Is there any info on harmonic distortion introduced by the ADG604 analog mux?

ditto

  • 0
    •  Analog Employees 
    on Apr 25, 2017 1:01 AM over 3 years ago

    Hi Jjlarkin,

    Unfortunately there are no available harmonic distortion info/data for the ADG604. This is an old part and harmonic distortion was not characterized before.

    May I know the application on how you would want to use ADG604?

    Best Regards,

    May

  • I know this is rather old thread, but I plan to use ADG604 in one project and I needed to know its distortion too, so I measured it with Audio Precision APX525. It's basically a network analyzer, except it's designed specifically for audio applications. I used these conditions during measurement:

    -Symmetrical supply voltage +-5 V, sourced from Agilent E3630A
    -ADG604 soldered on SMD breakout board which was then then inserted into standard solderless breadboard
    -2x 100 nF decoupling capacitors
    -Unbalanced output and input (BNC connectors) used on APX525
    -Output connected to S1 pin, input connected to D pin of ADG604
    -Output impedance 20 ohm
    -Input impedance 100 kohm
    -Input bandwidth 90 kHz (APX525 maximum, it's an audio analyzer)

    First I measured THD vs. frequency from 20 Hz to 80 kHz, source level was 1 Vrms (my project will use this level). THD was under 0.02% in the entire band. I didn't find any way how to directly attach images in this forum, so here is link to Imgur:

    https://imgur.com/a/etgQ55L

    Then I measured THD vs. input level, first for 1 kHz and then for 40 kHz. The input level was sweeped from 1 mVrms to 6.3 Vrms. I'm attaching the results below, distortion is under 0,02% up to 3.5 Vrms at 1 kHz. It gets worse at 40 kHz, but keep in mind that 40 kHz is at the usable limit of the instrument, it can't process any harmonics beyond 90 kHz. Overally, i consider that a great result (at least for my project).

    THD Ratio vs level at 1 kHz:

    https://imgur.com/a/NeAsE0I

    THD Ratio vs level at 40 kHz:

    https://imgur.com/a/vh7K7D2

    Hopefully, someone will these measurements useful...