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LME49724: Driving a single ended single supply LME49724 with a single supply LME49726

Rod Sabick19
Prodigy 10 points
Part Number: LME49724
Other Parts Discussed in Thread: LME49726
I have a LME49726 output that I need to interface to the non-inverting input of a LME49724 that are both also operating on the same 5 volt supply.
The LME49724 is configured with a single ended input per figure 51 of the data sheet.
LME49726 is outputing voice band audio to the LME49724.  The LME49724 is driving a 600 ohm balanced audio input.
The LME49726 output is biased at 2.5 volts. It appears that per the LME49724 circuit shown in figure 51, I need a voltage source referenced to ground.
Please help / advise.
  • 0
    TI__Mastermind 20085 points
    Hello Rob,

    Welcome to E2E, thanks for your interest in our products.
    One of my colleagues will be responding soon with further information.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0
    TI__Guru* 95335 points
    Hi Rod,

    Is my understanding correct that you ask about how to interface LME49726 output with LME49724 SE input?
    As you said, LME49726 is a single-ended and in a single supply operation it will be biased to mid-supply. You must place a series capacitor between LME49726 output and LME49724 input. This is called "AC coupling" were the DC component is removed from the signal.

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