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High Speed Comparator (TLV3501) PCB Testing

Neel Mehta82485
Prodigy 40 points

Other Parts Discussed in Thread: TLV3501

I have made a TLV3501 PCB as mentioned in the datasheet. I want to test out the PCB before I link it up with my other PCBs. Can someone tell me what tests or equipment I should use? Note that my emphasis is on the accuracy of the PCB and check that the PCB is correct rather than the performance of the PCB.

Additional Info:

I am using this PCB in a communication circuit. It is used in linked with the AD8318 which is an RF detector. Together they detect pulses and provide with a output which is actually a stream of pulses. The pulses occur with a maximum frequency of 5 MHz.

  • 0
    TI__Genius 12375 points

    Neel,

    After assembling a PCB and properly cleaning the board to remove residues from assembly, my personal preference for initial testing is to configure the board such that the output of the part will be static (try connecting one input to ground and the other to VCC to hold the comparator in a known state) and then power the board on for the first time while keeping a close eye on quiescent current (the current the part is drawing from the power supply). Use a bench power supply that allows you to limit its output current and set the limit near the quiescent current for the part (set the limit slightly above to allow for charging of capacitors on the board). The first indicator that something is wrong (before something catches fire, smells really bad, etc.) is excessive power supply current. If the part is drawing too much current, turn off the power supply and check  the PCB for assembly issues.

    Once you've established that the part is drawing the specified level of quiescent current, I would alternately connect the two inputs to known voltages to verify that the output responds as expected, you can use a multimeter for this test, but an oscilloscope may be more useful for determining if the part is oscillating. Finally, I would configure a function generator to mimic the expected input signal from the system and view the output of the comparator on an oscilloscope to double check proper behavior. This last step may be overkill and you may chose to connect the comparator to your additional circuitry and view the output with an oscilloscope during operation.