LMH0397: 3G SDI Level A and Level B Support

Shifali N

Part Number: LMH0397

Hi,

I am using LMH0397RTVT in my design for 3G SDI input. 3G SDI has Level A and Level B signal mapping. Please let me know if the IC supports the same.

over 4 years ago

0 Nasser Mohammadi over 4 years ago

TI__Guru* 93670 points

Hi Shifali,

Yes LMH0397 does support level A(3G data stream) and level B(multiplexed two 1.5G data streams).

Regards,, Nasser

0 Shifali N over 4 years ago in reply to Nasser Mohammadi

Expert 2145 points

Hi,

Is there any schematics or design changes required for Level A and Level B. I'm unaware how the switching from Level A to Level B is done. Does anything have to be taken care during design of this cable driver.

0 Nasser Mohammadi over 4 years ago in reply to Shifali N

TI__Guru* 93670 points

Greetings,

Schematic is the same for level A and B both on the equalizer and cable driver sides. Video frame structure is different between these two levels.

Regards ,,Nasser

0 Shifali N over 4 years ago in reply to Nasser Mohammadi

Expert 2145 points

Hi,

How does the IC take care of Level A and Level B. Does it take care through I2C or any register bit change.

How will the IC get to know.

0 Nasser Mohammadi over 4 years ago in reply to Shifali N

TI__Guru* 93670 points

Hi Shifali,

LMH0397 does not know if there is level A or B going through the part. LMH0397 cleans up the jitter and performs 75-ohm to 100-ohm conversion and vice versa. LMH0397 does not encode or decode video frame going through the device.

Regards,, Nasser

0 Shifali N over 4 years ago in reply to Nasser Mohammadi

Expert 2145 points

Hi,

Could you please let me know where exactly the Level A and Level B comes into picture, if its not dependent on IC

0 Nasser Mohammadi over 4 years ago in reply to Shifali N

TI__Guru* 93670 points

Hi Shifali,

It is coming from FPGA or video processor driving LMH0397 device. Please note figure 20 of the LMH0397 data sheet.

Regards,, Nasser

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LMH0397: 3G SDI Level A and Level B Support