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LMH6553: Connection of differential output to single-ended input

Nobuhiko Wasa
Intellectual 1070 points
Part Number: LMH6553


Team,

My customer is considering to separate the output of differential amplifier by connecting each of differential output to single-end input of next differential amplifier, like following diagram.

As an example, when LNH6553 is considered, what should customer need to care about? Customer may set different gain for each of 2nd stage amplifier.

Regards,
Nobuhiko Wasa

  • 0
    TI__Genius 17745 points

    Hi Nobuhiko,

    The same considerations for a regular FDA apply to this configuration. Proper input termination whether differential or single ended must be considered. The matching of resistors in your feedback branches of each amplifier is also key. Another consideration is making sure each output of the first FDA is seeing the same impedance. I will attach a reference design with an FDA cascaded with a VGA. The circuit is not exactly like the customer circuit, but the general ideas apply.

    Cascaded LMH5401 and LMH6401 Reference Design (ti.com)

    Best Regards,

    Ignacio