• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 34 subscribers
  • Views 85 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.

SN65LVDS20: Question Regarding SN65LVDS20 Disabled-State Power Consumption

Reza Javaheri
Prodigy 20 points

Part Number: SN65LVDS20

Dear TI Support Team,

We are using the SN65LVDS20 (LVPECL-to-LVDS translator/repeater) in one of our products and are reviewing options to reduce power dissipation during thermal qualification testing.

According to the datasheet, a high level on EN places the outputs in a high-impedance state, while a low level enables the outputs. 

However, we could not find information regarding the supply current or power consumption when the device is disabled.

Could you please clarify the following:

  1. What is the typical and maximum ICC supply current of the SN65LVDS20 when EN = High (outputs disabled / Hi-Z)?
  2. Does asserting EN = High disable only the output drivers, or are any internal receiver/bias circuits also powered down?
  3. Is there any measured or estimated percentage reduction in power consumption when the device is disabled compared to the enabled state?
  4. Are there any application notes or characterization data showing power dissipation versus EN state and operating frequency?

For context, our design contains multiple SN65LVDS20 devices which are currently enabled continuously, and we are trying to estimate the potential thermal benefit of controlling the EN signal.

Thank you for your support.

Best regards,

Reza Javaheri
Business R&D Senior Professional
Hitachi Energy
Västerås, Sweden
reza.javaheri@hitachienergy.com

  • 0
    TI__Genius 17846 points

    Hi Reza, 

    If /EN is High, then the device will act as if the outputs are unloaded, correlating to the second ICC spec. Unfortunately this is the only characterized data point we have for this device. The /EN pin only affects the differential output pins, not VBB. 

    Regards,

    Matt