ADAU1772 driving 8 ohm headphone

I need to drive an 8 ohm (differential) headphone with ADAU1772. Datasheet mentions specifications for headphones with impedance as low as 16 Ohms. 

Datasheet mentions headphone output power at AVDD = 3.3V for 16 Ohm load = 189.2mW (DAC differential output).

My question is, can I use 8 ohm headphone with this chip?

If yes, will I get more power using 8 Ohm headphone?

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  • 0
    •  Analog Employees 
    on Jun 1, 2017 10:44 PM

    Hello a4speaker,

    You will not find a codec that can drive an 8-ohm load. That is not a use case that is normal and it would be difficult to design and keep costs low. You will need to use an external amplifier to drive the headphones. We did just recently release a new amplifier designed to drive headphones for a high-end design. It is designed to drive a lot of current into a load but even this part only goes down to 16 ohms and 10ohms is considered a "short" in the datasheet. This is the SSM6322.

    So I suggest you ask the question to the linear amplifiers group here in the forum: https://ez.analog.com/community/amplifiers

    They are the people who know our linear product offerings a little better.

    I agree with you that using an 8-ohm resistor is somewhat wasteful and not the ideal solution.

    Thanks,

    Dave T

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  • 0
    •  Analog Employees 
    on Jun 1, 2017 10:44 PM

    Hello a4speaker,

    You will not find a codec that can drive an 8-ohm load. That is not a use case that is normal and it would be difficult to design and keep costs low. You will need to use an external amplifier to drive the headphones. We did just recently release a new amplifier designed to drive headphones for a high-end design. It is designed to drive a lot of current into a load but even this part only goes down to 16 ohms and 10ohms is considered a "short" in the datasheet. This is the SSM6322.

    So I suggest you ask the question to the linear amplifiers group here in the forum: https://ez.analog.com/community/amplifiers

    They are the people who know our linear product offerings a little better.

    I agree with you that using an 8-ohm resistor is somewhat wasteful and not the ideal solution.

    Thanks,

    Dave T

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