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LMH6570: LMH6570

Part Number: LMH6570
Other Parts Discussed in Thread: OPA875, OPA4872

Hello,

I am looking for the spice model for the LMH6570.

Any body has it?

Regards,

Giora

  • Morning Giora, 

    I couldn't find a model for the LMH6570 (or the 4:1 version either). 

    There was a flurry of what I called buffered mux developmentsback in the 2006 to 2009 timeframe, The TI high speed group did a few, 

    1. the 2:1 version is the OPA875 and it does show a model in its web folder, kind of an odd .sub file, maybe someone can get that into TINA for you

    2. the 4:1 version was the OPA4872 and it has a TINA reference design, attached here - 

    0285.OPA4872 ref design.TSC

  • Hi Michael,

    Thanks.

    I am using the spice model of the OPA4872 in my simulation design.

    In the PCB I will use the LMH6570.

    What I want to know for a gain of X1.3 what resistor should I use. In the data sheet I find a graph that said to use 1k.

    I want to see what BW and pulse response it will give.

    Giora

  • There is probably no model on the horizon, but, since those R's are external in the LMH6570, you can try different values on the physical hardware

    Those 1kohm numbers seem high to me. Sometimes that is an overcomp of feedthru effects forcing the CFA to bandlimit that issue.