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TRS3122E: About estimation of power consumption

Tao_2199
Genius 5660 points
Part Number: TRS3122E

Hello,

 

Regarding to estimation of power consumption at 32Kbps on TRS3122E, my customer is asking some question.

They are referring below characteristic(datasheet page6,Figure 1) for power consumption.

(Question)

(1)About supply current (Y-axis) in Figure 1.

Does it mean current on VL(Logic-level supply) or Vcc(supply voltage)?

(2) They understand as following about Figure 1.

Driver2 is on 32Kbps and it means the supply current of Driver1 each 250/500/1000kbps.

If so, how does the receiver power consumption estimate?

Can the drive current of receiver estimate as power consumption ?

(3) Do you have the supply current data at 32kbps on Figure 1?

 

Regards,

Tao2199

  • 0
    TI__Mastermind 25705 points
    Tao,
    To answer your questions:
    1) the data from Figure 1 is supply current;
    2) comparing to the driver, the receiver has very small power dissipation; The power of the driver depends on the load (capacitor) and the data rate.
    3) under what condition does your customer need the power data? Vcc, VL, Ch1 - data rate/R load/C load, Ch2 - data rate/R load/C load?
    Regards,
    Hao
  • 0 in reply to Hao L
    Genius 5660 points

    Hello Hao,

     

    Thank you for reply.

     

    I’m asking about some conditions at 32kbps to my customer.

    About the supply current which you mentioned,

    >1) the data from Figure 1 is supply current;

    It means the current of Vcc(supply voltage).

    My understanding is correct?

    I ask about it just in case.

     

    Regards,

    Tao2199

  • 0 in reply to Tao_2199
    TI__Mastermind 25705 points

    Tao,

    Yes. The data is the Vcc current. Please let me know when you get more details about 32kbps communication.

    Regards,

    Hao

  • 0 in reply to Hao L
    Genius 5660 points

    Hello Hao,

     

    My customer has informed following conditions for power consumption.

    ･VCC=3.3V, VL=1,8V

    ･Driver CH1/2: 19.2Kbps

    ･Load Capacitance: 4000pF

     

    Could you please tell us about power consumption at 19.2Kbps communication?

     

    Regards,

    Tao2199

  • 0 in reply to Tao_2199
    Genius 5660 points

    Hello Hao,

     

    Would you let me know current status about estimation of power consumption?

    (Conditions)

    ･VCC=3.3V, VL=1,8V

    ･Driver CH1/2: 19.2Kbps

    ･Load Capacitance: 4000pF

     

    Regards,

    Tao2199

  • 0 in reply to Tao_2199
    TI__Mastermind 25705 points

    Tao,

    Sorry for the delay. It was a holiday in US yesterday. Since the data rate is low, the power dissipation is similar with 3kOhm DC load. The nominal power is 4.5mA with 3.3V supply and 8mA with 5V supply. The test condition was both Dout1 and Dout2 have 19.2kbps signal with 4000pF load each. Please let me know if you have any questions.

    Regards,

    Hao

  • 0 in reply to Hao L
    Genius 5660 points

    Hello Hao,

    I informed to my customer power dissipation .
    Many thanks!

    Regards,
    Tao 2199