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SN10501: Question about sn10501dbvr

Jimmy Huang
Expert 2205 points
Part Number: SN10501

Hello:

The material model used by the customer is sn10501dbvr

The application circuit is shown in the figure

The oscilloscope waveform is as follows:,

The blue is the input of pin 3 of the operational amplifier, and the yellow is the output of pin 1. Sometimes a small burr appears on the output of pin 1. The customer cannot understand this output, and the power supply is normal at the same time

Please take a look at the output of pin 1. Sometimes there is a small burr. Thank you!!!

  • 0
    TI__Mastermind 22340 points

    Hello Jimmy,

       Does small blur refer to the highlighted issue (in the red box) below:

         

      What is the green waveform? 

    Thank you,
    Sima 

  • 0 in reply to SimaJalaleddine
    Expert 2205 points

    Hello:

    Yellow is the output waveform,The blue is the input of pin 3 of the op amp, the yellow is the output of pin 1, and the Yellow waveform at the red box is abnormal

    The green waveform is another waveform, which is the output waveform after the Yellow waveform enters the D flip-flop. It has nothing to do with my problem

  • 0 in reply to Jimmy Huang
    Guru 140200 points

    Hi Jimmy,

    I see two issues:

    1. The pseudoground generation arround the 510R resistors looks unusual. Normally the 1k input resistance is way bigger (at least ten times) than the 510R voltage divider resistors. This prevents that the input resistance changes all too much with frequency when the 1µF filtering cap in parallel to the 510R resistor comes into play.

    So my first idea is to remove the 1µF cap for a test and/or to use the pseudoground generation method shown in the datasheet.

    2. It's never a good idea to drive the output of a HF-OPAmp into hard saturation, especially not if AC coupling and a pseudoground is used. I would decrease the gain and/or the input signal to prevent the output voltage from going into hard saturation.

    By the way, the SN10501 is not built to operate well when being driven into hard saturation. It's built for operation well within its linear operating range. You can see this from the fact that no overload recovery time is specified in the datasheet.

    Kai