• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 34 subscribers
  • Views 66 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.

THVD1424: Inquiry Regarding LTC2854 Supply Current Measurement Conditions

kz_sk
Intellectual 465 points

Part Number: THVD1424

Dear Technical Support,
I have a question regarding the LTC2854 datasheet.
In Figure 6-3, "Supply Current vs. Supply Voltage", the supply current is approximately 40 mA at VCC = 3.3 V.
The graph specifies the following test conditions:

RL = 54 ohm

DE = VIO

D = VIO

Could you please clarify whether the internal 120 ohm termination resistor is enabled (ON) or disabled (OFF) under these measurement conditions?
Additionally, if the internal termination resistor is enabled, does the specified supply current include the current associated with the internal termination resistor?
We are evaluating the device's power dissipation and thermal performance, so a detailed explanation of the measurement conditions would be greatly appreciated.
Thank you for your support.

  • 0
    Intellectual 465 points

    Figure 6-3, "Supply Current vs. Supply Voltage"

  • 0
    TI__Guru* 81621 points
    kz_sk said:
    Could you please clarify whether the internal 120 ohm termination resistor is enabled (ON) or disabled (OFF) under these measurement conditions?

    The internal resistor is not enabled. This test is using an external 54 ohm resistor.

    kz_sk said:
    Additionally, if the internal termination resistor is enabled, does the specified supply current include the current associated with the internal termination resistor?

    You can estimate the current consumption of the driver of the device (with internal resistor enabled) by just taking the VoD divided by the internal resistor. 

    So about 4V/120 ohms is about 33mA. So in the graph if the resistor is enabled, you should see an additional ~30mA at the 5Vcc level.