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TLV3501: The issue of the input voltage range of TLV3501

Part Number: TLV3501

I see from the previous issue and find that the expert said the legal input range with a single 5V supply is +5.2V to -0.2V. I want to know where this value comes from in the datasheet.

Does it means that when I use the chip with single 5V supply(the V- connected to GND), the input voltage (sin wave) should not higher than 400mv vpp? That is I better use the level-shift circuit to shift the voltage level beyond 0V?

But the question is that the input signal is 28mv to 2.8V peak to peak, and  it is sin wave. The value of level-shift circiut is not easy to detemine .I want the output is squarewave and it's low level is 0V, it's high level is 5V. so I can measure the frequency using FPGA.

  • Noah
    We’re on holiday break today but we’ll get back to you first thing tomorrow.
    Chuck
  • Hi Noah,

    The legal input range spec comes from the "Vcm Common-mode Input Range" spec in table 6.6 (page 6) of the datasheet.

    Yes, to not violate the common mode, your sine wave signal should general be offset/level shifted above ground to fall within this spec. If your input signal goes outside this spec, the performance of the part could suffer.

    If your input signal is only 28mV to 2.8Vpp, then your signal is already within the common mode and you won't need to level shift it. What was your voltage trip point?

    Regards,
    Jonny