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LME49724: Recommended resistor range for LME49724

Lorenzo Marcantonio
Prodigy 190 points
Part Number: LME49724
I'm used to see Rf/Rg resistors in the range of 10k for common operational amplifiers, but for the fully differential ones it seems that the usual values are much lower (the demo board uses 1k, in impedance matched configurations down to 250-500 ohm); is this simply because they have a lot of drive and lower resistances give less noise or there are other reasons? The 16k differential input impedance in the datasheet seems to indicate that higher values could ruin the whole virtual ground assumption! In short, is there a recommended range for the resistors tied to the amplifiers? Thanks in advance
  • 0
    TI__Guru** 109165 points
    Hi Lorenzo,

    I apologize for the delayed response on your post.
    I will take a look at your questions and will come back to you later today.

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio & Actuators
  • 0
    TI__Guru** 109165 points
    Lorenzo,

    The value of the resistors should be selected depending on your application. But generally you should use values in the order of kilo Ohm through hundreds of kilo Ohms.
    Both cases, 10k or 1k, should work fine with the device.

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio & Actuators.