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Enable Function for OPA1632 Driving TAS5630

Other Parts Discussed in Thread: TAS5630, OPA1632, DRV604, DRV603

HI,

I've been reading the posts about the turn on sequence for the TAS5630 and have a question.

Can I use the ENABLE pin on the OPA1632 as a mute during the power up sequence? The OPA1632 has a +12 volt supply and VCOM open.

1) Connect the audio source to the inputs with the audio source stopped.

2) Apply VDD, GVDD and PVDD.

3) Release /RESET

4) Wait for READY high.

5) Apply audio.

I'm worried that if the outputs of the OPA1632 go to ground when ENABLE is low, that when ENABLE goes high that TAS5630 input coupling capacitors will overdrive the inputs to 6 volts momentarily and damage the TAS5630.

Or am I lucky and the outputs go to VCOM?

Thank you,

Lowell

  • Lowell

    you are looking for a way to MUTE the signal, the OPA1632 have a Enable pin, where it enteres a power down mode - comming out of the power down mode could give you some click & pop issues - i havent checked but suspect so.

    what about looking at devices like the DRV603 or DRV604, they are designed to be click & pop free when enabled/disabled. The DRV604 contains 4 opamps and can easily drive the input of TAS5630 and be configured as a stereo differential to differential driver or as a single ended to differential driver. driving the high input impedance of TAS5630 the DRV604 also has low THD and a output noise lower than the TAS5630 input refered noise.

    best regards

    Kim N Madsen 

     

  • Hi Kim,

    Thank you for your prompt response. I'm not using the TAS5630 in an audio application, so I'm not concerned about click & pop issues.

    The data sheet for the OPA1632 says that the output stage is disabled during shutdown, but that it is not in a high-impedance state. Do you know if the outputs are at VCOM, V- or they not defined?

    Thank you,

    Lowell Bohn

  • Lowell

    No sorry I do not support the OPA1632, please post your question in the high speed amplifier forum.

    i shortly looked at the THD4521, and it seemed to be better specked for enable/disable transients

     

    Kim