Low power (2v 1mA ) balanced / MC / dynamic mic pre-amp

We must put together a single channel low-voltage balanced mic  compatible preamplifier in order to interface a dynamic/balanced/moving coil mic  to a host circuit that has been designed to connect to 2-wire 'phantom' powered  electret capsule (ECM)

My circuit must operate on the small power that  the host would otherwise provide to the ECM. This is circa 1.5 - 2.1v via 1k8 so  my dynamic mic pre-amp will need to be quite low power.

I am considering modified configurations of ECM fet amplifier configurations but would like, if possible, to respect the microphone balanced line, though this is not essential?
Spacial constraints are making the use of an audio transformer problematic, though not impossible should there be a compelling reason to go this route.
Any suggestions?
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    •  Analog Employees 
    on Mar 4, 2011 11:24 PM

    Hi!

    I would look at the AD8515. This part does a good job of balancing low supply current, low voltage operation and low noise. Since it is a standard op amp, you will need to drive a transformer to create a balanced signal from the single-ended output of the AD8515. I am not aware of any differential line drivers in our product line that will operate below 2.7 V.

    Best regards,

    Coleman

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  • 0
    •  Analog Employees 
    on Mar 4, 2011 11:24 PM

    Hi!

    I would look at the AD8515. This part does a good job of balancing low supply current, low voltage operation and low noise. Since it is a standard op amp, you will need to drive a transformer to create a balanced signal from the single-ended output of the AD8515. I am not aware of any differential line drivers in our product line that will operate below 2.7 V.

    Best regards,

    Coleman

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