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DRV632 !MUTE vs DRV603 EN

Bob Johnson2
Prodigy 20 points
Other Parts Discussed in Thread: DRV632, DRV603

The DRV632 has a !MUTE (active low) pin which puts the output in a low-impedance state when muted. The DRV632 datasheet specs Zo, the output impedance when muted, as 110mOhms. The DRV603 has an ENable input (active high) which enables the driver output. However, what I can't find in the DRV603 datasheet is any indication of the output state when it is disabled (EN low). Does the EN pin of the DRV603 put the output in a low-impedance state with a Zo similar to the DRV632 (ie equivalent to !MUTE), or does it go to a high-impedance state? I'm not seeing any specification in the datasheet that confirms the output state when disabled. Thanks for clarifying this and/or pointing me to the relevant page in the datasheet.

  • 0
    TI__Guru**** 189401 points

    Hi, Bob,

    Welcome to e2e, and thanks for your interest in our products!

    I have asked my colleague to look into this for you; it might take us a few days to scare up an answer.

    -d2

  • 0 in reply to Don Dapkus
    TI__Expert 7815 points

    Hi Bob,

     

    I'm looking into this for you and will let you know as soon as I find out.

     

    Regards,

     

    Brian Wang

  • 0 in reply to Brian Wang
    TI__Expert 7815 points

    Hi Bob,

     

    I too do not see information on the output impedance for the DRV603 when disabled. There's a difference between the two parts though, between the mute function of the DRV632 and the enable/disable function of the DRV603 (below)

     

    Just like you were thinking, instead of the low impedance in the mute method, the DRV603 has the whole amp disabled and gives a high impedance output. As a reference, the DRV603 EVM has an output impedance of 99 Ohms when EN pin is pulled low. Hope this answers your question! Let me know if anything else.

     

    Regards,

     

    Brian Wang

  • 0 in reply to Brian Wang
    Prodigy 20 points

    Thank you. That does indeed answer my question, or rather, confirm my suspicion. Figure 11 in the data sheet (the one you posted) is somewhat misleading IMO, as it implies that the DRV603 Enable works like the conventional circuit Enable, which basically grounds the output in the disabled state. This is usually preferable, as a high impedance disabled output is prone to oscillation and noise pickup if connected to long (high capacitance) output cables. I suspect this is why the DRV632--which appears to be a newer almost-pin-compatible part but with different specs--now has a !MUTE input and not an Enable.

    BTW, if you do revise the data sheet for the DRV603 someday, note that the PW Package (Top View) pin 14 should be +INL, not +IN. Also, on the DRV632 data sheet, the Application Circuit diagram should show !MUTE for pin 5, not EN.

  • 0 in reply to Bob Johnson2
    TI__Expert 7815 points

    Hi Bob,

     

    Great catch! Thanks for spotting that for us, I'll definitely send this in for revision.

     

    Regards,

     

    Brian Wang