SNOU184 November   2021 TLV3801

 

  1.   Trademarks
  2. 1Introduction
  3. 2Features
  4. 3EVM Specifications
  5. 4Recommended Equipment
  6. 5How to Make a TPHL Propagation Delay Measurement With Split Supplies
  7. 6Board Setup
    1. 6.1 Supply Voltage
    2. 6.2 Inputs
    3. 6.3 Outputs
  8. 7Layout Guidelines
  9. 8Schematic
  10. 9Bill of Materials

6.3 Outputs

C10 and C11 are installed with 0.1-uF capacitors. If a 100-Ω differential probe is unavailable to measure the LVDS output, these capacitors allow for the AC portion of the signal to be seen on a 50-Ω terminated scope. Keep in mind that any duty cycle other than 50% will result in a DC portion of the signal that is not halfway between VOH and VOL. As mentioned earlier, this is because of the charging and discharging of the capacitors. A higher duty cycle will result in a higher DC output voltage because the capacitors are charging more than they are discharging.

Figure 6-4 Output Side Schematic

If equipment is available to measure the LVDS output with a respect to the 100-Ω resistor or with a differential probe, then C10 and C11 can be replaced with 0-Ω resistors to keep the DC integrity of the output signal.