[urgent] DAC to drive headphones

Discussion in 'General Electronics Chat' started by skyjeff185, Feb 14, 2007.

  1. skyjeff185

    Thread Starter Member

    Jan 27, 2007
    13
    0
    Sorry. Maybe this is a newbie question. I have seen lots of mp3 player projects using direct output of DAC to drive headphones. But does the DAC provide enough power to drive the speakers? Or do i have to amp the DAC output and then drive the speaker.
     
  2. Papabravo

    Expert

    Feb 24, 2006
    9,900
    1,723
    You can regard the typical DAC as having an opamp for an output stage. Can they drive a speaker? Very weakly if at all depending on the speaker.
    A speaker is a very low impedance load, 4-16 Ohms, while headphones are in the several KOhm range.
     
  3. Distort10n

    Active Member

    Dec 25, 2006
    429
    1
    You need a DAC or CODEC that has an on chip headphone and/or speaker driver. Take a look at the TLV320DAC23 or TLV320AIC23B.

    You could use a DAC and then use a stand alone audio op-amp that can handle a speaker load of 4-16 ohms. I have seen headphone impedances range from 64 ohms and above. Read the spec sheet!
     
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