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LME49810 mute current

Gene Mirro
Prodigy 160 points

http://www.ti.com/lit/ds/symlink/lme49810.pdf

On page 5 of the spec sheet, it says "Current into mute pin to activate the amplifer:  50-200uA.  What does that mean?  Does it mean that 200uA may be required by some units?  Or does it mean that I am allowed to apply 200uA to the mute pin without damage?

In Figure 5, it shows 5V/(33K + 10K) = 116uA being applied.

On page 13, it says that more than 200uA might damage the chip.  

Should I assume that 116uA is enough?  Thanks for your assistance.

  • 0
    TI__Intellectual 1240 points

    Hi Gene-san,

    I'll make some comment to your question.

    To activate the LME49810, you need to supply 50uA min, 100uA typ, and 200uA max.  The calculation of Im is shown on pg11. Please refer to caliculation formula (1). The range of Im should be within 50uA to 200uA. 116uA of Im is good enough to activate the LME49810.

    Best regards

    T NAOKAWA

  • 0 in reply to Toyojiro Naokawa
    Prodigy 20 points

    Hello,

    Please let me know this mute pin is related to short circuit protection?

    Regards,

    Stephan

  • 0 in reply to Stephan Sch
    TI__Intellectual 1240 points

    Hello Stephan-san,

    The Mute pin doesn't relate to Short circuit protection. LME49810 has 2 Gm stages on the input stage. One Gm stage has IN+ and IN- Input pins for signal pass but Gm for Mute has Osense pin. This Osense pin is connected to Amplifier Output as shown on the pg2 typical application circuit to keep GND level potential in Mute mode. The Gms stage will be switched by Mute pin. Foe enabling the amplifier, you need to feed more than 50uA into Mute pin and to Mute the amplifier, you need to reduce the Mute pin input current as shown on Pg9 fig24.

    Hope this helps for your question.

    Best regards

    T NAOKAWA