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LM6144 Amplifier Layout Concerns

Intellectual 370 points

Replies: 2

Views: 246

Good afternoon,


I am reviewing a layout for a flight board at NASA Goddard.  The design engineer has incorporated several instances of the LM6144, the datasheet does not mention much in terms of any layout concerns.  However, since the GBWP is 17MHz I would think that some caution should be employed when considering an adequate decoupling strategy as well as keeping the ground planes away from the I/O pins.  Has anyone worked with this part?  Are there any app notes or other literature aside from the datasheets attached to the part?  I performed a few searches and came up empty. 

Any help would be much appreciated!  Thanks for your time.

Dave Durachka

2 Replies

  • Hi David,

    The LM6144 is a well behaved medium-speed device. No real special precautions above the normal best practices of keeping the circuit compact (short traces, components close) and good supply bypassing to a solid ground.

    Bypassing should be a 0.1uF ceramic cap at the supply pins and a 4.7uF or larger near by.

    Ground planes can be good or bad. They are good as they provide shielding, but can be bad as they can increase parasitic capacitance to the feedback components. It is up to the designer if they prefer noise pickup/radiation over stray capacitance.

    You may be interested in the following section from chapter 17 of Op-Amps for Everyone:

     http://www.ti.com/lit/ml/sloa089/sloa089.pdf

    Regards,

    Regards,

    Paul Grohe

    TI Comparators (CMPS) Applications Group

  • Oops.. The link should be:

    www.ti.com/.../sloa089.pdf

    (corrected on-line)

    Regards,

    Regards,

    Paul Grohe

    TI Comparators (CMPS) Applications Group

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