TLV9001: TLV9001

Hadi Shvartz

Part Number: TLV9001

Tool/software:

Hi,

I would like to connect speaker as microphone , and i will need to connect op amp in differential connection with 24dB gain, please note that the speaker also connected in parallel to the audio PA that generate 30Vrms with 400Wrms , so i can have scenario that the audio PA will drive the speaker and i will have on the op amp input 30vrms.

Could you recommend how can i protect the inputs of the TLV9001, please note that i will use a single supply 5V for the Op amp

Thanks Hadi

7 months ago

0 Ron Michallick 7 months ago

TI__Guru**** 164426 points

Hello Hadi,

Make C1, C3 at least 50V for the isolation , common mode voltage.

This circuit is lightly tested. Feel free to test it more or make changes.

TLV9001 speaker mic.TSC

0 Hadi Shvartz 7 months ago in reply to Ron Michallick

Prodigy 90 points

Thanks Ron,

Just for the verification the diode will not impact on VREF point of the amplifier(1/2VDD), because 2.5V DC will cause to the diode to conduct and the DC REF voltage will be ~1V on the OPAMP+ input

0 Ron Michallick 7 months ago in reply to Hadi Shvartz

TI__Guru**** 164426 points

Hadi,

With negative feedback (R3, C2) the out tries to drive both inputs to the same voltage (until OUT hits it voltage swing limits)

So diodes have no bias. With no AC input, IN+ = IN- = OUT = 2.5V

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TLV9001: TLV9001