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TS12A12511: -3dB bandwidth of TS12A12511

Kailyn Chen
Genius 9560 points
Part Number: TS12A12511

Dear engineer;

The datasheet provide the "Frequency VS magnitude" curve, and the -3dB bandwidth could get to 93MHz. But there is one customer who test it and the -3dB bandwidth is much less than 93Mhz, please refer the result he tested.

Best regards

Kailyn

  • 0
    TI__Mastermind 21805 points

    Hello Kailyn,

    The behavior your client is experiencing definitely deviates from what is expected based on the datasheet.  One potential reason could be improper calibration, or neglecting to account for the bandwidth of the board and its contribution on reflections and transmission.  Did your client simply do a eCal or a 2 port calibration on the leads connecting to the board?  Or did he/she do the 2 port calibration as shown in the figure below?

  • 0 in reply to Patrick Simmons
    TI__Genius 9560 points

    Hello;

     Thank you very much for your reply.Below is the reply of our customer:

     PCB design is as below, only mechical relay or TS12A12511 is on PCB when it is tested.

    When TS12A12511 is removed and a mechanical relay is used, at the same test points and same test conditions and instruments, the 2 diagrams as below . The testing wires  by jumping are not perfect, but TS12A12511 has much too  poor performance and dose not match its datasheet.

    TS12A12511.zip

     

  • 0 in reply to Kailyn Chen
    TI__Mastermind 21805 points

    Hello Kailyn,

    Thank you for providing your test measurements of the board and bringing this issue to light, we will investigate further into this behavior and determine whether our parts are really not performing to the datasheet specifications.  As the chips are not readily on-hand this may take a few days.

  • 0 in reply to Patrick Simmons
    TI__Mastermind 45350 points

    Kailyn,

    I went and made a very crude board in the lab to double check the TS12A12511 bandwidth is close to the datasheet value. 

    The measurement below was taken from NO to COM with Vcc = 12V, V-=GND, and IN= 12 V.  You can see the curve isn't very smooth due to the crude board set up but we are able to get >150MHz performance out of the device. 

    I'm not sure if I understand your measurement above as there seems to be a lot of parasitic inductance after 75 MHz in your measurement with the curve sloping up.  I would expect the TS12A12511 to have parasitic capacitance performance with a down sloping curve across these frequencies. 

     

    Here is an appnote on high speed layout guidelines to help your system achieve the best performance. 

    Thank you,

    Adam