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TLV3544: TLV3544 output disturbance problem

Part Number: TLV3544

The appendix is my schematic diagram, Vs:5V, found the following questions:
First, the output voltage of all channels of TLV3544 is 4.5V,
When I adjusted the output voltage of channel 1 to 0V,
I found that the other three output channels fell from 4.5V to 4.4V.
What is the reason for this drop problem? How to solve this problem?

  • Hi,

    What gain configuration do you have each of the devices in? Have you verified that the input voltage to the other three channels has not changed as well?

    Thank you,

    Jacob Freet 
    High Speed Amplifiers

  • In reply to Jacob%20Freet:

    The gain of each channel is 60dB, and the input terminal is connected with the photodiode circuit.

    If we exclude the influence of input interference, can it be considered as interference caused by amplifier channel?

    Thank you

  • In reply to bunney shang:

    Hi,

    Can you tell me how the inputs are connected on the channels that are showing the gain error? At such a high gain, we are only looking for a 100uV difference at the input to cause 100mV output change. The amplifiers are usually well isolated internally especially a low/DC for the TLV3544, it has less than -100 dB channel-to-channel crosstalk at frequencies less than 1MHz.

    Regards,

    Jacob Freet 
    High Speed Amplifiers

  • Hi Bunney,

    can you post a proper schematic? With your hand drawing it's impossible to help. :-)

    Kai
  • In reply to Jacob%20Freet:

    HI,Each of the channels of the amplifier is a TIA architecture, and you think this output DC voltage disturbance is less likely due to channel interference, right? Do you think it might be the result of a change in the power supply current of the amplifier? Thanks
  • In reply to bunney shang:

    Hi Bunney,

    above you told that gain of each channel is 60dB. Now you say that each channel is a TIA. Hhm... It's difficult to help without schematic... :-)

    Kai
  • In reply to kai klaas69:

    Dears,this issue is resolved, thanks

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