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DS160PR410: Noise output when there is no Input

Joseph George
Prodigy 120 points
Part Number: DS160PR410

Hi,
We are designing DS160PR410 in our new design.
But we are facing one issue, When there is no any input, we are getting a 150mV noise at the output of the DS160PR410.
Our Supply and decoupling is proper.(we tried different powering methods to confirm the same). So is there is any method to decrease noise less than 50mV at the output.
Thanks
Joseph George

  • 0
    TI__Guru* 93670 points

    Hi George,

    PR410 is a wide band linear analog amplifier. Also, when it is powered up it is looking for termination on it's output before turning on termination on its own RX side. In other words, once powered up it is operational and there is no signal detect to mute and reduce noise on its outputs. To reduce output noise, when there is no incoming signal, first it would be good to reduce EQ and DC gain as low as possible(if this is applicable). Also perhaps channel can be powered down as well. However, once there is signal then these need to be restored back. 

    Also, is it possible this noise is coming from the source driving PR410 input and we are just amplifying it?

    Another thought is that i am wondering if your differential traces are matched? Otherwise we maybe amplifying the common mode noise. 

    Regards,, nasser