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ths8136
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  • Forum Post: THS8136 shutdown mode / quiescent current ?

    Philippe MAIRE
    Hi, Is there a way to put the THS8136 in a "disabled" low power mode? I see no specific shutdown pin... If I disable the CLKIN and put all data inputs to "0", what would then be the quiescent current consumption ?
    on Jun 2, 2010

  • Forum Post: Re: THS8136 shutdown mode / quiescent current ?

    Larry Taylor
    Hi Philippe, The THS8136 does not have a power down pin, but switching off the digital 1.8V power spupply will put the DACs in a reset, low power state. The 3.3V analog supply current should be less than 1 mA in this state. Disabling CLKIN or the digital inputs will have little impact on the analog...
    on Jun 2, 2010

  • Forum Post: Re: THS8136 shutdown mode / quiescent current ?

    Philippe MAIRE
    Hi, and thanks for your quick answer! Do you have part with equivalent functionality and performance with a logic shutdown function? I would like to avoid an external MOS. Philippe
    on Jun 3, 2010

  • Forum Post: Re: THS8136 shutdown mode / quiescent current ?

    Larry Taylor
    Phiippe, Sorry, but we do not have a similar device that has a power down pin. This would have been a nice feature, but we did not have a spare pin on the package to add this.
    on Jun 3, 2010

  • Forum Post: Re: THS8136 shutdown mode / quiescent current ?

    Philippe MAIRE
    Hi, thanks for your answer. I will find a way to turn the supply off. Philippe
    on Jun 3, 2010

  • Forum Post: THS8136 digital clamps maximum current

    Philippe MAIRE
    Hi, Following this topic: http://e2e.ti.com/support/data_converters/videoconverters/f/376/p/50703/179267.aspx I want to put the digital part of the THS8136 in shutdown by turning off DVDD. I have another component connected on the digital pixel bus, so I cannot turn it off while the THS is in shutdown...
    on Jun 16, 2010

  • Forum Post: THS8136 turn off AVDD with DVDD on

    Philippe MAIRE
    Hi, Is it possible to shutdown the analog power supply of the THS8136 while the digital power supply is still on? (and some data is flowing on CLK and pixel inputs) Would this damage the part ? Will I get leakage currents ? The datasheet does not show any DVDD to AVDD relationship/maximum voltage...
    on Jun 17, 2010

  • Forum Post: Re: THS8136 turn off AVDD with DVDD on

    Larry Taylor
    Philippe, I measured input current with 1.8V connected to all 30 RGB input bits. 50 ohm series resistors were present on all input bits. Total input current was 25ua with all supplies on. No change in input current was observed when the 3.3V supply was turned off, or tied to GND. Total input current...
    on Jun 18, 2010

  • Forum Post: Re: THS8136 turn off AVDD with DVDD on

    Philippe MAIRE
    Hi Larry, Thanks for your quick answer. When you give your "total input current" is it the sum of 3.3V supply + 1.8V supply ? When you turned off 1.8V supply, did you turn off the digital inputs as well, or relied on the clamp diodes + series resistors to protect the device ? ...
    on Jun 18, 2010

  • Forum Post: Re: THS8136 turn off AVDD with DVDD on

    Larry Taylor
    Phiippe, The total input current is the total current into the RGB digital inputs from a 1.8V supply connected to all RGB digital inputs. I measured this to look for a change in input bus loading when the THS8136 supplies are shut off. The table below shows this total input current along with THS8136...
    on Jun 21, 2010

  • Forum Post: Re: THS8136 turn off AVDD with DVDD on

    Philippe MAIRE
    Hi Larry, Thank you very much for your in-depth support. There is something I don't understand: when all is on, why does the THS draw 25mA on the RGB inputs? If I understood well, all 24 inputs bits are tied to a static 1.8V power supply, only the clock is switching. I would expect to...
    on Jun 22, 2010

  • Forum Post: Re: THS8136 turn off AVDD with DVDD on

    Larry Taylor
    Sorry, should have been 25uA. Thanks for checking my work. Regards, Larry
    on Jun 22, 2010

