same voltage as the sine wave? 

  • 0
    TI__Guru* 93670 points

    Greetings,

    Please refer to the LVDS(Low Voltage Differential Signalling) Standard Specifications(TIA/EIA-644-A). DS90LV012A complies with this specification. Per this specification, the applied voltage at the receiver terminal are referenced to the circuit common mode voltage. The minimum common mode voltage is specified as 0.050 while the minimum differential input voltage swing is 100mV. Given the nature of the differential signaling of the LVDS interface we cannot tie one terminal to GND or VCC since this would make the device to operate in single ended fashion vs LVDS Mode(i.e differential mode).

    Regards,,nasser