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  • Forum Post: Re: LMH0384 configuration

    John Goldie
    Greetings - Sorry for the holiday delay in response. The network shown is for the SMPTE return loss network that is commonly used with coax media. If you use the EQ with a differential input, usually that line is terminated in 100 Ohms and then AC coupled to the EQ inputs. In some applications...
    on Jan 4, 2012

  • Forum Post: LMH0074 cable equalizer

    Tamas Szabo92080
    Does anyone have any experience equalizing Cat-5/6/7 twisted pair cable with LMH0074 or similar. I would use it with 125Mbps 4B5B NRZI signal. What could be the maximum feasible cable length?
    on Jan 6, 2012

  • Forum Post: Re: LMH0384 configuration

    Gary Melchior
    The LMH0384 and LMH0394 3G/HD/SD SDI Adaptive Cable Equalizers automatically adapt to the input signal, and will equalize signals with data rates from 125 Mbps to 2.97 Gbps by default. These equalizers do not need to be configured for a specific data rate.
    on Jan 23, 2012

  • Forum Post: Re: About DS32EL0124

    John Goldie
    Greetings - Please review the DS32EL0124 datasheet. The deviced to specified for CLOCK rates in the 125MHz to 312.5MHz range. SD video will be 27MHz clock which is far below the operating range of this version of the part. Please also review related part LMH0341 datasheet, this version of the...
    on Feb 13, 2012

  • Forum Post: Re: LMH0395 Pin settngis in SPI mode

    Nasser Mohammadi
    Mita-San, Using the LMH0395 device, the Auto Sleep and the Bypass can be controlled via the SPI interface independent of the hardware pin. However for the SDO1_Disable you must have the pin enabled then you can either enable or disable via SPI register. Regards,,nasser
    on Feb 14, 2012

  • Forum Post: Re: Dose TI has "270Mbps Deserializer for SDI" ?

    John Goldie
    Greetings - YES, with the acquisition of National Semiconductor, TI now has an extensive family of devices for SDI / SMPTE applications. You noted a SD 270 Mbps rate SDI , please see the CLC020 or CLC021. The complete line of SDI SERs can be viewed at: http://focus.ti.com/paramsearch/docs...
    on Mar 14, 2012

  • Forum Post: Re: Dose TI has "270Mbps Deserializer for SDI" ?

    Gary Melchior
    John talked about serializers. For replacing a 270 Mbps SDI deserializer, we have the following options: LMH0031 HD/SD SDI Deserializer LMH0071 SD SDI Deserializer (+ FPGA) The LMH0071 requires a host FPGA but offers flexibility and a future upgrade path. Here is a link to TI's...
    on Mar 14, 2012

  • Forum Post: Re: LMH0302 as single ended reciever.

    Gary Melchior
    The LMH0302 input is high impedance, so it can be terminated in whatever impedance works best for your application. The input to the LMH0302 can be single ended provided the unused input is properly terminated. If your input is 75 ohms single ended and AC coupled, then configure the LMH0302 input...
    on Mar 28, 2012

  • Forum Post: Re: LMH0384 equalizer

    Gary Melchior
    The LMH0384 is an adaptive equalizer. It automatically adjusts to reverse the effects of the cable loss. The LMH0384 Launch Amplitude settings (SPI register 0x02 bits 7:3) allow additional manual adjustments to the equalizer gain to compensate for attenuation prior to the equalizer. This can be used...
    on Mar 29, 2012

  • Forum Post: Re: LMH0302 SDO complement output

    Gary Melchior
    As suggested, SNLA118B: Application Note 1972 "Board Layout Challenges in Serial Digital Interface" shows the proper schematic (Figure 6) and also a good suggested PCB layout (Figure 7) for the LMH0302 SDI cable driver with one active output. http://www.ti.com/litv/pdf/snla118b The unused...
    on Apr 9, 2012

  • Forum Post: Re: LMH0387 IBIS Model

    John Goldie
    Greetings - Here is a two part response to your question. IBIS models single-ended and differential two levels drivers pretty well based on V/I and V/T tables. It is less intended for Signal Conditioning features such as Equalization and transmit emphasis (Pre-E and De-E). A new extension of IBIS...
    on Apr 20, 2012

  • Forum Post: RE: Bi-directional HD-SDI over same coax possible ?

