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TLK10034 supplies questions

Uzi Ben-Zon
Prodigy 110 points
Other Parts Discussed in Thread: TLK10034

Dear Mr./Ms.

 

1. When the datasheet says that recommended operating condition, IDD, VDDRA/B/C/D_LS is 168mA, does it means that the total current of all channel is 168mA or maybe it refers to a one channel only?

2. Same question as above applies also for VDDRA/B/C/D_HS and VDDO[3:0].

3. In case the above answer is that the values are the sum of all channels, what would be the supply current in case that only one channel is enabled and the other three are disabled and no clock is supplied to them?

4. The EVM uses LDO to step down the various voltage supplies, does it really needed or perhaps a switching regulators will do the work? Please refer to each of the supplies.

 

Many thanks,

Uzi

 

  • 0
    TI__Mastermind 20820 points

    Hi Uzi,

    The IDD that is specified in the data sheet for the TLK10034 in regards to the VDDRA/B/C/D_LS,  VDDRA/B/C/D_HS, and VDDO is all four channels combined (~42mA/channel for VDDRA/B/C/D_LS). This is the worst case scenario for power consumption and these values will change depending on the mode that the device is operating in (i.e. 4:1, 2:1...).

    If only one channel is enabled the VDDO current draw will be roughly the same because it cannot be disabled. You can expect though approximately 1/3 of the power consumption on the VDDRA/B/C/D_LS,  VDDRA/B/C/D_HS, VDDA, and VDDD rails.

    It is OK to use switching regulators in your design on any of the rails of the TLK10034, we decided to use LDOs on our EVM design because we wanted a clean power supply for the chip. If you decide to use switching regulator in your final design please make sure to use great care in the design of noise filtering so the power supplies of the TLK10034 can be as clean as possible.

    Regards,

    Mike

  • 0 in reply to Michael Peffers
    Prodigy 110 points

    What about DVDD + VPP and VDDT_LS/HS, are they also consume 1/3 of the power when only one channel is enabled?

    Thanks,

    Uzi

     
  • 0 in reply to Uzi Ben-Zon
    TI__Mastermind 20820 points

    Hi Uzi,

    DVDD + VPP and VDDT_LS/HS will also consume 1/3 less power when only one channel is enabled.

    Regards,

    Mike