LTC5564: Vout voltage swing

On page 10 of the datasheet, the output swing of the high speed amplifier is noted as "approximately 295mV to VCC – 1.6V". However for instance on page 6, in the figure "VOUT vs Input Power 10GHz", Vout is shown to increase up to ~4600mV, which seems to conflict with the VCC-1.6V statement.

What is the actual range of Vout ( for VCC=3.3V and for VCC=5.0V)?

  • +1
    •  Analog Employees 
    on Jul 8, 2020 8:12 PM 9 months ago

    Hi mvgalen,

    Sorry about late response on this.

    The page 6 graph, response at 10GHz, is based on actual measurements of multiple parts with Vcc= 5V, as stated on the graph. It is correct, with the understanding that there will always be part-to-part variation which is inherent to the semiconductor mass-production process.

    The (Vcc - 1.6V) limitation happens at lower values of Vcc, as noted on datasheet page 3: Vout Output Voltage Swing for Supply Voltage = 3V is specified as 1.4V min.

    Hope that helps answer your question.


  • Hi Bruce,

    Thanks for your answer.

    Do I assume correctly that the 1.6V @ Vcc=3.0V limitation then reduces linearly to ~0.4V @ Vcc=5.0V? Meaning that the maximum Vout voltage at Vcc=3.3V is about 1.8V?



  • 0
    •  Analog Employees 
    on Jul 21, 2020 1:19 AM 8 months ago in reply to mvgalen

    Hi Marijn,

    Yes, your extrapolation theory will be roughly correct. Understand that we do not have data to show how linear (or non-linear) that curve might be. It seems safe to assume that the max VOUT for Vcc=3.3V should be around 1.8V, as you calculate.  -Bruce

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