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TLV3801EVM: I followed the instructions to power up the chip, but IN sense could detect the signal I input, but out did not output a signal。

luo yongshi
Prodigy 10 points
Part Number: TLV3801EVM
Other Parts Discussed in Thread: TLV3801

Tool/software:

Hello, TI engineer.I followed the instructions to power up the chip, but IN sense could detect the signal I input, but out did not output a signal。

I have thought about possible issues:

1.When powering up the chip, I connected the positive pole of power supply 1 that powers VEE and the negative pole of power supply 2 that powers VCC together. I don't know if this is correct or not

2.The manual mentions“Verify that cables connecting to IN1+_SENSE, OUT1+, and OUT1- are matched length and impedance.Perform any de-skewing if necessary. Set the function generator (50-Ω terminated) to produce a square wave output with 400mVpp at 10 MHz, with a 0 V DC offset. Disable the signal generator output. Connect the signal generator output to IN1+.“，

I don't know what this matching length means? But my in1+dsense has output, so why isn't out+/out - outputting? What voltage does 400mVPP refer to?

3.If my chip is broken, how can I test if my chip is broken? What caused its damage? During the process of powering up the chip, current limiting was carried out according to the instructions, and the power of the input RF signal was below -10dBm

THANKS.

  • 0
    TI__Mastermind 26110 points

    Iuo 

    sorry to hear of your struggles. 
    VCC is the positive supply and VEE is the negative supply. 
    if you reversed them, this may have damaged the device. 
    Please confirm you have them correct and measure the quiescent current to see if it matches the typical value in the datasheet. If not, it’s damaged and you will need to replace the device. 
    Chuck

  • 0 in reply to Chuck Sins
    Prodigy 10 points

    Thank you for your reply.

    I used two DC sources, with DC source 1 set to an output voltage of 2.5V and its positive pole connected to VCC; The output voltage of DC source 2 has been adjusted to 2.5V, and the negative terminal is connected to VEE to provide the -2.5V voltage specified in the manual，which I think should be consistent with your response.

    But I don't know how to connect the negative pole of DC source 1 and the positive pole of DC source 2, so I connected them together and then limited the current of the two DC sources. The sum of the currents of the two DC sources is less than 60mA, which is consistent with the instructions.
    May I ask if there are any issues with this type of circuit connection? Will it cause the chip to burn out?

  • 0 in reply to luo yongshi
    TI__Mastermind 26110 points

    The negative of src 1 and pos of src 2 need to be connected to the GND of the EVM which applies this voltage to the GND pin of tlv3801. Should be measuring in the 20mA range.