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LMH0340

Debabrata Banerjee
Prodigy 20 points
Other Parts Discussed in Thread: LMH0340

I am looking at an application where I need to create a SDI output from a LVDS/HDMI Interface. I am looking for SMTPE 424M. I believe I can get SDI rates up to 2.97 GBPS which will allow 1920 x 1080 @ 60 fps. The datasheet shows a 5 bit LVDS (5 diff pairs) and the LVDS CLK which is then 8b/10b encoded to a 5:1 Mux out to SDI and it talks about a FPGA attachment. So here are my questions:

1) This device will work only with 5 LVDS pairs running at what rates?

2) Is there anyway we can use different number of LVDS pairs and increase the data rates?

3) I plan to use a single SDI interface so can the SMB be disconnected with PUZs and the configuration goes to a default setting? Is the SMB Bus a must?

4) Do we need a FPGA to drive the LVDS signals? Can it not be driven by a Controller with correct LVDS data rate?

5) Do you have a similar device to go from HDMI to SDI?

   Looking for a FAE who I can talk directly.

 

 

  • 0
    TI__Guru* 93670 points
    Hi Debabrata,

    LMH0340 is targeted for SDI applications. This device runs at SMPTE specified data rates only. LMH0340 supports SMPTE 424M, SMPTE292M, SMPTE259M, and DVB-ASI. Please refer to these specifications for further information.

    The FPGA attached to this device uses all 5 LVDS pairs to support these different SMPTE data rates. Thus all 5 LVDS pairs are used. The SMBUS interface is used to setup the registers and thus this is required.

    LMH0340 and the FPGA IP provides SMPTE required frame format so LMH0340 is always used with either Altera or Xilinx FPGA. I believe customers use FPGA for HDMI to SDI and vice versa however i am not aware of a single chip that does this coversion.

    Regards,,nasser