• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 33 subscribers
  • Views 1275 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMH1980: Difference between device family

Ryan.Bishop
Expert 3900 points
Part Number: LMH1980
Other Parts Discussed in Thread: LMH1981, LM1881

Hello,

What is the main difference between LMH1980 and LMH1981 function wise and electrical wise? From my understanding, the customer can utilize these two parts for video genlock purpose and if they only use HSOUT/VSOUT/OEOUT, then the two parts are interchangeable (although not pin2pin).

Is this correct or am I missing something? Thank you!

Regards,

Ryan B.

  • 0
    TI__Expert 5370 points
    Hello Ryan,

    The main difference between these two devices is the packaging. One is smaller so if form factor is key the 1980 is likely a better choice.

    Regards, Simon.
  • 0 in reply to Simon Damphousse
    TI__Expert 3900 points
    Hi Simon,

    Thanks for your answer. I was comparing the datasheets between the two devices, and it seems that the LMH1981 has improved jitter performance on the HSync signal. It's mentioned repeatedly in the datasheet, while not in the LMH1980 datasheet.

    LMH1981 Datasheet: "HSync features very low jitter on its leading (falling) edge, minimizing external circuitry needed to clean and reduce jitter in of HSync subsequent clock generation stages."

    AN-1681 App Note: "This application report discusses the LMH1980’s advantages over the LM1881 and considerations for designing the LMH1980 into current LM1881 sockets. In broadcast and professional video systems where timing jitter is a critical system parameter, another sync separator, the LMH1981, offers the best jitter performance while supporting all SD and HD analog video standards."

    Do we have any information comparing this improved jitter on the LMH1981 compared to the LMH1980?

    Thank you!
    Ryan B.
  • 0 in reply to Ryan.Bishop
    TI__Expert 5370 points
    Dear Ryan,

    I do not and due to age of these devices, do not have access to design team .

    Regards, Simon.