LMH1981: NTSC(BB)tdHSOUT min-max

user4449052

Part Number: LMH1981

I have a question about LMH1981.

The datasheet only shows the typical value for the HSOUT swing (tdHSOUT) at NTSC (BB) input.
Please let me know the maximum and minimum values.

The output is connected to the FPGA, and I observed that there is a maximum difference of 400ns.

over 3 years ago

0 Noel Fung over 3 years ago

TI__Guru* 92280 points

Hi There,

I am not sure whether we have the min. and max. value but a variation of 400ns does not make sense to me as the typical values are just around 40ns. As shown in datasheet figure 13 and 14, the jitter is in ps range.

0 user4449052 over 3 years ago in reply to Noel Fung

Prodigy 160 points

Hi,

I want to know the maximum value of tdHSOUT in Table 1.
There is only a typical value of 40ns listed.

Regards,

0 Noel Fung over 3 years ago in reply to user4449052

TI__Guru* 92280 points

Hi There,

I will have to check with the team to see if we have this data or not, this may take a while, stay tuned.

0 Noel Fung over 3 years ago in reply to Noel Fung

TI__Guru* 92280 points

Hi There,

I have checked this out, but unfortunately, we don't have the min. and max. value. BTW, the timing of the falling edge of the H-sync is trimmed in production, so it is not likely that the delay time is over 400ns.

I am not familiar with video application, could your problem be due to poor input video quality or due to something highlighted in the datasheet section "Optional Considerations" on page 17?

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LMH1981: NTSC(BB)tdHSOUT min-max