    John Goldie
    Greetings - Currently the streaming video application would likely need two COAX lines, one for each direction. There are schemes to send control channels in the opposite direction of the video (Channel Link 3 for example) and other ways to do this but usually the signals are freq isolated not the...
    on May 25, 2012

  • Forum Post: RE: Clarification regarding LMH0387 SDI Configurable I O Demo

    Gary Melchior
    The LMH0387 SDI configurable I/O device allows a single BNC to be used as either an SDI input or SDI output. It is intended to be placed behind a BNC connector to interface to a 75 ohm coaxial cable. The LMH0387 can be programmed to either drive an SDI signal over this cable or receive an SDI signal...
    on Jun 14, 2012

  • Forum Post: TLK10002 Video Application Question

    David Escandon
    TI Team, I have a new application that involves HD video. I was wondering if you could answer a few questions about the TLK10002. I need to mux/demux 3 SDI signals that vary in speed. Here are the rates for the different protocols I'm trying to support: SD-SDI: 270 Mbit/s, 360 Mbit/s, 143 Mbit...
    on Jun 13, 2012

  • Forum Post: RE: LMH0387 SDI Support

    Gary Melchior
    David, Please explain how you would like to use the LMH0387 3G/HD/SD SDI configurable I/O to support dual link. The LMH0387 can be configured as either an SDI cable equalizer or an SDI cable driver. The same device pin is used for both the equalizer input and cable driver output, which allows the...
    on Jun 25, 2012

  • Forum Post: RE: Replacement for CLC014AJE

    John Goldie
    Greetings - There is also a AP Note on this topic for upgrading to tghe LMH0074. Please see: http://www.ti.com/lit/an/snla123/snla123.pdf John Goldie
    on Jun 27, 2012

  • Forum Post: RE: LMH0302, LMH0344 BSDL files

    John Goldie
    Greetings - The two parts do not have a JTAG port, there are no BSDL models for them. Please clarify request. John
    on Jul 28, 2012

  • Forum Post: RE: LMH0395 - Input Termination

    Gary Melchior
    The recommended termination resistor value for the unused LMH0395 input is 49.9 ohms (per the datasheet), but you could use the typical 37.4 ohms here if you prefer. The LMH0395 behaves differently than the LMH0384 because it has two output drivers, and using this higher value termination (i.e. 49.9...
    on Aug 1, 2012

  • Forum Post: RE: LMH0395 - Input Termination

    Gary Melchior
    The LMH0395 evaluation board was designed before we optimized this input termination circuit, and we will use 49.9 ohms for the unused input termination in future revisions. You really would be okay using either resistor value as the jitter is only slightly reduced when using 49.9 ohms vs. 37.4 ohms...
    on Aug 1, 2012

  • Forum Post: RE: LMH0307 termination

    Gary Melchior
    Please provide more details about this application. What specific output amplitude is required from the LMH0307, and is this single ended or differential? And what is at the receiving end of the cable? Typically, there is an SDI adaptive cable equalizer (such as the LMH0344, LMH0384, or LMH0394) at...
    on Aug 6, 2012

  • Forum Post: RE: LMH0307 termination

    Gary Melchior
    I would recommend using an R REF resistor of 953 ohms for this application. With 50 ohm output pullup resistors, the LMH0307 will drive an 800 mV P-P differential signal into the cable. Assuming there are no other losses in the data path (besides the cable), this is the ideal launch amplitude to allow...
    on Aug 7, 2012

  • Forum Post: LMH0387 IBIS Model

    Cliff Yeh
    Hi, I would like to do the PCB simulation with LMH0387(3G-SDI), but I can't find the IBIS model of LMH0387 on the TI web. I have an idea that merged LMH0344(3G-SDI Cable EQ) & LMH0302(3G-SDI Cable Driver) pin definition and LMH0387 package data. But, I not sure that can work well. ...
    on Apr 17, 2012

  • Forum Post: LMH0001 and LMH0074 for differential cable transmission.

    Kawai
    I have been reading the similar design information listed in this forum post. http://e2e.ti.com/support/interface/high_speed_interface/f/138/p/206106/730943.aspx#730943 As I still cannot understand, please tell me how to design LMH0001 and LMH0074 for differential cable transmission. 1) What is the recommendation...
    on Oct 15, 2012

  • Forum Post: RE: LMH0031 I/O port configuration

    Gary Melchior
    The H and V bits are output following the successful decoding of the TRS character string. The H-bit is 1 to indicate the EAV sequence, and 0 to indicate the SAV sequence. This bit is 1 between EAV and SAV (during horizontal blanking), and 0 during active video. The V-bit is 1 in the vertical blanking...
    on Nov 28, 2012

  • Forum Post: Problem with 3G-SDI RX

    Suresha N S
    Hi , We are using LMH0303 & LMH0344 in the TX and RX paths of SDI respectively. SDI TX is working without any issues for all modes (SD-SDI , HD-SDI , 3G-SDI & Dual stream SDI ). We have verified this using SDI Monitor. Although SDI RX is working fine for SD-SDI & HD-SDI , we are facing...
    on Jan 11, 2013
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