  • Forum Post: Re: THS8136 turn off AVDD with DVDD on

    Philippe MAIRE
    Hi Larry, Perfect :-) If you still have the board nearby, could you check that the currents for "1.8VDVDD tied to GND, 3.3VAVDD on" are equivalent with 1.8VDVDD open instead of shorted to GND ? I am afraid that the 1V8 could be supplied by the inputs if the current can't flow to...
    on Jun 23, 2010

  • Forum Post: Re: THS8136 turn off AVDD with DVDD on

    Larry Taylor
    Philippe, The readings were the same with the supplies open instead of shorted. Regards, Larry
    on Jun 24, 2010

  • Blog Post: New Application Note Releases

    Foe
    The following new TVP/THS application notes are now available from ( http://www.ti.com/ ). Literature Number Release Date Description SLEA073A August 2009 TVP5158 PCB Layout Guidelines SLEA075 September 2009 TVP5151 PCB Layout Guidelines SLEA076 June 2010 THS8134B PCB Layout Guidelines...
    on Jul 29, 2010

  • Forum Post: Is THS8136 output port protected?

    Tetsuro Fukuhara
    Hi, My customer worry about THS8136 behaviors if any of the output ports are shorted with GND accidentaly. It will be ok if the THS8136 becomes completely damaged without any current flow but not good if big current flow remains. Is there any protection circuit inside THS8136? What is the maximum...
    on May 11, 2011

  • Forum Post: Re: Is THS8136 output port protected?

    Larry Taylor
    Fukuhara-san, Shorting to GND should not cause damage. The DACs are current sources and should not exceed the full-scale output curent when shorted to GND. Shorting to a voltage higher than the THS supply is more of a concern than shorting to GND. Best regards, Larry
    on May 11, 2011

  • Forum Post: Re: Is THS8136 output port protected?

    Tetsuro Fukuhara
    Larry, Thank you for the answer. Best regards, T. Fukuhara
    on May 12, 2011

  • Forum Post: input format to ths8136

    yogesh joshi
    hi, I am working with THS8136. I want to know the format in which RGB data is supplied to the chip.There is nothing given about it in datasheet... If some ITU standard has to be followed then,please explain the format of it too...
    on May 28, 2011

  • Forum Post: Re: pcb designing of ths8136

    Larry Taylor
    Please see the CAD symbols in the THS8135 product folder. The package and pin-out are the same. You may also be able to start with a standard 48-pin TQFP and then add the copper for the thermal pad.
    on May 31, 2011

  • Forum Post: Re: input format to ths8136

    Larry Taylor
    Hi, The THS8136 is aimed primarily at 24/30-bit RGB graphics. See attached for various RGB formats. Many of these can also be found in the VESA DMT specification. Note that there is an 8-pixel latency though the DACs. HSYNC need to be delayed 8 pixels to align with the analog RGB output.
    on May 31, 2011

  • Forum Post: clock signal to ths8136 and about the input..

    yogesh joshi
    hello I am using ths8136 as a dac for svga output. I have to give input using a microcontroller . The resolution on which i am currently working is 640x480. I calculated and the frequency of clock was found to be 58.59375MHz(with 25/s as the refresh rate). Since there is only 1 pin in the IC, i...
    on Jun 7, 2011

  • Forum Post: Re: clock signal to ths8136 and about the input..

    yogesh joshi
    please i really need a lot of help.. on this ic
    on Jun 8, 2011

  • Forum Post: Re: clock signal to ths8136 and about the input..

    Larry Taylor
    Yogesh, What VGA 640x480 refresh rate do you need for you application? VGA60Hz, for example, typically has HSYNC=31.469KHz, VSYNC=59.94Hz, Total pixels/line = 800pixels, Total line/fame = 525, and Pixel Clock= 25.175Mhz. Is the 640x480 active frame being generated by the micro? How is the 58...
    on Jun 8, 2011

  • Forum Post: Re: clock signal to ths8136 and about the input..

    yogesh joshi
    thanx for the response larry... i am using a monitor for display.... The refresh rate i am using is 30... should i increase it bcoz i am not sure what should be the refresh rate... my guide said 30 or 25 so i said k... how to know the refresh rate??? and about the micro:;;; i am using micro to produce...
    on Jun 9, 2011
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