ADV7612 and ADV7511 reference design questions

HEllo,

We’re designing Altera mezzanine cards with the ADV7511 and ADV7612 parts. On the ADI reference design, they us fairly large EMI filters on each of the supply lines. These filters are something of a mechanical problem. We’d like to place the regulation on the bottom of the board and use top and bottom ground planes for EMI isolation from the 7511 and 7612 and simply filter each supply line through a PI filter with 10uH inductor in it. Can you check and see if this will be adequate?

 

The datasheets claim these parts are very sensitive to supply ripple. Should I model my filters?

THank you,

Frank

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  • Hello, Guenter!

    Please explain what is the difference between ADV7612 and ADV7511 power supply requirements?

    Why on EVAL-ADV7612-7511 board power supplies for ADV7612 and ADV7511 are also different?

    1). Why for ADV7612 1.8V and 3.3V power supplies LDOs with fixed voltage and soft-start ( ADP1715-1.8 and  ADP1715-3.3 ) are used, but for ADV7511 1.8V and 3.3V power supplies LDOs with adjusted voltage and without soft-start ( ADP123-ADJ ) are used?

    Note: fixed voltage versions of ADP123-ADJ exist in the same LDO family: ADP122-1.8 and ADP122-3.3.

    2). Why for ADV7511 power supply EMC filters are used with follow-up Panasonic ELJ-FC100KF 10uH inductors, but for ADV7612 power supply EMC filters are used without inductors?

Reply
  • Hello, Guenter!

    Please explain what is the difference between ADV7612 and ADV7511 power supply requirements?

    Why on EVAL-ADV7612-7511 board power supplies for ADV7612 and ADV7511 are also different?

    1). Why for ADV7612 1.8V and 3.3V power supplies LDOs with fixed voltage and soft-start ( ADP1715-1.8 and  ADP1715-3.3 ) are used, but for ADV7511 1.8V and 3.3V power supplies LDOs with adjusted voltage and without soft-start ( ADP123-ADJ ) are used?

    Note: fixed voltage versions of ADP123-ADJ exist in the same LDO family: ADP122-1.8 and ADP122-3.3.

    2). Why for ADV7511 power supply EMC filters are used with follow-up Panasonic ELJ-FC100KF 10uH inductors, but for ADV7612 power supply EMC filters are used without inductors?

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